The IS-2 ( Russian : ИС-2 , sometimes romanized as JS-2 ) is a Soviet heavy tank , the second of the IS tank series named after the Soviet leader Joseph Stalin . It was developed and saw combat during World War II and saw service in other Soviet allied countries after the war.
138-549: The KV-1 was criticized by its crews for its poor mobility and the lack of a larger caliber gun than the T-34 medium tank. It was much more expensive than the T-34, without having greater combat performance. Moscow ordered some KV-1 assembly lines to shift to T-34 production, leading to fears that KV-1 production would be halted, and the SKB-2 design bureau, led by Kotin, closed. In 1942, this problem
276-627: A BergeTiger recovery vehicle. As many as three may have been built. It carried a demolition charge on a small crane on the turret in place of the main gun. It was to move up to a minefield and drop the charge, back away, and then set the charge off to clear the minefield. There is no verification of any being used in combat. Another variant was the Fahrschulpanzer VI Tiger tanks (driving school Tiger tanks). These tanks were Tigers with modified engines to run on either compressed Towngas gas (Stadtgas System) or wood gas (Holzgas System). This
414-601: A VK 45.01 (H) H1 with an 8.8 cm L/56 cannon, and a VK 45.01 (H) H2 with a 7.5 cm L/70 cannon. On 22 June 1941, Germany launched Operation Barbarossa , the invasion of the Soviet Union . The Germans encountered large numbers of Soviet T-34 medium and KV-1 heavy tanks. According to Henschel designer Erwin Aders , "There was great consternation when it was discovered that the Soviet tanks were superior to anything available to
552-507: A 16 by 18 in (410 by 460 mm) target at a range of 1,200 yards (1,100 m). Compared with the other contemporary German tank guns, the 8.8 cm KwK 36 had superior penetration to the 7.5 cm KwK 40 on the Sturmgeschütz III and Panzer IV but inferior to the 7.5 cm KwK 42 on the Panther tank under ranges of 2,500 metres. At greater ranges, the 8.8 cm KwK 36
690-470: A 3.8 kg (8.4 lb) TNT charge. The explosive power could blow off an enemy tank turret, drive sprocket and tread off the heaviest German tank even if it could not penetrate the armor. Mechanical shock and explosion was often enough to knock out enemy heavy tanks. The most recognizable disadvantage of the D-25T gun was its slow rate of fire due to the large size and weight of the shells; only one to one and
828-582: A 38 cm (15 in) rocket launcher. A tank recovery version of the Porsche Tiger I ( Bergetiger ), and one Porsche Tiger I, was issued to the 654th Heavy Tank Destroyer Battalion, which was equipped with the Ferdinand/ Elefant . In Italy, a demolition carrier version of the Tiger I without a main gun was built by maintenance crews in an effort to find a way to clear minefields. It is often misidentified as
966-496: A KV-1S hull. To accommodate the Object 237 turret, the KV-1S hull was modified, increasing the diameter of the turret ring with fillets on the sides of the hull. The radio operator was replaced with an ammunition rack for the larger 85 mm ammunition. The hull MG was then moved to the opposite side of the driver and fixed in place to be operated by the driver. From September to October 1943,
1104-562: A Model 1941 and Model 1942, both of which received minor upgrades in their service, and both of which survived the war. Romanian forces captured one KV-1 as of 1 November 1942 and one more in March 1944. Tiger I The Tiger I ( German: [ˈtiːɡɐ] ) was a German heavy tank of World War II that began operational duty in 1942 in Africa and in the Soviet Union , usually in independent heavy tank battalions . It gave
1242-572: A Panther tank angled at 30 degrees; this estimated that the A-19 gun was unable to penetrate the upper glacis plate of the Panther from any distance, could penetrate the lower glacis plate from 100 m (110 yd), could penetrate the mantlet from 500 m (550 yd) and could penetrate the front turret from 1,500 m (1,600 yd). The side armour of the Panther was comparatively weaker and could be penetrated at 3,500 m (3,800 yd) according to
1380-666: A Panzer IV and four times as much as a StuG III assault gun . Partly because of their high cost, only 1,347 Tiger I and 492 Tiger II tanks were produced. The closest counterpart to the Tiger from the United States was the M26 Pershing (around 200 deployed to the European Theater of Operations (ETO) during the war ) and the IS-2 from the USSR (about 3,800 built during the conflict). From
1518-576: A Tiger I as another German tank of the period. When the improved Tiger II began production in January 1944, the Tiger I was soon phased out. In 1943, Japan bought several specimens of German tank designs for study. A single Tiger I was apparently purchased, along with a Panther and two Panzer IIIs, but only the Panzer IIIs were actually delivered. The undelivered Tiger was loaned to the German Wehrmacht by
SECTION 10
#17328588428221656-478: A breakthrough was achieved, lighter and more mobile tanks were used for exploitation and mopping-up. The IS-2 tank first saw action in Ukraine in early 1944 and claimed to have destroyed more than forty Tigers and Elefants for the loss of only eight tanks. On the morning of 11 August 1944, the 16th Panzer Division attacked the 53rd Guards Tank Brigade reinforced by the 71st Independent Guards Heavy Tank Regiment in
1794-612: A dog the KV-1 really was". By 1942, when the Germans were fielding large numbers of long-barreled 5 cm Pak 38 and 7.5 cm Pak 40 anti-tank guns, the KV's armour was no longer impenetrable, requiring the installation of additional appliqué armour . The KV-1's side (favorable approach: 30° at 300–500 m distance), top, and turret armor could also be penetrated by the high-velocity Mk 101 30 mm cannon carried by German ground attack aircraft, such as
1932-454: A few Panzer IIIs armed with 37 mm KwK 36 L/46.5 guns. The German tank guns had neither the range nor the power of the 76 mm main gun of a KV-1, and the narrower track width of the German tanks caused them to become trapped in the swampy ground. When German forces used captured KV-1s, they were renamed as "Panzerkampfwagen KV-IA 753(r)" The Finnish forces had two KV-1s, nicknamed Klimi ,
2070-449: A fuel tank, radiator and fans) were floodable. However, this ability was found to be of limited practical value for its high cost and was removed from production lines in August 1943. As a result, only the first 495 units were fitted with this deep fording system; all later models were capable of fording water only two metres deep. The internal layout was typical of German tanks. Forward
2208-455: A half rounds per minute could be fired, initially. After some design improvements, including a semi-automatic drop breech over the previously manual screw breech, the rate of fire increased to 2–3 rounds per minute. According to other sources, the increase may have amounted to 3–4 rounds per minute. Another limitation imposed by the size of its ammunition in a relatively small vehicle was the ammunition stowage: only 28 rounds could be carried inside
2346-652: A lighter KV. The complete Object 237 was accepted into service as the IS-85 and was produced in the autumn and winter of 1943-44; they were sent to the front as of October 1943 and production of the IS-85/IS-1 was stopped by the spring of 1944 once the IS-122/IS-2 entered full-scale production. A new heavy tank design entered production late in 1943 based on the work done on the KV-13 . Because Voroshilov had fallen out of political favour,
2484-506: A separate shell and powder charge, resulting in a lower rate of fire and reduced ammunition capacity. While the 122 mm armour-piercing shell had a lower muzzle velocity than similar late German 7.5 cm and 8.8 cm guns, proving-ground tests established that the 122 mm could penetrate the frontal armour of the German Panther tank at 2500 metres and the HE shell would easily blow off
2622-501: A slow medium tank than a heavy tank), more modern tanks were already in sight. Up-arming the regular turret of the KV-1S with an 85 mm S-31 resulted in the KV-1S-85. This was rejected as it came with the unacceptable loss of a dedicated commander, reducing the turret crew to two (unlike the 3-man turret fitted to the T-34/85). However, the thinning-out of the armor called into question why
2760-465: A technical point of view, it was better than its contemporaries. Despite the low number produced, shortages in qualified crew and the considerable fuel consumption in the face of ever shrinking resources, Tigers (including Tiger IIs) destroyed at least 10,300 enemy tanks and 11,380 anti-tank guns and artillery pieces for the loss of 1,725 Tigers (including large numbers of operational and strategic losses, i.e. abandoned, broken down, etc.). Production of
2898-549: A total of 130 KV-85s were produced, before the assembly lines began to shift over. Like the KV-1S, the KV-85 served in dwindling numbers and was quickly overshadowed by the superior IS series. The Object 237 prototype, a version of the cancelled KV-13 , was accepted for production as the IS-85 heavy tank. First deliveries were made in October 1943, and the tanks went immediately into service. Production ended in January 1944. Its designation
SECTION 20
#17328588428223036-487: A varying thickness of 120 to 200 mm (4.7 to 7.9 in). The Tiger had 60 mm (2.4 in) thick hull side plates and 80 mm (3.1 in) armour on the side superstructure/sponsons, while turret sides and rear were 80 mm. The top and bottom armour was 25 mm (1 in) thick; from March 1944, the turret roof was thickened to 40 mm (1.6 in). Armour plates were mostly flat, with interlocking construction. This flat construction encouraged angling
3174-410: Is essential for the successful deployment of the Tiger, he must have a good technical training and has to keep his nerve in critical situations… The engine drove the front sprockets through a drivetrain connecting to a transmission in the front portion of the lower hull; the front sprockets had to be mounted relatively low as a result. The Krupp-designed 11-tonne turret had a hydraulic motor whose pump
3312-497: The Waffenamt-Prüfwesen 1 gave the calculated probability of perforation at range, on which various adversaries would be defeated reliably at a side angle of 30 degrees to the incoming round. The Wa Prüf report estimated that the Tiger's 88 mm gun would be capable of penetrating the differential case of an American M4 Sherman from 2,100 m (1.3 mi) and the turret front from 1,800 m (1.1 mi), but
3450-564: The A-19 122 mm gun , and the D-10 100 mm gun , which was based on a dual-purpose naval gun . The D-10 had been designed for anti-tank fire and had better armor penetration than the A-19, but the smaller caliber meant it had a less useful high explosive round. Also, the D-10 was a relatively new weapon in short supply, while there was excess production capacity for the A-19 and its ammunition. Compared to
3588-635: The German Army its first armoured fighting vehicle that mounted the 8.8 cm (3.5 in) KwK 36 gun (derived from the 8.8 cm Flak 36 , the famous "eighty-eight" feared by Allied troops). 1,347 were built between August 1942 and August 1944. After August 1944, production of the Tiger I was phased out in favour of the Tiger II . While the Tiger I has been called an outstanding design for its time, it has also been called overengineered , using expensive materials and labour-intensive production methods. In
3726-597: The Heer ." Weight increase to 45 tonnes and an increase in gun calibre to 8.8 cm (3.5 in) were ordered for it on 26 May 1941. The due date for the new prototypes was set for 20 April 1942, Adolf Hitler 's 53rd birthday. Unlike the Panther tank , the designs did not incorporate sloped armour . Porsche and Henschel submitted prototype designs, each making use of the Krupp-designed turret. They were demonstrated at Rastenburg in front of Hitler. The Henschel design
3864-516: The Henschel Hs 129 . The KV-1's 76.2 mm gun also came in for criticism. While adequate against all German tanks, it was the same gun as carried by smaller, faster, and cheaper T-34 medium tanks. In 1943, it was determined that this gun could not easily penetrate the frontal armour of the new Tiger, the first German heavy tank, one of which was captured near Leningrad . The KV-1 was also much more difficult to manufacture and thus more expensive than
4002-604: The North African campaign ) at the UK's Tank Museum is the only example restored to running order. Henschel & Sohn began the development of a large tank design in January 1937 when the Waffenamt requested Henschel to develop a Durchbruchwagen ("breakthrough vehicle") in the 30–33 tonne range. Only one prototype hull was ever built, and it was never fitted with a turret. The Durchbruchwagen I's general shape and suspension resembled
4140-628: The Panzer III , while the turret resembled the early Panzer IV C turret with the short-barrelled 7.5 cm (3.0 in) L/24 cannon. Before Durchbruchwagen I was completed, a request was issued for a heavier 30-tonne class vehicle with thicker armour, the Durchbruchwagen II, which would have had 50 mm (2.0 in) of frontal armour and mounted a Panzer IV turret with a short-barrelled (24 calibres long) 7.5 cm KwK 37 gun. The overall weight would have been 36 tonnes. Only one hull
4278-494: The Red Army . A regiment had 21 IS-2 tanks in four companies of five tanks each and one being used by the regimental commander. The special tank regiments were reserved for important attacks, often to spearhead attempts to break through fortified German positions like anti-tank defence lines and bunkers. The tanks supported infantry in the assault by destroying bunkers, buildings, dug-in weapons and engaging German armoured vehicles. Once
IS-2 - Misplaced Pages Continue
4416-540: The Sherman Firefly tank, and self-propelled guns) firing its normal APCBC ammunition, would penetrate the turret front and driver's visor plate of the Tiger out to 1,900 yards (1,700 m). When engaging targets, Tiger crews were encouraged to angle the hull to the 10:30 or 1:30 clock position (45 degrees) relative to the target, an orientation referred to as the Mahlzeit Stellung . This would maximize
4554-588: The Tiger I and Tiger II and had a lower silhouette than both. Western observers tended to criticize Soviet tanks for their lack of finish and crude construction. The Soviets argued that it was warranted, considering the need for wartime expediency and the typically short battlefield life of their tanks. Early IS-2s can be identified by the 'stepped' front hull casting with its small, opening driver's visor. The early tanks lacked gun tube travel locks or anti-aircraft-capable machine guns and had narrow mantlets. In late 1944,
4692-429: The 55 cm (22 in) disc. Klaue was acknowledged in the patent application that he had improved, it can even be traced back to British designs dating to 1904. It is unclear whether Klaue's patent ring brake was used in the Tiger brake design. The clutch-and-brake system, typical for lighter vehicles, was retained only for emergencies. Normally, steering depended on a double differential , Henschel's development of
4830-580: The 8.8 cm KwK 36 gun could pierce the T-34/76 frontal beam nose from 1,500 m (4,900 ft), and the front hull from 1500 m. A hit to the driver's hatch would force it to collapse inwards and break apart. According to the Wa Prüf 1 report, the Soviet T-34-85's upper glacis and turret front armour would be defeated between 100 and 1,400 m (0.062 and 0.870 mi) at a side angle of 30 deg, while
4968-528: The British Merritt-Brown system first encountered in the Churchill tank . The vehicle had an eight-speed gearbox, and the steering offered two fixed radii of turns on each gear, thus the Tiger had sixteen different radii of turn. In first gear, at a speed of a few km/h, the minimal turning radius was 3.44 m (11 ft 3 in). In neutral gear, the tracks could be turned in opposite directions, so
5106-574: The D-25 could penetrate the front armor of the German Panther at 2,500 m (2,700 yd) while the D-10 could do so at a maximum range of 1,500 m (1,600 yd). It was therefore considered an adequate anti-tank gun. First deliveries of IS-122s mounted with this gun were in December 1943. A Wa Pruef 1 Report dated 5 October 1944 has data on the penetration ranges of the 122 mm A-19 gun against
5244-424: The German division's anti-aircraft battalion was moved about 730 m (800 yd) behind the tank but was knocked out by the tank gunner before it could score a hit. During the night, German combat engineers attempted to destroy the tank with satchel charges and failed, despite possibly damaging the tracks. Early on the morning of 25 June, German tanks fired on the KV from the woodland while an 88 mm targeted
5382-454: The Germans during the war. All tanks in the series were heavily based on the KV-1. A KV-1 or KV-2 tank (accounts vary) advanced far behind the German lines after attacking a column of German trucks. The tank stopped on a road across soft ground and was engaged by four 50 mm anti-tank guns of the anti-tank battalion of the 6th Panzer Division . The tank was hit many times but returned fire, disabling all four guns. A heavy 8.8 cm gun of
5520-558: The IS-2's frontal armor (The Panther's 75 mm gun could penetrate the IS-2 model 1943's mantlet from 400 m (440 yd), front turret from 800 m (870 yd), and driver's front plate from 600 m (660 yd)), while the IS-2 could penetrate the Panther at ranges of 1,000 m (1,100 yd). However, in the summer of 1944, the Germans experienced a shortage of manganese and had to switch to using high-carbon steel alloyed with nickel, which made armor very brittle, especially at
5658-580: The Japanese government. Many modifications were introduced during the production run to improve automotive performance, firepower and protection. Simplification of the design was implemented, along with cuts due to raw material shortages. In 1942 alone, at least six revisions were made, starting with the removal of the Vorpanzer (frontal armour shield) from the pre-production models in April. In May, mudguards bolted onto
IS-2 - Misplaced Pages Continue
5796-466: The KV-85 tremendously, only 148 were built between August and October 1943. Soviet industry was therefore able to produce a heavy tank as well armed as the Tiger I before the end of 1943. Although the KV-85 was an excellent opponent to the Tigers and Panthers, it was a stopgap and thus was built in small numbers. Its weight had climbed up again to about 47 tons, which negated the whole point of trying to make
5934-586: The Meteor. The 501st Heavy Panzer Battalion ( sPzAbt 501 ) reported in May 1943: …Regarding the overheating engines, the HL 210 engine caused no troubles during the recent time. All occurring breakdowns resulted from the low quality of driver training. In several cases engine failures have to be put down to the missing remote engine thermometer. Five engines have reached more than 3,000 km without essential failures. A good driver
6072-610: The T-34 had a similar F-34 main gun), was built in large quantities and received frequent upgrades. When production shifted to the " Tankograd " complex in the Ural Mountains , the KV-2 was dropped. While impressive on paper, it had been designed as a slow-moving bunker-buster. It was less useful in the highly mobile, fluid warfare that developed in World War II. The turret was so heavy it was difficult to traverse on uneven terrain. Finally, it
6210-548: The T-34's 85 mm gun was estimated to penetrate the front of a Tiger between 200 and 500 m (660 and 1,640 ft) at a side angle of 30 degrees to the incoming round. Soviet testing showed that the 85 mm gun could penetrate the front of a Tiger from 1,000 m (3,000 ft) with no side angle At a side impact angle of 30 degrees the 120 mm hull armour of the Soviet IS-2 model 1943 would be defeated between 100 and 300 m (330 and 980 ft) at
6348-419: The T-34, its advantages no longer outweighed its drawbacks. Because of its initial superior performance, the KV-1 was chosen as one of the few tanks to continue being built following the Soviet reorganization of tank production. Due to the new standardization, it shared a similar engine and gun as the T-34 (the KV used a 600 hp V-2K modification of the T-34's V-2 diesel engine, and had a ZiS-5 main gun while
6486-450: The Tiger I began in August 1942 at the factory of Henschel und Sohn in Kassel , initially at a rate of 25 per month and peaking in April 1944 at 104 per month. An official document of the time stated that the first Tiger I was completed on 4 August. 1,355 had been built by August 1944, when production ceased. Deployed Tiger I's peaked at 671 on 1 July 1944. It took about twice as long to build
6624-414: The Tiger I pivoted in place. There was a steering wheel instead of either a tiller – or, as most tanks had at that time, twin braking levers – making the Tiger I's steering system easy to use, and ahead of its time. Powered turret traverse was provided by the variable speed Boehringer-Sturm L4 hydraulic motor, which was driven from the main engine by a secondary drive shaft. On early production versions of
6762-458: The Tiger I's suspension, providing a high uniform distribution of the load onto the track, at the cost of increased maintenance. Removing an inner wheel that had lost its solid rubber tire (a common occurrence) required the removal of up to nine other wheels first. During the rainy period that brought on the autumn rasputitsa mud season and onwards into the winter conditions on the Eastern front ,
6900-481: The Tiger hull roughly 30-45° when firing in order to increase effective thickness. The 56-calibre long 8.8 cm KwK 36 was chosen for the Tiger. A combination of a flat trajectory from the high muzzle velocity and precision from the Leitz Turmzielfernrohr TZF 9b sight (later replaced by the monocular TZF 9c) made it very accurate. In British wartime firing trials, five successive hits were scored on
7038-449: The Tiger maximum turret traverse was limited to 6 degrees per second, whilst on later versions a selectable high speed traverse gear was added. Thus, the turret could be rotated 360 degrees at up to 6 degrees per second in low gear independent of engine rpm (same as on early production versions), or up to 19 degrees per second with the high-speed setting and engine at 2,000 rpm, and at over 36 degrees per second at
SECTION 50
#17328588428227176-461: The Tiger's 88 mm gun would not penetrate the upper glacis plate at any range assuming a side angle of 30 degrees. The M4 Sherman's 75 mm gun would not penetrate the Tiger frontally at any range, and needed to be within 100 m (300 ft) to achieve a side penetration against the 80 mm upper hull superstructure. The Sherman's upgraded 76 mm gun might penetrate the Tiger's driver's front plate from 600 m (2,000 ft),
7314-408: The Tiger, the tracks were 725 mm (28.5 in) wide. To meet rail-freight size restrictions , narrower 520 mm (20 in) wide 'transport' tracks ( Verladeketten ) could be installed. For Tigers equipped with rubber-tired wheels, this also required the outermost roadwheel on each axle (16 total) to be removed. The track replacement and wheel removal took 30 minutes for each side of
7452-568: The antitank guns until they had fired the first shot. We were often hit right away, if the antitank crew was on top of things, because we had run into a wall of antitank guns. It was then advisable to keep as cool as possible and take care of the enemy, before the second aimed shot was fired. Eager to make use of the powerful new weapon, Hitler ordered the vehicle be pressed into service months earlier than had been planned. A platoon of four Tigers went into action on 23 September 1942 near Leningrad . Operating in swampy, forested terrain, their movement
7590-506: The armour had high hardness and resisted penetration better than steel, it was also quite brittle and thus at risk of shattering. The IS-122 prototype replaced the IS-85 and began mass production as the IS-2. The 85 mm guns could be reserved for the new T-34-85 medium tank and some of the IS-1s built were rearmed before leaving the factory and issued as IS-2s. It was slightly lighter and faster than
7728-627: The battle, the crew of No. 864 counted a total of 135 hits on their tank, none of which had penetrated the KV-1's armour. Lieutenant Kolobanov was awarded the Order of Lenin , while his Gunner Usov was awarded the Order of the Red Banner . Later, former Captain Zinoviy Kolobanov was again decorated by Soviet authorities, despite having been convicted and downgraded after the Winter War for "fraternizing with
7866-811: The contract was awarded to Henschel, they were used for a new turretless, casemate -style tank destroyer ; 91 hulls were converted into the Panzerjäger Tiger (P) in early 1943. The Tiger was still at the prototype stage when it was first hurried into service, and therefore changes both large and small were made throughout the production run. A redesigned turret with a lower cupola was the most significant change. The river-fording submersion capability and an external air-filtration system were dropped to cut costs. The Tiger differed from earlier German tanks principally in its design philosophy. Its predecessors balanced mobility, armour and firepower and were sometimes outgunned by their opponents. While heavy, this tank
8004-655: The designer to install heavy frontal and turret armour while keeping the weight within manageable limits. The KV was ordered right off the drawing board. When the Soviets entered the Winter War , the SMK, KV and a third design, the T-100 , were sent to be tested in combat conditions. The KV outperformed the SMK and T-100 designs. The KV's heavy armour proved highly resistant to Finnish anti-tank weapons, making it more difficult to stop. In 1939,
8142-409: The destruction of other tanks counted as a success. On the other hand, antitank guns counted twice as much to the experienced tanker. They were much more dangerous to us. The antitank cannon waited in ambush, well camouflaged, and magnificently set up in the terrain. Because of that, it was very difficult to identify. It was also very difficult to hit because of its low height. Usually, we didn't make out
8280-611: The drive sprocket and tread of the heaviest German tank or self-propelled gun . The IS-122 replaced the IS-85, and began mass production as the IS-2. The 85 mm gun saw service in the lighter SU-85 and T-34-85. The Soviets did not recognize different production models of KV-1 during the war; designations like model 1939 (M1939, Russian: Obr. 1939 ) were introduced later in military publications. These designations, however, are not strict and describe leading changes, while other changes might be adapted earlier or later in specific production batches. Designations like KV-1A were applied by
8418-406: The driver's front plate and nose. The IS-2's 122 mm gun could penetrate the Tiger's front armour from between 1,500 and 2,500 m (0.93 and 1.55 mi), depending on the impact angle. However, according to Steven Zaloga, the IS-2 and Tiger I could each knock the other out in normal combat distances below 1,000 m. At longer ranges, the performance of each respective tank against each other
SECTION 60
#17328588428228556-460: The early Panzer III and Panzer IV tanks fielded by the invading German forces. Until the Germans developed more effective guns, the KV-1 was invulnerable to almost any German weapon except the 8.8 cm Flak gun . Prior to the start of Operation Barbarossa in June 1941, about 500 of the over 22,000 tanks then in Soviet service were of the KV-1 type. As the war progressed, it became evident that there
8694-402: The early period, the Tiger was prone to certain types of track failures and breakdowns. It was expensive to maintain, but generally mechanically reliable. It was difficult to transport and vulnerable to immobilisation when mud, ice, and snow froze between its overlapping and interleaved Schachtellaufwerk -pattern road wheels, often jamming them solid. The tank was given its nickname "Tiger" by
8832-400: The effective front hull armour to 180 mm and side hull to 140 mm, making the Tiger impervious to any Allied gun up to 152 mm. The Tiger's lack of slope for its armour made angling the hull by manual means simple and effective, and unlike the lighter Panzer IV and Panther tanks , the Tiger's thick side armour gave a degree of confidence of immunity from flank attacks. The tank
8970-554: The enemy." Lieutenant Kolobanov served in the post-war Soviet occupation zone in East Germany , where he was convicted again and transferred to the reserves when a subordinate escaped to the British occupation zone. Kolobanov's feat was so great that when telling his story after the war, civilians and military personnel alike did not believe him, sometimes laughing in disbelief while listening to his tale. A monument dedicated to this battle
9108-503: The era, being about twice as heavy as the heaviest German tank at that time (before the Tiger ). As appliqué armour and other improvements were added without increasing engine power, later models were less capable of keeping up to speed with medium tanks and had more trouble with difficult terrain. In addition, its firepower was no better than that of the T-34 . It took field reports from senior commanders "and certified heroes", who could be honest without risk of punishment, to reveal "what
9246-542: The factory shop in May 1945. In the mid-1950s, the remaining IS-2 tanks (mostly model 1944 variants although several model 1943 variants) were upgraded to the IS-2M standard, which introduced fittings such as external fuel tanks on the rear hull (the basic IS-2 had these only on the hull sides), stowage bins on both sides of the hull and protective skirting along the top edges of the tracks . The IS-2 tank first saw combat in early 1944, equipping elite Guards Heavy Tank Regiments of
9384-576: The few Tigers. A stopgap upgrade to the KV series was the short-lived KV-85 or Objekt 239. This was a KV-1S with the new turret from the Object 237 (IS-85) still in development, mounting the same 85 mm D-5T gun as the SU-85 and early versions of the T-34-85 (not yet in production at the time). The 85 mm proved capable of penetrating the Tiger I from 1000 m and the demand for it slowed production of
9522-459: The firepower and armor of the heavy tank—had rendered heavy tanks obsolete. In the late 1960s the remaining Soviet heavy tanks were transferred to Red Army reserve service and storage. The IS-2 Model 1944 remained in service much longer in the armies of Cuba , China and North Korea . A regiment of Chinese IS-2s was available for use in the Korean War but saw no service there. There are several surviving IS-1 and IS-2 tanks, with examples found at
9660-483: The first year of the German invasion of the Soviet Union . In certain situations, even a single KV-1 or KV-2 supported by infantry could halt German formations. The German Wehrmacht at that time rarely deployed its tanks against KVs, as their own armament was too poor to deal with the " Russischer Koloss " – "Russian Colossus". The KV tanks were practically immune to the 3.7 cm KwK 36 and howitzer -like, short-barreled 7.5 cm KwK 37 guns mounted, respectively, on
9798-408: The following: Kliment Voroshilov tank The Kliment Voroshilov ( KV ; Russian : Климент Ворошилов, КВ ) tanks are a series of Soviet heavy tanks named after the Soviet defence commissar and politician Kliment Voroshilov who operated with the Red Army during World War II . The KV tanks were known for their heavy armour protection during the early stages of the war, especially during
9936-434: The gun while the turret began moving again, the other five or six shots having not fully penetrated. Apparently, the KV-1 crew had remarkably only been stunned by the shots which had entered the turret. Afterwards, they were buried nearby with military honours by the German unit. On August 14, 1941, the vanguard of the German 8th Panzer Division approached Krasnogvardeysk ( Gatchina ) near Leningrad ( St Petersburg ), and
10074-467: The heaviest KV model 1942 tank, with thicker front armor and a much-improved turret design. The tank could carry thicker armor than the KV series, while remaining lighter, due to the better layout of the armor envelope. The KV's armor was less well-shaped and featured heavy armor even on the rear, while the IS series concentrated its armor at the front. The IS-2 was slightly heavier than the Panther, much lighter than
10212-459: The hull sides. The VK 36.01 (H) was intended to carry a 7.5 cm L/24, a 7.5 cm L/43, or a 7.5 cm L/70, or a 12.8 cm L/28 cannon in a Krupp turret that looked similar to an enlarged Panzer IV Ausf. C turret. The hull for one prototype was built, followed later by five more. The six turrets built were never fitted and were used as part of the Atlantic Wall . The VK 36.01 (H) project
10350-451: The left of the gun, and the commander behind him. There was also a folding seat on the right for the loader. The turret had a full circular floor and 157 cm (62 in) headroom. Early versions of the Tiger I's turret included two pistol ports ; however, one of these was replaced with a loader escape hatch and the other was removed from later designs. Post-war testing by the Allies found
10488-494: The main competing designs was the SMK , which in its final form had two turrets, mounting one 76.2 mm and one 45 mm weapon. The designers of the SMK independently drew up a single-turreted variant and this received approval at the highest level. Two of these, named after the People's Commissar for Defence , were ordered alongside a single SMK. The smaller hull and single turret enabled
10626-431: The main stumbling block of the KV-1, and there was some truth to rumors of Soviet drivers having to shift gears with a hand sledge"; and the ergonomics were poor, with limited visibility. Furthermore, at 45 tons, it was simply too heavy. This severely impacted the maneuverability, not so much in terms of maximum speed, as through inability to cross many bridges medium tanks could cross. The KV outweighed most other tanks of
10764-471: The maximum allowable engine speed of 3,000 rpm. The direction and speed of traverse was controlled by the gunner through foot pedals, the speed of traverse corresponding to the level of depression the gunner applied to the foot pedal. This system allowed for very precise control of powered traverse, a light touch on the pedal resulting in a minimum traverse speed of 0.1 degrees per second (360 degrees in 60 minutes), unlike in most other tanks of
10902-618: The ministry for armament and ammunition by 7 August 1941, and the Roman numeral was added after the Tiger II entered production. It was classified with ordnance inventory designation Sd.Kfz. 182 . The tank was later re-designated as Panzerkampfwagen VI Ausführung E (abbreviated as Pz.Kpfw. VI Ausf. E ) in March 1943, with ordnance inventory designation Sd.Kfz. 181 . Today, only nine Tiger I tanks survive in museums and private collections worldwide. As of 2021 , Tiger 131 (captured during
11040-453: The model 1944 did not fully replace the model 1943. In comparison to the Tiger I, the IS-2 had advantages in armour, even though it was 10 tons lighter. In 1944, the IS-2 was the only large-scale Allied tank whose armor provided some protection from the well-known Tiger 88mm long-barreled guns and Panther 75mm L/70 guns. The IS-2 was succeeded by the IS-3 , which was developed in late 1944 and left
11178-402: The more than 200 Soviet tanks lost at Raseiniai, 29 were KVs. The KV's strengths included armor that was impenetrable by any tank-mounted weapon then in service except at point-blank range, that it had good firepower, and that it had good flotation on soft ground. It also had serious flaws: it was difficult to steer; the transmission (which was a twenty-year-old Holt Caterpillar design) "was
11316-632: The multi-turreted T-35 heavy tank, Soviet tank designers started drawing up replacements. The T-35 conformed to the 1920s notion of a "breakthrough tank" with very heavy firepower though its armour protection was lacking and it suffered from poor mobility. The Spanish Civil War demonstrated the need for much heavier armour on tanks, and was the main influence on Soviet tank design just prior to World War II. Several competing designs were offered, and even more were drawn up prior to reaching prototype stage. All had heavy armour, torsion-bar suspension , wide tracks, and were of welded and cast construction. One of
11454-656: The new heavy tank series was named the Iosif Stalin tank , after the Soviet leader Stalin . The KV-13 program's IS-85 prototype was accepted for production as the IS-1 (or IS-85, Object 237) heavy tank. After testing with both the 100 mm D-10 and 122 mm guns, the D-25T 122 mm gun was selected as the main armament of the new tank, primarily because of its ready availability and the effect of its large high-explosive shell when attacking German fortifications. The 122 mm D-25T used
11592-574: The new modifications could take several months. The humorous and somewhat racy crew manual, the Tigerfibel , was the first of its kind for the German Army and its success resulted in more unorthodox manuals that attempted to emulate its style. Among other variants of the Tiger, a heavily armoured casemate self-propelled rocket projector, today commonly known as the Sturmtiger , was built, which mounted
11730-524: The nose from 400 m (1,300 ft) and the turret front from 700 m (2,300 ft). The M3 90 mm cannon used as a towed anti-aircraft and anti-tank gun, and later mounted in the M36 tank destroyer and finally the late-war M26 Pershing , could penetrate the Tiger's front plate at a range of 1,000 m using standard ammunition, and from beyond 2,000 m (6,600 ft) when using HVAP. Soviet ground trial testing conducted in May 1943 determined that
11868-489: The older F-34 76.2 mm tank gun, the D-25 delivered 5.37 times the muzzle energy. After testing both the D-25 and D-10 on the IS-122, the former was selected as the main armament of the new tank. The D-25 used a separate shell and powder charge, resulting in a lower rate of fire compared to the single-piece ammunition used in most tanks, a serious disadvantage in tank-to-tank engagements. Soviet proving-ground tests showed that
12006-411: The only Soviet force available at the time to attempt to stop the German advance consisted of five well-hidden KV-1 tanks, dug in within a grove at the edge of a swamp. KV-1 tank no. 864 was commanded by the leader of this small force, Lieutenant Zinoviy Kolobanov . German forces attacked Krasnogvardeysk from three directions. Near Noviy Uchkhoz settlement the geography favoured the Soviet defenders as
12144-425: The only road in the region passed the swamp, and the defenders commanded this choke point from their hidden position. Lieutenant Kolobanov had carefully studied the situation and readied his detachment the day before. Each KV-1 tank carried twice the normal amount of ammunition, two-thirds being armour-piercing rounds. Kolobanov ordered his other commanders to hold their fire and await orders. He did not want to reveal
12282-459: The opportunity to destroy the second tank. Only then did the Germans realize they were under attack, but they failed to find the source of the shots. While the German tanks were firing blindly, Kolobanov knocked out the trailing German tank, thus boxing in the entire column. Although the Germans correctly guessed the direction of fire, they could only spot Lieutenant Kolobanov's tank, and now attempted to engage an unseen enemy. German tanks moving off
12420-441: The performance of each tank against each other was dependent on the crew and combat situation. The large 122 mm HE shell was its main asset, proving highly useful and destructive as an infantry-killer. In extremis, the IS-2 engaged enemy heavy armor with OF-471 (Russian: ОФ-471 ) high explosive projectiles. These shells weighed 25 kg (55 lb), a muzzle velocity of 800 m/s (2,600 ft/s), and were equipped with
12558-455: The power output to 521 kW (699 hp). The engine was in V-form, with two cylinder banks set at 60 degrees. An inertia starter was mounted on its right side, driven via chain gears through a port in the rear wall. The engine could be lifted out through a hatch on the rear hull roof. In comparison to other V12 and various vee-form gasoline engines used for tanks, the eventual HL 230 engine
12696-467: The production of 50 KVs was ordered. During the war, the Soviets found it difficult to deal with the concrete bunkers used by the Finns and a request was made for a tank with a large howitzer. One of the rush projects to meet the request was to put the howitzer in a new turret on one of the KV tanks. Initially known as 'Malen'kaya Bashenka' (little turret) and 'Bol'shaya Bashnya' (big turret), the 76-mm-armed tank
12834-408: The road bogged down in the surrounding soft ground, becoming easy targets. 22 German tanks and 2 towed artillery pieces fell victim to Kolobanov's No. 864 before it ran out of ammunition. Kolobanov ordered in another KV-1, and 21 more German tanks were destroyed before the half-hour battle ended. A total of 43 German tanks were destroyed by just five Soviet KV-1s (two more remained in reserve). After
12972-454: The roadwheels of a Schachtellaufwerk -equipped vehicle could also become packed with mud or snow that could then freeze. Presumably, German engineers, based on the experience of the half-tracks, felt that the improvement in off-road performance, track and wheel life, mobility with wheels missing or damaged, plus additional protection from enemy fire was worth the maintenance difficulties of a complex system vulnerable to mud and ice. This approach
13110-560: The same report. Testing with captured Tiger I tanks in Kubinka showed that the 122 mm D-25T was capable of penetrating the Tiger's turret from 1,000–1,500 m (1,100–1,600 yd) and the weld joint or edges of the front hull plates at ranges of 500–600 m (550–660 yd). In 1944, the BR-471 was the sole armor-piercing round available. An improved version, the BR-471B (Russian: БР-471Б )
13248-530: The seam welds. The performance of the 122 mm AP shells of the IS-2 against the Panther improved considerably. The reports from the front described cases where the BR-471 APHE round 122 mm projectile fired from 2,500 m (2,700 yd) ricocheted off the front armor of a Panther, leaving huge breaches in it. According to Steven Zaloga, the IS-2 and Tiger I could knock each other out in normal combat distances below 1,000 m (1,100 yd). At any range,
13386-414: The shape and thickness of the armour, which also reduced the exterior surface relative to tank volume. However, casting had to account for the metal shrinking as it cooled (becoming denser) and with limitations on Soviet casting technology, IS-2 armour thickness could vary even when produced from the same mold. Lower-quality alloys had to sometimes be used, substituting manganese for nickel, meaning that while
13524-457: The side of the pre-production run were added, while removable mudguards saw full incorporation in September. Smoke discharge canisters, three on each side of the turret, were added in August 1942. In later years, similar changes and updates were added, such as the addition of Zimmerit (a non-magnetic anti-mine coating), in late 1943. Due to slow production rates at the factories, incorporation of
13662-403: The side surfaces. Four prototype hulls were completed for testing. Two of these were later modified to build the " Sturer Emil " (12.8 cm (5.0 in) Selbstfahrlafette L/61) self-propelled anti-tank gun. The VK 36.01 (H) was intended to weigh 40 tonnes, with 100 mm (3.9 in) of armour on front surfaces, 80 mm (3.1 in) on turret sides and 60 mm (2.4 in) on
13800-445: The solely clutch and brake steering systems used by the Panzer III , IV and T-34 and previous KV tanks. Its reduced weight allowed it to achieve a top speed of 43.3 km/h. Over 1,300 were built before production ended in August 1943. Although the KV-1S was, according to some, the best of the KV tanks, overcoming its predecessors' problems (at a cost of losing the heavy armor that made the earlier tanks so valuable, making it more of
13938-467: The stepped hull front was replaced with an improved single casting of 120 mm thickness angled at 60 degrees. This new nose lacked the opening driver's visor. It is sometimes incorrectly referred to as the IS-2M, but that designation actually refers to a much later modernization program from the 1950s. Other minor upgrades included the addition of a travel lock on the hull rear, wider mantlet and, on very late models, an anti-aircraft machine gun . However,
14076-421: The tank from its rear. Of several shots fired, only two penetrated the tank. German infantry then advanced, with the KV opening machine-gun fire against them. The tank's resistance was finally ended by grenades thrown into the tank's hatches. According to some accounts, the crew was buried by the German soldiers with full military honours; in other accounts, the crew escaped during the night. General Erhard Raus
14214-435: The tank held an engine compartment flanked by two separate rear compartments each containing a fuel tank and radiator. The Germans had not developed an adequate diesel engine, so a petrol (gasoline) powerplant had to be used instead. The original engine used was a 21.35 L (1,303 in ) 12-cylinder Maybach HL210 P45 developing 485 kW (650 hp) at 3,000 rpm and a top speed of 38 km/h (24 mph). It
14352-403: The tank to be uncomfortable and spartan. For example, the gunner suffered from clumsy controls and a cramped area. This was in contrast to German crews who found them to be spacious and comfortable. A substantial problem with the Tiger was that its production required considerable resources in terms of manpower and material, which led to it being expensive: the Tiger I cost over twice as much as
14490-483: The tank was being produced at all, when the T-34 could seemingly do everything the KV could do and much more cheaply. The Soviet heavy tank program was close to cancellation in mid-1943. The appearance of the German Panther tank in the summer of 1943 persuaded the Red Army to make a serious upgrade of its tank force for the first time since 1941. Soviet tanks needed bigger guns to take on the growing numbers of Panthers and
14628-447: The tank, with a complement of 20 HE rounds, and 8 AP rounds the norm. The IS-2's armour was primarily composed from casting, which involves pouring molten metal into a mold and letting it cool. This method was done to reduce production costs and thus increase the number of vehicles that could be built (in contrast to its contemporary the Tiger II, which required significant machining in its construction). Casting also made it easier to vary
14766-432: The tank. However, in service, Tigers were frequently transported by rail with their combat tracks fitted, as long as the train crew knew there were no narrow tunnels or other obstructions on the route that would prevent an oversized load from passing, despite this practice being strictly forbidden. The Tiger tank's combat weight of 56 tons was often too heavy for small bridges which had 35 ton weight limits, so it
14904-474: The time (e.g., the US M4 Sherman or Soviet T-34) this allowed for fine laying of the gun without the gunner needing to use his traverse handwheel. The suspension used sixteen torsion bars , with eight suspension arms per side. To save space, the swing arms were leading on one side and trailing on the other side; this is called an H suspension setup. There were three road wheels (one of them double, closest to
15042-438: The total force, so only one exposed tank at a time would engage the enemy. On August 14, the German 8th Panzer Division's vanguard ventured directly into the well-prepared Soviet ambush, with Kolobanov's tank knocking out the lead German tank with its first shot. The Germans falsely assumed that their lead tank had hit an anti-tank mine and failed to realize that they had been ambushed. The German column stopped, giving Kolobanov
15180-426: The town of Oględów , toward Staszów . The extremely sandy terrain forced the eleven King Tigers to keep to the roads, whilst the defending Soviet forces positioned their tanks and assault guns in ambush positions and concentrated on the known German avenues of approach. When the attack started, three Tiger IIs were destroyed by fire from Soviet IS-2 tanks at a range of 800 m (2,600 ft), and one more Tiger II
15318-472: The track's centre) on each arm, in a so-called Schachtellaufwerk overlapping and interleaved arrangement, similar to that pioneered on German half-tracked military vehicles of the pre-World War II era, with the Tiger I being the first all-tracked German AFV built in quantity to use such a road wheel arrangement. The wheels had a diameter of 800 mm (31 in) in the Schachtellaufwerk arrangement for
15456-602: Was accepted, mainly because the Porsche VK 4501 (P) prototype design used a troubled petrol-electric transmission system which needed large quantities of copper for the manufacture of its electrical drivetrain components, a strategic war material of which Germany had limited supplies with acceptable electrical properties for such uses. Production of the Panzerkampfwagen VI Ausf. H began in August 1942. Expecting an order for his tank, Porsche built 100 chassis. After
15594-468: Was already standard on German half-tracks such as the Sd. Kfz. 7 . The VK 30.01 (H) was intended to mount a low-velocity 7.5 cm L/24 infantry support gun, a 7.5 cm L/40 dual-purpose anti-tank gun, or a 10.5 cm (4.1 in) L/28 field gun in a Krupp turret. Overall weight was to be 33 tonnes. The armour was designed to be 50 mm (2.0 in) on frontal surfaces and 30 mm (1.2 in) on
15732-471: Was also immune to Soviet anti-tank rifle fire to the sides and rear. Its large calibre 8.8 cm provided superior fragmentation and high explosive content over the 7.5 cm KwK 42 gun. Therefore, comparing the Tiger with the Panther, for supporting the infantry and destroying fortifications, the Tiger offered superior firepower. The destruction of an antitank gun was often accepted as nothing special by lay people and soldiers from other branches. Only
15870-404: Was an open crew compartment, with the driver and radio-operator seated at the front on either side of the gearbox. Behind them the turret floor was surrounded by panels forming a continuous level surface. This helped the loader to retrieve the ammunition, which was mostly stowed above the tracks. Three men were seated in the turret; the loader to the right of the gun facing to the rear, the gunner to
16008-627: Was built, and no turret was fitted. Further development of the Durchbruchwagen was dropped in 1938 in favour of the larger and better-armoured VK 30.01 (H) and VK 36.01 (H) designs. Both the Durchbruchwagen I and II prototype hulls were used as test vehicles until 1941. The VK 30.01 (H) medium tank and the VK 36.01 (H) heavy tank designs pioneered the use of the complex Schachtellaufwerk track suspension system of torsion bar -sprung, overlapped and interleaved main road wheels for tank use. This concept
16146-418: Was carried on, in various forms, to the Panther and the non-interleaved wheel design for the Tiger II . Eventually, a new 80 cm diameter 'steel' wheel design with an internally sprung steel-rim tire was substituted. As these new wheels could carry more weight, the outermost wheel on each suspension arm was removed. The same wheels would also be used on the Tiger II. To support the considerable weight of
16284-460: Was commander of the Kampfgruppe of the 6th Panzer Division , the unit delayed by the lone vehicle. He described it as a KV-1 , which was damaged by several 8.8 cm anti-tank gun shots fired from behind the vehicle while it was distracted by Panzer 35(t) tanks from Panzer Battalion 65, and the KV-1 crew were killed by members of a pioneer unit who pushed grenades through two holes made by
16422-421: Was dependent on the crew and the combat situation. The British Churchill Mk IV was vulnerable to the Tiger from the front at between 1,100 and 1,700 m (3,600 and 5,600 ft) at a 30 degrees side angle, its strongest point being the nose and its weakest the turret. According to an STT document dated April 1944, it was estimated that the British 76.2 mm 17-pounder (used as an anti-tank gun, on
16560-414: Was designed to ford bodies of water up to 5 m (15 ft) deep. This required unusual mechanisms for ventilation and cooling when underwater. At least 30 minutes of set-up time was required, with the turret and gun being locked in the forward position, and a large snorkel tube raised at the rear. An inflatable doughnut-shaped ring sealed the turret ring. The two rear compartments (each containing
16698-611: Was developed in spring 1945 but was available in quantity only after World War II ended. According to the same Wa Pruef 1 report, it was estimated that at 30 degree obliquity the hull armor of the Soviet IS-2 model 1943 would be defeated by a Tiger I between 100 and 300 m (0.062 and 0.186 mi) at the driver's front plate and nose, while the IS-2's 122 mm gun would penetrate the Tiger's front armor from between 500 and 1,500 m (0.31 and 0.93 mi). A Panther had to close to 600 m (660 yd) to guarantee penetration of
16836-788: Was discontinued in early 1942 in favour of the VK 45.01 project. Combat experience against the French SOMUA S35 cavalry tank and Char B1 heavy tank, and the British Matilda II infantry tanks during the Battle of France in June 1940 showed that the German Army needed better armed and armoured tanks. On 26 May 1941, Henschel and Ferdinand Porsche were asked to submit designs for a 45-tonne heavy tank, to be ready by June 1942. Porsche worked on an updated version of their VK 30.01 (P) Leopard tank prototype while Henschel worked on an improved VK 36.01 (H) tank. Henschel built two prototypes:
16974-440: Was due to shortages in fuel supply. They used a mixture of turreted and turretless hulls. They were used to train Tiger tank crews, and were not used in combat. Hitler's order, dated 27 February 1944, abolished the designation Panzerkampfwagen VI and ratified Panzerkampfwagen Tiger Ausf. E, which was the official designation until the end of the war. For common use it was frequently shortened to Tiger . A report prepared by
17112-521: Was expensive to produce. Only about 210 KV-2s were made, all in 1940–1941, making it one of the rarest Soviet tanks. The KV-1 continued to get more armor to compensate for the increasing effectiveness of German weapons. This culminated in the KV-1 model 1942 (German designation KV-1C), which had very heavy armor but lacked a corresponding improvement to the engine. It now weighed about 52 tons. Tankers complained that, although they were well-protected, their mobility
17250-534: Was found to be underpowered for the vehicle from the 251st Tiger onwards. It was replaced by the upgraded HL 230 P45, a 23.095 L (1,409 in ) engine developing 521 kW (699 hp) at 3,000 rpm. The main difference between these engines was that the original Maybach HL 210 used an aluminium engine block while the Maybach HL 230 used a cast-iron engine block. The cast-iron block allowed for larger cylinders (and thus, greater displacement) which increased
17388-434: Was given the codename Object 237. Before Object 237 had time to mature, intense tank fighting in the summer of 1943 demanded a response. Dukhov's team was instructed to create a stopgap KV tank, the KV-85, which was armed with the 52-K -derivative gun of the SU-85 , the 85 mm D-5T, that proved capable of penetrating the Tiger I from 1,000 m (1,100 yd). The KV-85 was created by mounting an Object 237 turret on
17526-442: Was installed in the village of Noviy Uchkhoz in 1980, at the place where Kolobanov's KV-1 was dug in, due solely to the demands of the villagers. It was impossible to find a KV-1 tank, so an IS-2 heavy tank was installed there instead. The Soviet victory was the result of a well-planned ambush in advantageous ground and of technical superiority. Most of the German tanks in this battle were Panzer IIs , armed with 20 mm guns, and
17664-436: Was knocked out a few hours later by a T-34/76 at a range of less than 400 m (1,300 ft). Later in the day, Soviet forces counter-attacked and seized the town of Oględów and found three abandoned Tiger IIs. The capture of these tanks allowed the Soviets to conduct tests at Kubinka and to evaluate its strengths and weaknesses. By the 1950s, the emergence of the main battle tank concept—combining medium-tank mobility with
17802-410: Was largely confined to roads and tracks, making defence against them far easier. Many of these early models were plagued by problems with the transmission, which had difficulty handling the great weight of the vehicle if pushed too hard. It took time for drivers to learn how to avoid overtaxing the engine and transmission, and many broke down. The most significant event from this engagement was that one of
17940-466: Was little sense in producing the expensive KV tanks, as the T-34 medium tank performed better (or at least equally well) in all practical respects. In fact the only advantage the KV had over the T-34/76 was its larger and roomier three-man turret. Later in the war, the KV series became a base for the development of the IS (Iosif Stalin) series of tanks and self-propelled guns. After disappointing results with
18078-617: Was nearly 4 L (240 in ) smaller in displacement than the Allied British Rolls-Royce Meteor V12 AFV power plant, itself adapted from the RR Merlin but de-rated to 448 kW (601 hp) power output; and the American Ford-designed precursor V12 to its Ford GAA V-8 AFV engine of 18 litre displacement, which in its original V12 form would have had the same 27 L (1,600 in ) displacement as
18216-547: Was not slower than the best of its opponents. Although the general design and layout were broadly similar to the Panzer IV medium tank, the Tiger weighed more than twice as much. This was due to its substantially thicker armour, the larger main gun , greater volume of fuel and ammunition storage, larger engine, and a more solidly built transmission and suspension. The Tiger I had frontal hull armour 100 mm (3.9 in) thick, frontal turret of 100 mm and gun mantlet with
18354-447: Was partially addressed by the KV-1S tank, which had thinner armor than the original, making it lighter and faster. It was competitive with the T-34 but at the cost of no longer having the heavier armor. Production of the KV-1S was gradually replaced by the SU-152 and ended in April 1943. The capture of a German Tiger tank in January 1943 led to a decision to develop a new heavy tank, which
18492-451: Was poor and they had no firepower advantage over the T-34 medium tank. In response to criticisms, the lighter KV-1S was developed, with thinner armor and a smaller, lower turret in order to reclaim some speed. The KV-1S had a commander's cupola with all-around vision blocks. It also had a sophisticated planetary transmission that significantly increased the reliability, and allowed use of more efficient regenerative geared steering, unlike
18630-509: Was powered by mechanical drive from the engine. A full rotation took about a minute. Another new feature was the Maybach-Olvar hydraulically controlled semi-automatic pre-selector gearbox . The extreme weight of the tank also required a new steering system. Germany's Argus Motoren , where Hermann Klaue had invented a ring brake in 1940, supplied them for the Arado Ar 96 and also supplied
18768-616: Was redesignated as the KV-1 Heavy Tank and the 152 mm howitzer one as KV-2 Heavy Artillery Tank . KV tanks first faced the Germans in the Battle of Raseiniai , just after the start of Operation Barbarossa . On 23 June, over 200 German tanks advancing through Lithuania encountered Soviet armor, including KV-1 and KV-2 tanks. While their frontal armor was sufficient to deflect anti-tank fire, German troops were able to outflank them and destroy them with explosive charges or lure them to within point-blank range of direct-fire artillery. Of
18906-408: Was simplified to IS-1 after the introduction of the IS-122, later renamed as IS-2 for security purposes. By 1943, engineers had succeeded in mounting the 85 mm gun to the T-34 medium tank, making it as well-armed as the KV-85 heavy tank. Efforts to up-gun the IS-85 began in late 1943. Two candidate weapons were the D-25 122 mm tank gun, the ballistic characteristics of which were identical to
19044-465: Was superior in penetration and accuracy. British trials found the gun took from 6 to 16 seconds to reload varying on turret position and consequently which storage bin was being used. The ammunition for the Tiger had electrically fired primers. Four types of ammunition were available but not all were fully available; the PzGr 40 shell used tungsten, which was in short supply as the war progressed. The rear of
#821178