132-513: The Stipa-Caproni , also known as the Caproni Stipa , was an experimental Italian aircraft designed in 1932 by Luigi Stipa (1900–1992) and built by Caproni . It featured a hollow, barrel-shaped fuselage with the engine and propeller completely enclosed by the fuselage—in essence, the whole fuselage was a single ducted fan . Although the Regia Aeronautica (Italian Royal Air Force)
264-476: A limit value of one, for large time t . In other words, velocity asymptotically approaches a maximum value called the terminal velocity v t : v t = 2 m g ρ A C D . {\displaystyle v_{t}={\sqrt {\frac {2mg}{\rho AC_{D}}}}.\,} For an object falling and released at relative-velocity v = v i at time t = 0, with v i < v t ,
396-665: A limit value of one, for large time t . Velocity asymptotically tends to the terminal velocity v t , strictly from above v t . For v i = v t , the velocity is constant: v ( t ) = v t . {\displaystyle v(t)=v_{t}.} These functions are defined by the solution of the following differential equation : g − ρ A C D 2 m v 2 = d v d t . {\displaystyle g-{\frac {\rho AC_{D}}{2m}}v^{2}={\frac {dv}{dt}}.\,} Or, more generically (where F ( v ) are
528-558: A testbed — instead envisioning its use in large, multi-engine flying wing aircraft he had been designing in which the aerodynamic drag properties would not be significant, and the Italian government publicized the Stipa-Caproni's design as an example of Italian aviation technology prowess. None of Stipa's flying-wing aircraft designs were built, but experiences collected with the Stipa-Caproni did become an important influence in
660-525: A Luigi Stipa design in the mid-1930s, and various aircraft designs such as the German Heinkel "T" fighter of 1940 are thought to have incorporated some of Stipa's ideas as demonstrated by the Stipa-Caproni. The Kort nozzle ducted fan of today — designed in Germany in 1934 — uses many of Stipa's principles. The modern turbofan engine is thought by some aviation historians to be
792-618: A branch of the Bourbons ascended to the throne of Sicily and Naples. During the Napoleonic Wars , north and central Italy were reorganised as Sister Republics of France and, later, as a Kingdom of Italy . The south was administered by Joachim Murat , Napoleon's brother-in-law. 1814's Congress of Vienna restored the situation of the late 18th century, but the ideals of the French Revolution could not be eradicated, and re-surfaced during
924-514: A crucially innovative role in financial development by devising banking practices, and enabling new forms of social organisation. In coastal and southern areas, maritime republics dominated the Mediterranean and monopolised trade to the Orient. They were independent thalassocratic city-states, in which merchants had considerable power. Although oligarchical, the relative political freedom they afforded
1056-452: A descendant of the intubed propeller demonstrated in the Stipa-Caproni. In Australia , Lynette Zuccoli and Aerotec Queensland designed a 3/5-scale replica of the Stipa-Caproni, accurate even in terms of paint scheme and markings, powered by an Italian Simonini racing engine. They built it in 1998 and, in October 2001, succeeded in making two directional test flights with it with Bryce Wolff at
1188-417: A fairly small rudder and elevators were mounted on the trailing edge of the duct, allowing the ducted propeller wash to flow directly over them as it exited the fuselage to improve handling. The propeller was mounted inside the fuselage tube, flush with the leading edge of the fuselage, and the 120-horsepower (89 kW) de Havilland Gipsy III engine that powered it was mounted within the duct behind it at
1320-523: A famous meeting between Garibaldi and Victor Emmanuel II , the last king of Sardinia, during which Garibaldi shook Victor Emanuel's hand and hailed him as King of Italy . Cavour agreed to include Garibaldi's southern Italy in a union with the Kingdom of Sardinia in 1860. This allowed the Sardinian government to declare a united Italian kingdom on 17 March 1861, with Victor Emmanuel II as its first king. In 1865,
1452-809: A fluid at relatively slow speeds (assuming there is no turbulence). Purely laminar flow only exists up to Re = 0.1 under this definition. In this case, the force of drag is approximately proportional to velocity. The equation for viscous resistance is: F D = − b v {\displaystyle \mathbf {F} _{D}=-b\mathbf {v} \,} where: When an object falls from rest, its velocity will be v ( t ) = ( ρ − ρ 0 ) V g b ( 1 − e − b t / m ) {\displaystyle v(t)={\frac {(\rho -\rho _{0})\,V\,g}{b}}\left(1-e^{-b\,t/m}\right)} where: The velocity asymptotically approaches
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#17328586043181584-450: A fluid increases as the cube of the velocity increases. For example, a car cruising on a highway at 50 mph (80 km/h) may require only 10 horsepower (7.5 kW) to overcome aerodynamic drag, but that same car at 100 mph (160 km/h) requires 80 hp (60 kW). With a doubling of speeds, the drag/force quadruples per the formula. Exerting 4 times the force over a fixed distance produces 4 times as much work . At twice
1716-406: A fluid. Parasitic drag is made up of multiple components including viscous pressure drag ( form drag ), and drag due to surface roughness ( skin friction drag ). Additionally, the presence of multiple bodies in relative proximity may incur so called interference drag , which is sometimes described as a component of parasitic drag. In aviation, induced drag tends to be greater at lower speeds because
1848-423: A high angle of attack is required to maintain lift, creating more drag. However, as speed increases the angle of attack can be reduced and the induced drag decreases. Parasitic drag, however, increases because the fluid is flowing more quickly around protruding objects increasing friction or drag. At even higher speeds ( transonic ), wave drag enters the picture. Each of these forms of drag changes in proportion to
1980-693: A human body ( d {\displaystyle d} ≈0.6 m) v t {\displaystyle v_{t}} ≈70 m/s, for a small animal like a cat ( d {\displaystyle d} ≈0.2 m) v t {\displaystyle v_{t}} ≈40 m/s, for a small bird ( d {\displaystyle d} ≈0.05 m) v t {\displaystyle v_{t}} ≈20 m/s, for an insect ( d {\displaystyle d} ≈0.01 m) v t {\displaystyle v_{t}} ≈9 m/s, and so on. Terminal velocity for very small objects (pollen, etc.) at low Reynolds numbers
2112-728: A member of NATO . The Marshall Plan revived the economy, which, until the late 1960s, enjoyed a period called the Economic Miracle . In the 1950s, Italy became a founding country of the European Communities , a forerunner of the European Union. From the late 1960s until the early 1980s, the country experienced the Years of Lead , characterised by economic difficulties, especially after the 1973 oil crisis ; social conflicts; and terrorist massacres. The economy recovered and Italy became
2244-624: A permanent seat in the League of Nations 's executive council. The socialist agitations that followed the devastation of the Great War, inspired by the Russian Revolution , led to counter-revolution and repression throughout Italy. The liberal establishment, fearing a Soviet-style revolution, started to endorse the small National Fascist Party , led by Mussolini. In October 1922, the Blackshirts of
2376-532: A revival of Italian republicanism. Italy became a republic after the 1946 Italian institutional referendum held on 2 June, a day celebrated since as Festa della Repubblica . This was the first time women voted nationally. Victor Emmanuel III's son, Umberto II , was forced to abdicate. The Republican Constitution was approved in 1948. Under the Treaty of Paris between Italy and the Allied Powers , areas next to
2508-652: A series of wars in the peninsula. During the High Renaissance , popes such as Julius II (1503–1513) fought for control of Italy against foreign monarchs; Paul III (1534–1549) preferred to mediate between the European powers to secure peace. In the middle of such conflicts, the Medici popes Leo X (1513–1521) and Clement VII (1523–1534) faced the Protestant Reformation in Germany, England and elsewhere. In 1559, at
2640-465: A small sphere with radius r {\displaystyle r} = 0.5 micrometre (diameter = 1.0 μm) moving through water at a velocity v {\displaystyle v} of 10 μm/s. Using 10 Pa·s as the dynamic viscosity of water in SI units, we find a drag force of 0.09 pN. This is about the drag force that a bacterium experiences as it swims through water. The drag coefficient of
2772-623: A sphere can be determined for the general case of a laminar flow with Reynolds numbers less than 2 ⋅ 10 5 {\displaystyle 2\cdot 10^{5}} using the following formula: C D = 24 R e + 4 R e + 0.4 ; R e < 2 ⋅ 10 5 {\displaystyle C_{D}={\frac {24}{Re}}+{\frac {4}{\sqrt {Re}}}+0.4~{\text{;}}~~~~~Re<2\cdot 10^{5}} For Reynolds numbers less than 1, Stokes' law applies and
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#17328586043182904-403: Is a force acting opposite to the relative motion of any object moving with respect to a surrounding fluid . This can exist between two fluid layers, two solid surfaces, or between a fluid and a solid surface. Drag forces tend to decrease fluid velocity relative to the solid object in the fluid's path. Unlike other resistive forces, drag force depends on velocity. This is because drag force
3036-483: Is a streamlined body, and a cylinder, which is a bluff body. Also shown is a flat plate illustrating the effect that orientation has on the relative proportions of skin friction, and pressure difference between front and back. A body is known as bluff or blunt when the source of drag is dominated by pressure forces, and streamlined if the drag is dominated by viscous forces. For example, road vehicles are bluff bodies. For aircraft, pressure and friction drag are included in
3168-558: Is about v t = g d ρ o b j ρ . {\displaystyle v_{t}={\sqrt {gd{\frac {\rho _{obj}}{\rho }}}}.\,} For objects of water-like density (raindrops, hail, live objects—mammals, birds, insects, etc.) falling in air near Earth's surface at sea level, the terminal velocity is roughly equal to with d in metre and v t in m/s. v t = 90 d , {\displaystyle v_{t}=90{\sqrt {d}},\,} For example, for
3300-448: Is also defined in terms of the hyperbolic tangent function: v ( t ) = v t tanh ( t g v t + arctanh ( v i v t ) ) . {\displaystyle v(t)=v_{t}\tanh \left(t{\frac {g}{v_{t}}}+\operatorname {arctanh} \left({\frac {v_{i}}{v_{t}}}\right)\right).\,} For v i > v t ,
3432-619: Is asymptotically proportional to R e − 1 {\displaystyle \mathrm {Re} ^{-1}} , which means that the drag is linearly proportional to the speed, i.e. the drag force on a small sphere moving through a viscous fluid is given by the Stokes Law : F d = 3 π μ D v {\displaystyle F_{\rm {d}}=3\pi \mu Dv} At high R e {\displaystyle \mathrm {Re} } , C D {\displaystyle C_{\rm {D}}}
3564-399: Is determined by Stokes law. In short, terminal velocity is higher for larger creatures, and thus potentially more deadly. A creature such as a mouse falling at its terminal velocity is much more likely to survive impact with the ground than a human falling at its terminal velocity. The equation for viscous resistance or linear drag is appropriate for objects or particles moving through
3696-401: Is drag which occurs as the result of the creation of lift on a three-dimensional lifting body , such as the wing or propeller of an airplane. Induced drag consists primarily of two components: drag due to the creation of trailing vortices ( vortex drag ); and the presence of additional viscous drag ( lift-induced viscous drag ) that is not present when lift is zero. The trailing vortices in
3828-478: Is influenced by the seas that surround Italy on every side except the north, which constitute a reservoir of heat and humidity. Within the southern temperate zone, they determine a Mediterranean climate with local differences. Because of the length of the peninsula and the mostly mountainous hinterland, the climate is highly diverse. In most inland northern and central regions, the climate ranges from humid subtropical to humid continental and oceanic . The Po Valley
3960-428: Is more or less constant, but drag will vary as the square of the speed varies. The graph to the right shows how C D {\displaystyle C_{\rm {D}}} varies with R e {\displaystyle \mathrm {Re} } for the case of a sphere. Since the power needed to overcome the drag force is the product of the force times speed, the power needed to overcome drag will vary as
4092-595: Is mostly humid subtropical, with cool winters and hot summers. The coastal areas of Liguria , Tuscany, and most of the south generally fit the Mediterranean climate stereotype, as in the Köppen climate classification . Conditions on the coast are different from those in the interior, particularly during winter when the higher altitudes tend to be cold, wet, and often snowy. The coastal regions have mild winters, and hot and generally dry summers; lowland valleys are hot in summer. Winter temperatures vary from 0 °C (32 °F) in
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4224-472: Is presented at Drag equation § Derivation . The reference area A is often the orthographic projection of the object, or the frontal area, on a plane perpendicular to the direction of motion. For objects with a simple shape, such as a sphere, this is the cross sectional area. Sometimes a body is a composite of different parts, each with a different reference area (drag coefficient corresponding to each of those different areas must be determined). In
4356-479: Is proportional to the velocity for low-speed flow and the velocity squared for high-speed flow. This distinction between low and high-speed flow is measured by the Reynolds number . Examples of drag include: Types of drag are generally divided into the following categories: The effect of streamlining on the relative proportions of skin friction and form drag is shown for two different body sections: An airfoil, which
4488-499: Is the tenth-largest country in Europe by area, covering 301,340 km (116,350 sq mi), and third-most populous member state of the European Union , with a population of nearly 60 million. Italy's capital and largest city is Rome ; other major urban areas include Milan , Naples , Turin , Palermo , Bologna , Florence , Genoa , and Venice . The history of Italy goes back to numerous Italic peoples , notably including
4620-578: Is the Reynolds number related to fluid path length L. As mentioned, the drag equation with a constant drag coefficient gives the force moving through fluid a relatively large velocity, i.e. high Reynolds number , Re > ~1000. This is also called quadratic drag . F D = 1 2 ρ v 2 C D A , {\displaystyle F_{D}\,=\,{\tfrac {1}{2}}\,\rho \,v^{2}\,C_{D}\,A,} The derivation of this equation
4752-755: Is the wind speed and v o {\displaystyle v_{o}} is the object speed (both relative to ground). Velocity as a function of time for an object falling through a non-dense medium, and released at zero relative-velocity v = 0 at time t = 0, is roughly given by a function involving a hyperbolic tangent (tanh): v ( t ) = 2 m g ρ A C D tanh ( t g ρ C D A 2 m ) . {\displaystyle v(t)={\sqrt {\frac {2mg}{\rho AC_{D}}}}\tanh \left(t{\sqrt {\frac {g\rho C_{D}A}{2m}}}\right).\,} The hyperbolic tangent has
4884-672: Is water. Including the islands, Italy has a coastline of 7,600 kilometres (4,722 miles) on the Mediterranean Sea , the Ligurian and Tyrrhenian seas, the Ionian Sea , and the Adriatic Sea . Its border with France runs for 488 km (303 mi); Switzerland, 740 km (460 mi); Austria, 430 km (267 mi); and Slovenia, 232 km (144 mi). The sovereign states of San Marino and Vatican City (the smallest country in
5016-645: The Oration on the Dignity of Man , considered the manifesto of the Renaissance. In the arts, the Italian Renaissance exercised a dominant influence on European art for centuries, with artists such as Leonardo da Vinci , Botticelli , Michelangelo , Raphael , Giotto , Donatello , and Titian , and architects such as Filippo Brunelleschi , Andrea Palladio , and Donato Bramante . Italian explorers and navigators from
5148-657: The Achaeans founded various cities. Greek colonisation placed the Italic peoples in contact with democratic forms of government and high artistic and cultural expressions. Ancient Rome, a settlement on the river Tiber in central Italy, founded in 753 BC, was ruled for 244 years by a monarchical system. In 509 BC, the Romans, favouring a government of the Senate and the People ( SPQR ), expelled
5280-598: The Adriatic Sea were annexed by Yugoslavia , resulting in the Istrian-Dalmatian exodus , which involved the emigration of around 300,000 Istrian and Dalmatian Italians . Italy lost all colonial possessions, ending the Italian Empire . Fears of a Communist takeover proved crucial in 1948 , when the Christian Democrats , under Alcide De Gasperi , won a landslide victory. Consequently, in 1949 Italy became
5412-483: The Clean Hands investigation—demanded radical reform. The Christian Democrats, who had ruled for almost 50 years, underwent a crisis and disbanded, splitting into factions. The Communists reorganised as a social-democratic force. During the 1990s and 2000s, centre-right (dominated by media magnate Silvio Berlusconi ) and centre-left coalitions (led by professor Romano Prodi ) alternately governed. In 2011, amidst
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5544-788: The Crimean War . Sardinia fought the Austrian Empire in the Second Italian War of Independence of 1859, with the aid of France, resulting in liberating Lombardy . On the basis of the Plombières Agreement , the Sardinia ceded Savoy and Nice to France, an event that caused the Niçard exodus . In 1860–1861, Garibaldi led the drive for unification in Naples and Sicily. Teano was the site of
5676-595: The Crusades , providing support, transport, but mostly taking political and trading opportunities. Italy first felt the economic changes which led to the commercial revolution : Venice was able to sack Byzantine's capital and finance Marco Polo 's voyages to Asia; the first universities were formed in Italian cities, and scholars such as Aquinas obtained international fame; capitalism and banking families emerged in Florence, where Dante and Giotto were active around 1300. In
5808-809: The Empire of Japan , and strongly supported Francisco Franco in the Spanish Civil War . In 1939, Italy annexed Albania . Italy entered World War II on 10 June 1940. At different times, Italians advanced in British Somaliland , Egypt , the Balkans , and eastern fronts. They were, however, defeated on the Eastern Front as well as in the East African and North African campaigns, losing their territories in Africa and
5940-686: The European Union (light green) – [ Legend ] Italy , officially the Italian Republic , is a country in Southern and Western Europe . It consists of a peninsula that extends into the Mediterranean Sea , with the Alps on its northern land border, as well as nearly 800 islands, notably Sicily and Sardinia . Italy shares its borders with France, Switzerland, Austria, Slovenia, and two enclaves: Vatican City and San Marino . It
6072-776: The Expedition of the Thousand , establishing the Kingdom of Italy . From the late 19th to the early 20th century, Italy rapidly industrialised, mainly in the north, and acquired a colonial empire , while the south remained largely impoverished, fueling a large immigrant diaspora to the Americas. From 1915 to 1918, Italy took part in World War I with the Entente against the Central Powers . In 1922,
6204-536: The Great Recession , Berlusconi resigned and was replaced by the technocratic cabinet of Mario Monti . In 2014, Matteo Renzi became prime minister and the government started constitutional reform. This was rejected in a 2016 referendum and Paolo Gentiloni became prime minister. During the European migrant crisis of the 2010s, Italy was the entry point and leading destination for most asylum seekers entering
6336-857: The Gregorian calendar ; the Jesuit China mission ; the French Wars of Religion ; end of the Thirty Years' War (1618–1648); and the Great Turkish War . The Italian economy declined in the 1600s and 1700s. During the war of the Spanish succession (1700–1714), Austria acquired most of the Spanish domains in Italy, namely Milan, Naples and Sardinia; the latter was given to the House of Savoy in exchange for Sicily in 1720. Later,
6468-498: The House of Savoy to establish a united kingdom encompassing the entire Italian Peninsula . By the mid-19th century, rising Italian nationalism led to revolution. Following the Congress of Vienna in 1815, the political and social Italian unification movement, or Risorgimento , emerged to unite Italy by consolidating the states and liberating them from foreign control. A radical figure was
6600-642: The Italian Peninsula , Sicily and Sardinia (the biggest islands of the Mediterranean), and many smaller islands . Some of Italy's territory extends beyond the Alpine basin, and some islands are located outside the Eurasian continental shelf. The country's area is 301,230 square kilometres (116,306 sq mi), of which 294,020 km (113,522 sq mi) is land and 7,210 km (2,784 sq mi)
6732-608: The Italian fascist dictatorship was established. During World War II , Italy was first part of the Axis until its surrender to the Allied powers (1940–1943), then a co-belligerent of the Allies during the Italian resistance and the liberation of Italy (1943–1945). Following the war, the monarchy was replaced by a republic and the country enjoyed a strong recovery . A developed country , Italy has
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#17328586043186864-672: The Italic peoples . The main historic peoples of possible non-Indo-European or pre-Indo-European heritage include the Etruscans , the Elymians and Sicani of Sicily, and the prehistoric Sardinians , who gave birth to the Nuragic civilisation . Other ancient populations include the Rhaetian people and Camunni , known for their rock drawings in Valcamonica . A natural mummy, Ötzi , dated 3400–3100 BC,
6996-461: The Kvarner Gulf , and the Dalmatian city of Zara . The subsequent Treaty of Rome (1924) led to annexation of Fiume by Italy. Italy did not receive other territories promised by the Treaty of London, so this outcome was denounced as a " mutilated victory ", by Benito Mussolini , which helped lead to the rise of Italian fascism . Historians regard "mutilated victory" as a "political myth", used by fascists to fuel Italian imperialism . Italy gained
7128-408: The Middle East . In the wake of Julius Caesar 's assassination in 44 BC, Rome grew into a massive empire stretching from Britain to the borders of Persia , engulfing the whole Mediterranean basin, in which Greek, Roman, and other cultures merged into a powerful civilisation. The long reign of the first emperor, Augustus , began an age of peace and prosperity. Roman Italy remained the metropole of
7260-479: The National Republican Army . German troops, with RSI collaboration, committed massacres and deported thousands of Jews to death camps. The post-armistice period saw the emergence of the Italian Resistance , who fought a guerrilla war against the Nazi German occupiers and collaborators. This has been described as an Italian civil war due to fighting between partisans and fascist RSI forces. In April 1945, with defeat looming, Mussolini attempted to escape north, but
7392-445: The Norse ; and Amerigo Vespucci , for whom the continent of America is named. A defensive alliance known as the Italic League was formed between Venice, Naples, Florence, Milan, and the Papacy. Lorenzo the Magnificent de Medici was the Renaissance's greatest patron, his support allowed the League to abort invasion by the Turks. The alliance, however, collapsed in the 1490s; the invasion of Charles VIII of France initiated
7524-520: The ancient Romans , who conquered the Mediterranean world during the Roman Republic and ruled it for centuries during the Roman Empire . With the spread of Christianity, Rome became the seat of the Catholic Church and the Papacy . Between late antiquity and the Early Middle Ages , Italy experienced the arrival of Germanic tribes and the fall of the Western Roman Empire . By the 11th century, Italian city-states and maritime republics expanded, bringing renewed prosperity through commerce and laying
7656-405: The collapse of the Fascist regime on 25 July. Mussolini was deposed and arrested by order of King Victor Emmanuel III. On 8 September, Italy signed the Armistice of Cassibile , ending its war with the Allies. The Germans, with the assistance of Italian fascists, succeeded in taking control of north and central Italy. The country remained a battlefield, with the Allies moving up from the south. In
7788-412: The eponymous geographical region , is located in Southern Europe (and is also considered part of Western Europe ) between latitudes 35° and 47° N , and longitudes 6° and 19° E . To the north, from west to east, Italy borders France, Switzerland, Austria, and Slovenia, and is roughly delimited by the Alpine watershed , enclosing the Po Valley and the Venetian Plain . It consists of the entirety of
7920-406: The ninth-largest nominal GDP in the world, the second-largest manufacturing industry in Europe, and plays a significant role in regional and global economic, military, cultural, and diplomatic affairs. Italy is a founding and leading member of the European Union, and is part of numerous international institutions, including NATO , the G7 and G20 , the Latin Union and the Union for
8052-413: The order 10 ). For an object with well-defined fixed separation points, like a circular disk with its plane normal to the flow direction, the drag coefficient is constant for Re > 3,500. The further the drag coefficient C d is, in general, a function of the orientation of the flow with respect to the object (apart from symmetrical objects like a sphere). Under the assumption that
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#17328586043188184-437: The political upheavals that characterised the early 19th century. The first adoption of the Italian tricolour by an Italian state, the Cispadane Republic , occurred during Napoleonic Italy , following the French Revolution, which advocated national self-determination . This event is celebrated by Tricolour Day . The birth of the Kingdom of Italy was the result of efforts of Italian nationalists and monarchists loyal to
8316-401: The 1400s and 1500s, Italy was the birthplace and heart of the Renaissance . This era marked the transition from the medieval period to the modern age and was fostered by the wealth accumulated by merchant cities and the patronage of dominant families. Italian polities were now regional states effectively ruled by princes, in control of trade and administration, and their courts became centres of
8448-500: The Adriatic or Tyrrhenian Sea. The longest is the Po , which flows from the Alps on the western border, and crosses the Padan plain to the Adriatic. The Po Valley is the largest plain, with 46,000 km (18,000 sq mi), and contains over 70% of the country's lowlands . The largest lakes are, in descending size: Garda (367.94 km or 142 sq mi), Maggiore (212.51 km or 82 sq mi), and Como (145.9 km or 56 sq mi). The climate
8580-567: The Alps form most of its northern boundary, where Italy's highest point is located on the summit of Mont Blanc ( Monte Bianco ) at 4,810 m (15,780 ft). Other well-known mountains include the Matterhorn ( Monte Cervino ) in the western Alps, and the Dolomites in the eastern Alps. Many parts of Italy are of volcanic origin . Most small islands and archipelagos in the south are volcanic islands . There are active volcanoes: Mount Etna in Sicily (the largest in Europe), Vulcano , Stromboli , and Vesuvius . Most rivers of Italy drain into
8712-552: The Alps to 12 °C (54 °F) in Sicily; so, average summer temperatures range from 20 °C (68 °F) to over 25 °C (77 °F). Winters can vary widely with lingering cold, foggy, and snowy periods in the north, and milder, sunnier conditions in the south. Summers are hot across the country, except at high altitude, particularly in the south. Northern and central areas can experience strong thunderstorms from spring to autumn. Aerodynamic drag In fluid dynamics , drag , sometimes referred to as fluid resistance ,
8844-403: The Balkans. Italian war crimes included extrajudicial killings and ethnic cleansing by deportation of about 25,000 people—mainly Yugoslavs—to Italian concentration camps and elsewhere. Yugoslav Partisans perpetrated their own crimes against the ethnic Italian population during and after the war, including the foibe massacres . An Allied invasion of Sicily began in July 1943, leading to
8976-449: The Church and new political dynasties. In 1453, despite activity by Pope Nicholas V to support the Byzantines, the city of Constantinople fell to the Ottomans . This led to the migration of Greek scholars and texts to Italy, fuelling the rediscovery of Greek humanism . Humanist rulers such as Federico da Montefeltro and Pope Pius II worked to establish ideal cities , founding Urbino and Pienza . Pico della Mirandola wrote
9108-434: The EU. Between 2013 and 2018, it took in over 700,000 migrants, mainly from sub-Saharan Africa, which put a strain on the public purse and led to a surge in support for far-right or euro-sceptic parties. After the 2018 general election , Giuseppe Conte became prime minister of a populist coalition . With more than 155,000 victims, Italy was one of the countries with the most deaths in the COVID-19 pandemic and one of
9240-461: The First World War in 1915 with the aim of completing national unity, so it is also considered the Fourth Italian War of Independence, from a historiographical perspective, as the conclusion of the unification of Italy . Italy, nominally allied with German and the Austro-Hungarian empires in the Triple Alliance , in 1915 joined the Allies , entering World War I with a promise of substantial territorial gains that included west Inner Carniola ,
9372-423: The Italian Front, secured dissolution of the Austro-Hungarian Empire, and was instrumental in ending the war less than two weeks later. During the war, more than 650,000 Italian soldiers and as many civilians died, and the kingdom was on the brink of bankruptcy. The Treaty of Saint-Germain-en-Laye (1919) and Treaty of Rapallo (1920) allowed for annexation of Trentino Alto-Adige , the Julian March , Istria ,
9504-474: The Mediterranean . As a cultural superpower , Italy has long been a renowned global centre of art , music , literature , cuisine , fashion , science and technology , and the source of multiple inventions and discoveries . It has the highest number of World Heritage Sites ( 60 ) and is the fifth-most visited country in the world. Hypotheses for the etymology of Italia are numerous. One theory suggests it originated from an Ancient Greek term for
9636-571: The National Fascist Party organised a mass demonstration and the " March on Rome " coup . King Victor Emmanuel III appointed Mussolini as prime minister, transferring power to the fascists without armed conflict. Mussolini banned political parties and curtailed personal liberties, establishing a dictatorship. These actions attracted international attention and inspired similar dictatorships in Nazi Germany and Francoist Spain . Fascism
9768-735: The Papacy, with city-states siding with the former ( Ghibellines ) or with the latter ( Guelphs ) for momentary advantage. The Germanic emperor and Roman pontiff became the universal powers of medieval Europe. However, conflict over the Investiture Controversy and between Guelphs and Ghibellines ended the imperial-feudal system in the north, where cities gained independence. In 1176, the Lombard League of city-states, defeated Holy Roman Emperor Frederick Barbarossa , ensuring their independence. City-states—e.g. Milan , Florence, Venice —played
9900-479: The aircraft's top speed proved to be only 131 km/h (81 mph). When Caproni had completed initial testing, the Regia Aeronautica took control of the plane and transferred it to Guidonia Montecelio for a brief series of further test flights. All test pilots reported that the plane was extremely stable in flight, to the point where it was difficult to change course; test pilots were also astounded by
10032-598: The aircraft, essentially applying Bernoulli's principle of fluid movements to make the aircraft's propeller more efficient. This is a similar principle as is used in turbofan engines but used a piston engine to drive the compressor/propeller rather than a gas turbine . Stipa later became convinced that German rocket and jet technology (especially the V-1 flying bomb ) was using his patented invention without giving proper credit, although his ducted fan design had little mechanically in common with turbojet engines and nothing at all with
10164-413: The airflow and forces the flow to move downward. This results in an equal and opposite force acting upward on the wing which is the lift force. The change of momentum of the airflow downward results in a reduction of the rearward momentum of the flow which is the result of a force acting forward on the airflow and applied by the wing to the air flow; an equal but opposite force acts on the wing rearward which
10296-407: The airplane produces lift, another drag component results. Induced drag , symbolized D i {\displaystyle D_{i}} , is due to a modification of the pressure distribution due to the trailing vortex system that accompanies the lift production. An alternative perspective on lift and drag is gained from considering the change of momentum of the airflow. The wing intercepts
10428-560: The arts and sciences. These princedoms were led by political dynasties and merchant families, such as the Medici of Florence. After the end of the Western Schism , newly elected Pope Martin V returned to the Papal States and restored Italy as the sole centre of Western Christianity. The Medici Bank was made the credit institution of the Papacy, and significant ties were established between
10560-453: The case of a wing , the reference areas are the same, and the drag force is in the same ratio as the lift force . Therefore, the reference for a wing is often the lifting area, sometimes referred to as "wing area" rather than the frontal area. For an object with a smooth surface, and non-fixed separation points (like a sphere or circular cylinder), the drag coefficient may vary with Reynolds number Re , up to extremely high values ( Re of
10692-811: The controls. Each flight covered about 600 metres (660 yards) and reached an altitude of approximately 6 metres (20 feet), with Wolff reporting that the replica was very stable in flight and performed much as the Italian test pilots reported that the original aircraft had 69 years to the month earlier. The replica may never have flown again and is now on static display at Toowoomba City Aerodrome in Australia. Data from NACA Technical Memorandum No. 753 : Stipa Monoplane with Venturi Fuselage, Aeroplani Caproni: Gianni Caproni and His Aircraft, 1910–1983 General characteristics Performance Italy – in Europe (light green & dark grey) – in
10824-669: The definition of parasitic drag . Parasite drag is often expressed in terms of a hypothetical. This is the area of a flat plate perpendicular to the flow. It is used when comparing the drag of different aircraft For example, the Douglas DC-3 has an equivalent parasite area of 2.20 m (23.7 sq ft) and the McDonnell Douglas DC-9 , with 30 years of advancement in aircraft design, an area of 1.91 m (20.6 sq ft) although it carried five times as many passengers. Lift-induced drag (also called induced drag )
10956-699: The development of the motorjet -powered Caproni Campini N.1 . The test flights of the Stipa-Caproni also sparked much academic interest, and resulted in Stipa's work being studied in France, Germany, Italy, and the United Kingdom, and by the National Advisory Committee for Aeronautics in the United States. France designed — but never constructed — an advanced night bomber based on
11088-678: The drag coefficient C D {\displaystyle C_{\rm {D}}} as a function of Bejan number and the ratio between wet area A w {\displaystyle A_{\rm {w}}} and front area A f {\displaystyle A_{\rm {f}}} : C D = 2 A w A f B e R e L 2 {\displaystyle C_{\rm {D}}=2{\frac {A_{\rm {w}}}{A_{\rm {f}}}}{\frac {\mathrm {Be} }{\mathrm {Re} _{L}^{2}}}} where R e L {\displaystyle \mathrm {Re} _{L}}
11220-487: The drag coefficient approaches 24 R e {\displaystyle {\frac {24}{Re}}} ! In aerodynamics , aerodynamic drag , also known as air resistance , is the fluid drag force that acts on any moving solid body in the direction of the air's freestream flow. Alternatively, calculated from the flow field perspective (far-field approach), the drag force results from three natural phenomena: shock waves , vortex sheet, and viscosity . When
11352-616: The drag constant: b = 6 π η r {\displaystyle b=6\pi \eta r\,} where r {\displaystyle r} is the Stokes radius of the particle, and η {\displaystyle \eta } is the fluid viscosity. The resulting expression for the drag is known as Stokes' drag : F D = − 6 π η r v . {\displaystyle \mathbf {F} _{D}=-6\pi \eta r\,\mathbf {v} .} For example, consider
11484-659: The emergence of Christianity as a world religion, are among the many legacies of Roman dominance. After the fall of the Western Roman Empire , Italy fell under the Odoacer's kingdom , and was seized by the Ostrogoths . Invasions resulted in a chaotic succession of kingdoms and the supposed " Dark Ages ". The invasion of another Germanic tribe in the 6th century, the Lombards, reduced Byzantine presence and ended political unity of
11616-446: The empire, homeland of the Romans and territory of the capital. As Roman provinces were being established throughout the Mediterranean, Italy maintained a special status which made it domina provinciarum ('ruler of the provinces'), and—especially in relation to the first centuries of imperial stability — rectrix mundi ('governor of the world') and omnium terrarum parens ('parent of all lands'). The Roman Empire
11748-693: The end of the Italian wars between France and the Habsburgs, about half of Italy (the southern Kingdoms of Naples , Sicily , Sardinia , and the Duchy of Milan ) was under Spanish rule, while the other half remained independent (many states continued to be formally part of the Holy Roman Empire). The Papacy launched the Counter-Reformation , whose key events include: the Council of Trent (1545–1563); adoption of
11880-415: The engine's efficiency as Stipa had calculated, and the additional lift provided by the airfoil shape of the interior of the duct itself allowed a very low landing speed of only 68 km/h (42 mph) and assisted the Stipa-Caproni in achieving a higher rate of climb than other aircraft with similar power and wing loading . The placement of the rudder and elevators in the exhaust from the propeller wash at
12012-602: The entire peninsula south of the Alps. In 264 BC, Roman Italy extended from the Arno and Rubicon rivers of the centre-north to the entire south. The northern area, Cisalpine Gaul , considered geographically part of Italy, was occupied by Rome in the 220s BC, but remained politically separated. It was legally merged into the administrative unit of Italy in 42 BC. Sardinia, Corsica , Sicily, and Malta were added to Italy by Diocletian in 292 AD, which made late-ancient Italy coterminous with
12144-411: The flow-field, present in the wake of a lifting body, derive from the turbulent mixing of air from above and below the body which flows in slightly different directions as a consequence of creation of lift . With other parameters remaining the same, as the lift generated by a body increases, so does the lift-induced drag. This means that as the wing's angle of attack increases (up to a maximum called
12276-441: The fluid is not moving relative to the currently used reference system, the power required to overcome the aerodynamic drag is given by: P D = F D ⋅ v = 1 2 ρ v 3 A C D {\displaystyle P_{D}=\mathbf {F} _{D}\cdot \mathbf {v} ={\tfrac {1}{2}}\rho v^{3}AC_{D}} The power needed to push an object through
12408-448: The forces acting on the object beyond drag): 1 m ∑ F ( v ) − ρ A C D 2 m v 2 = d v d t . {\displaystyle {\frac {1}{m}}\sum F(v)-{\frac {\rho AC_{D}}{2m}}v^{2}={\frac {dv}{dt}}.\,} For a potato-shaped object of average diameter d and of density ρ obj , terminal velocity
12540-615: The former Austrian Littoral , and Dalmatia , as well as parts of the Ottoman Empire . The country's contribution to the Allied victory earned it a place as one of the " Big Four " powers. Reorganisation of the army and conscription led to Italian victories. In October 1918, the Italians launched a massive offensive, culminating in victory at the Battle of Vittorio Veneto . This marked the end of war on
12672-578: The groundwork for modern capitalism. The Italian Renaissance flourished during the 15th and 16th centuries and spread to the rest of Europe. Italian explorers discovered new routes to the Far East and the New World , contributing significantly to the European Age of Discovery . After centuries of political and territorial divisions, Italy was almost entirely unified in 1861, following wars of independence and
12804-671: The kingdom's capital was moved from Turin to Florence. In 1866, Victor Emmanuel II, allied with Prussia during the Austro-Prussian War , waged the Third Italian War of Independence , which resulted in Italy annexing Venetia . Finally, in 1870, as France abandoned Rome during the Franco-Prussian War , the Italians captured the Papal States , unification was completed, and the capital moved to Rome. Sardinia's constitution
12936-634: The land of the Italói , a tribe that resided in the region now known as Calabria . Originally thought to be named Vituli , some scholars suggest their totemic animal to be the calf ( Latin : vitulus ; Umbrian : vitlo ; Oscan : Víteliú ). Several ancient authors said it was named after a local ruler Italus . The ancient Greek term for Italy initially referred only to the south of the Bruttium peninsula and parts of Catanzaro and Vibo Valentia . The larger concept of Oenotria and "Italy" became synonymous, and
13068-513: The leading edge of the tube and the propeller, and the best rate of revolution of the propeller. Finally, he petitioned the Italian Fascist government to produce a prototype aircraft. The government, seeking to showcase Italian technological achievement — particularly in aviation — contracted the Caproni company to construct the aircraft in 1932. The resultant aircraft
13200-552: The maritime republics, eager to find an alternative route to the Indies to bypass the Ottomans, offered their services to monarchs of Atlantic countries and played a key role in ushering the Age of Discovery and colonization of the Americas. The most notable were: Christopher Columbus , who opened the Americas for conquest by Europeans; John Cabot , the first European to explore North America since
13332-437: The midpoint of the fuselage. The aircraft had low, fixed, spatted main landing gear and a tailwheel. It was painted in a blue-and-cream scheme of the type used on racing aircraft of the day, and its rudder bore the colours of the Italian flag . The Stipa-Caproni first flew on 7 October 1932 with Caproni company test pilot Domenico Antonini at the controls. Initial testing showed that the intubed propeller design did increase
13464-571: The modern Italian geographical region . The Latin Italicus was used to describe "a man of Italy" as opposed to a provincial , or one from the Roman province . The adjective italianus , from which Italian was derived, is from medieval Latin and was used alternatively with Italicus during the early modern period . After the fall of the Western Roman Empire , the Ostrogothic Kingdom of Italy
13596-420: The monarchy and established an oligarchic republic. The Italian Peninsula, named Italia , was consolidated into a unified entity during Roman expansion, the conquest of new territories often at the expense of the other Italic tribes , Etruscans , Celts , and Greeks . A permanent association, with most of the local tribes and cities, was formed, and Rome began the conquest of Western Europe, North Africa, and
13728-510: The most affected economically . In February 2021, after a government crisis , Conte resigned. Mario Draghi , former president of the European Central Bank , formed a national unity government supported by most main parties, pledging to implement an economic stimulus to face the crisis caused by the pandemic. In 2022, Giorgia Meloni was sworn in as Italy's first female prime minister. Italy, whose territory largely coincides with
13860-621: The name applied to most of Lucania as well. Before the Roman Republic's expansion, the name was used by Greeks for the land between the strait of Messina and the line connecting the gulfs of Salerno and Taranto , corresponding to Calabria. The Greeks came to apply "Italia" to a larger region. In addition to the " Greek Italy " in the south, historians have suggested the existence of an "Etruscan Italy", which consisted of areas of central Italy. The borders of Roman Italy , Italia , are better established. Cato's Origines describes Italy as
13992-597: The north, the Germans set up the Italian Social Republic (RSI), a Nazi puppet state and collaborationist regime with Mussolini installed as leader after he was rescued by German paratroopers. What remained of the Italian troops was organised into the Italian Co-belligerent Army , which fought alongside the Allies, while other Italian forces, loyal to Mussolini, opted to fight alongside the Germans in
14124-749: The object. One way to express this is by means of the drag equation : F D = 1 2 ρ v 2 C D A {\displaystyle F_{\mathrm {D} }\,=\,{\tfrac {1}{2}}\,\rho \,v^{2}\,C_{\mathrm {D} }\,A} where The drag coefficient depends on the shape of the object and on the Reynolds number R e = v D ν = ρ v D μ , {\displaystyle \mathrm {Re} ={\frac {vD}{\nu }}={\frac {\rho vD}{\mu }},} where At low R e {\displaystyle \mathrm {Re} } , C D {\displaystyle C_{\rm {D}}}
14256-408: The others based on speed. The combined overall drag curve therefore shows a minimum at some airspeed - an aircraft flying at this speed will be at or close to its optimal efficiency. Pilots will use this speed to maximize endurance (minimum fuel consumption), or maximize gliding range in the event of an engine failure. Drag depends on the properties of the fluid and on the size, shape, and speed of
14388-399: The patriotic journalist Giuseppe Mazzini , founder of the political movement Young Italy in the 1830s, who favoured a unitary republic and advocated a broad nationalist movement. 1847 saw the first public performance of " Il Canto degli Italiani ", which became the national anthem in 1946. The most famous member of Young Italy was the revolutionary and general Giuseppe Garibaldi who led
14520-517: The peninsula. The north formed the Lombard kingdom, central-south was also controlled by the Lombards, and other parts remained Byzantine. The Lombard kingdom was absorbed into Francia by Charlemagne in the late 8th century and became the Kingdom of Italy. The Franks helped form the Papal States . Until the 13th century, politics was dominated by relations between the Holy Roman Emperors and
14652-569: The pulsejet used on the V-1. Stipa spent years studying the idea mathematically while working in the Engineering Division of the Italian Ministry of Air Force , eventually determining that the venturi tube's inner surface needed to be shaped like an airfoil in order to achieve the greatest efficiency. He also determined the optimum shape of the propeller, the most efficient distance between
14784-469: The republican drive for unification in southern Italy. However, the Italian monarchy of the House of Savoy, in the Kingdom of Sardinia , whose government was led by Camillo Benso, Count of Cavour , also had ambitions of establishing a united Italian state. In the context of the 1848 liberal revolutions that swept Europe, an unsuccessful First Italian War of Independence was declared against Austria . In 1855, Sardinia became an ally of Britain and France in
14916-463: The south, Sicily had become an Arab Islamic emirate in the 9th century, thriving until the Italo-Normans conquered it in the late 11th century, together with most of the Lombard and Byzantine principalities of southern Italy. The region was subsequently divided between the Kingdom of Sicily and Kingdom of Naples . The Black Death of 1348 killed perhaps a third of Italy's population. During
15048-808: The speed, the work (resulting in displacement over a fixed distance) is done twice as fast. Since power is the rate of doing work, 4 times the work done in half the time requires 8 times the power. When the fluid is moving relative to the reference system, for example, a car driving into headwind, the power required to overcome the aerodynamic drag is given by the following formula: P D = F D ⋅ v o = 1 2 C D A ρ ( v w + v o ) 2 v o {\displaystyle P_{D}=\mathbf {F} _{D}\cdot \mathbf {v_{o}} ={\tfrac {1}{2}}C_{D}A\rho (v_{w}+v_{o})^{2}v_{o}} Where v w {\displaystyle v_{w}}
15180-880: The square of the speed at low Reynolds numbers, and as the cube of the speed at high numbers. It can be demonstrated that drag force can be expressed as a function of a dimensionless number, which is dimensionally identical to the Bejan number . Consequently, drag force and drag coefficient can be a function of Bejan number. In fact, from the expression of drag force it has been obtained: F d = Δ p A w = 1 2 C D A f ν μ l 2 R e L 2 {\displaystyle F_{\rm {d}}=\Delta _{\rm {p}}A_{\rm {w}}={\frac {1}{2}}C_{\rm {D}}A_{\rm {f}}{\frac {\nu \mu }{l^{2}}}\mathrm {Re} _{L}^{2}} and consequently allows expressing
15312-407: The stalling angle), the lift coefficient also increases, and so too does the lift-induced drag. At the onset of stall , lift is abruptly decreased, as is lift-induced drag, but viscous pressure drag, a component of parasite drag, increases due to the formation of turbulent unattached flow in the wake behind the body. Parasitic drag , or profile drag, is drag caused by moving a solid object through
15444-482: The terminal velocity v t = ( ρ − ρ 0 ) V g b {\displaystyle v_{t}={\frac {(\rho -\rho _{0})Vg}{b}}} . For a given b {\displaystyle b} , denser objects fall more quickly. For the special case of small spherical objects moving slowly through a viscous fluid (and thus at small Reynolds number), George Gabriel Stokes derived an expression for
15576-405: The traditional liberal and conservative establishment. In the last two decades of the 19th century, Italy developed into a colonial power by subjugating Eritrea , Somalia , Tripolitania , and Cyrenaica in Africa. In 1913, male universal suffrage was adopted. The pre- World War I period was dominated by Giovanni Giolitti , prime minister five times between 1892 and 1921. Italy entered into
15708-436: The trailing edge of the tube gave the aircraft handling characteristics that made it very stable in flight, although they later were enlarged to further improve the plane's handling characteristics. The Stipa-Caproni proved to be noticeably quieter than conventional aircraft of the time. Unfortunately, the intubed propeller design also induced so much aerodynamic drag that the benefits in engine efficiency were cancelled out, and
15840-489: The velocity function is defined in terms of the hyperbolic cotangent function: v ( t ) = v t coth ( t g v t + coth − 1 ( v i v t ) ) . {\displaystyle v(t)=v_{t}\coth \left(t{\frac {g}{v_{t}}}+\coth ^{-1}\left({\frac {v_{i}}{v_{t}}}\right)\right).\,} The hyperbolic cotangent also has
15972-473: The very low landing speed and the consequent very short landing run. As the plane did not perform noticeably better than conventional aircraft designs, the Regia Aeronautica decided to cancel further development. No further prototypes were built. Stipa himself never had intended his intubed propeller to be employed on single-engine aircraft like the Caproni-Stipa — which he viewed merely as
16104-523: The world and headquarters of the worldwide Catholic Church under the governance of the Holy See ) are enclaves within Italy, while Campione d'Italia is an Italian exclave in Switzerland. The border with San Marino is 39 km (24 mi) long, that with Vatican City, 3.2 km (2.0 mi). Over 35% of Italian territory is mountainous. The Apennine Mountains form the peninsula's backbone, and
16236-500: The world's fifth-largest industrial nation after it gained entry into the G7 in the 1970s. However, national debt skyrocketed past 100% of GDP. Between 1992 and 1993, Italy faced terror attacks perpetrated by the Sicilian Mafia as a consequence of new anti-mafia measures by the government. Voters—disenchanted with political paralysis, massive public debt and extensive corruption uncovered by
16368-416: Was a mid-wing monoplane of mostly wooden construction dubbed the Stipa-Caproni or Caproni Stipa. The fuselage was a barrel-like tube, short and fat, open at both ends to form the tapered duct, with twin open cockpits in tandem mounted in a hump on top of it. The wings were elliptical and passed through the duct and the engine nacelle inside it. The duct itself had a profile similar to that of the airfoils, and
16500-422: Was among the largest in history, wielding great economical, cultural, political, and military power. At its greatest extent, it had an area of 5 million square kilometres (1.9 million square miles). The Roman legacy has deeply influenced Western civilisation shaping the modern world. The widespread use of Romance languages derived from Latin, numerical system , modern Western alphabet and calendar, and
16632-506: Was based upon Italian nationalism and imperialism, seeking to expand Italian possessions via irredentist claims based on the legacy of the Roman and Venetian empires. For this reason the fascists engaged in interventionist foreign policy . In 1935, Mussolini invaded Ethiopia and founded Italian East Africa , resulting in international isolation and leading to Italy's withdrawal from the League of Nations . Italy then allied with Nazi Germany and
16764-516: Was captured and summarily executed by partisans. Hostilities ended on 29 April 1945, when the German forces in Italy surrendered . Nearly half a million Italians died in the conflict, society was divided, and the economy all but destroyed—per capita income in 1944 was at its lowest point since 1900. The aftermath left Italy angry with the monarchy for its endorsement of the Fascist regime, contributing to
16896-710: Was conducive to academic and artistic advancement. The best-known maritime republics were Venice, Genoa , Pisa , and Amalfi . Each had dominion over overseas lands, islands, lands on the Adriatic, Aegean, and Black seas, and commercial colonies in the Near East and North Africa. Venice and Genoa were Europe's gateways to the East, and producers of fine glass, while Florence was a centre of silk, wool, banking, and jewellery. The wealth generated meant large public and private artistic projects could be commissioned. The republics participated in
17028-700: Was created. After the Lombard invasions, Italia was retained as the name for their kingdom, and its successor kingdom within the Holy Roman Empire . Lower Paleolithic artefacts, dating back 850,000 years, have been recovered from Monte Poggiolo . Excavations throughout Italy revealed a Neanderthal presence in the Middle Palaeolithic period 200,000 years ago, while modern humans appeared about 40,000 years ago at Riparo Mochi . The ancient peoples of pre-Roman Italy were Indo-European , specifically
17160-662: Was discovered in the Similaun glacier in 1991. The first colonisers were the Phoenicians , who established emporiums on the coasts of Sicily and Sardinia. Some became small urban centers and developed parallel to Greek colonies . During the 8th and 7th centuries, Greek colonies were established at Pithecusae , eventually extending along the south of the Italian Peninsula and the coast of Sicily, an area later known as Magna Graecia . Ionians , Doric colonists, Syracusans , and
17292-496: Was extended to all of Italy in 1861, and provided basic freedoms for the new state; but electoral laws excluded the non-propertied classes. The new kingdom was governed by a parliamentary constitutional monarchy dominated by liberals. As northern Italy quickly industrialised, southern and northern rural areas remained underdeveloped and overpopulated, forcing millions to migrate and fuelling a large and influential diaspora . The Italian Socialist Party increased in strength, challenging
17424-411: Was not interested in pursuing development of the Stipa-Caproni, its design influenced the development of jet propulsion . Stipa's basic idea, which he called the " intubed propeller ", was to mount the engine and propeller inside a fuselage that itself formed a tapered duct, or venturi tube , and compressed the propeller's airflow and the engine exhaust before it exited the duct at the trailing edge of
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