The Shvetsov ASh-21 is a seven-cylinder single-row air-cooled radial aero engine.
3-565: The Ivchenko AI-26 is a seven-cylinder air-cooled radial engine used in early Soviet helicopters and later used in light utility aircraft. The AI-26 engine was designed by A.G Ivchenko in 1945 with the early designation M-26, later the designation was changed to AI-26. Like the Shvetsov ASh-21 which is basically one bank of cylinders from the Shvetsov ASh-82 , the AI-26 was also influenced by
6-636: The ASh-82. The AI-26 retained the bore, stroke and displacement of the ASh-21 while incorporating new features peculiar to its role. This similarity allowed the AI-26 to use the same production jigs as the ASh-21 and ASh-82 which reduced costs and simplified production. The engine was envisioned as a helicopter engine, but the early test models lacked the necessary equipment to facilitate this role, such as an auxiliary cooling fan, reduction gears and clutch. The GR suffix means "Gelikopter" , or helicopter. Engine testing
9-609: Was completed by early 1946 and by 1947 helicopter testing had begun. In late 1947 the decision to mass-produce the engine was made and production commenced at factory No.478 located in Zaporizhia . Between 1947 and the 1970s some 1,300 AI-26GR's were produced. The AI-26V model was also produced in Poland during the 1960s as the LiT-3 and later as the PZL-3S . Shvetsov ASh-21 The ASh-21
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