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Ivchenko AI-26 : ウィキペディア英語版
Ivchenko AI-26

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The Ivchenko AI-26 is a seven-cylinder air-cooled radial engine used in early Russian helicopters and later used in light utility aircraft.
==Design and development==
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 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 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.

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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