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The Franklin 6AC (US military designation O-335) was a series of air-cooled aircraft engines of flat-6 configuration. These engines were commonly vertically-mounted and used to power many early helicopters in the US. They were closely related to the 2A4 and 4AC 2- and 4-cylinder engines. In various subtypes, the 6AC remained in continuous production from 1945 to the time Franklin's US operations ceased in 1975, with versions continuing in Polish production into the 1990s.
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- Gunston, Bill. (1986) World Encyclopedia of Aero Engines. Patrick Stephens: Wellingborough. p.57
- Erickson, Jack. Horizontally-Opposed Piston Aero Engines
- US Department of Transportation Federal Aviation Administration Type Certificate Data Sheet E-238 Revision 12, December 8, 1994.
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It uses material from the Wikipedia article "Franklin 6A".