Franklin O-335

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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.

In 1947 this engine was modified into a water-cooled version by the Tucker Car Corporation for use in the 1948 Tucker Sedan. Tucker liked the engine so much, he purchased the Aircooled Motors/Franklin Engine Company and it remained under the ownership of the Tucker family until 1961.

Applications

• Aero-Flight Streak
• Aeronca Sedan
• Bartlett Zephyr
• Bell 47
• Bellanca Cruisair
• Brantly B-1
• Goodyear Duck
• H-23 Raven
• Hiller 360
• Hirth Acrostar
• Maule M-5-220C Lunar Rocket
• Republic RC-3 Seabee
• Seibel S-4
• Sikorsky S-52
• Socata MS.894 Rallye Minerva
• Stinson Voyager
• Taylorcraft 15
• ...... ...
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