The Franklin O-335 (company designations variations on 6A and 6V) was an American air-cooled aircraft engine of the 1940s. The engine was of six-cylinder, horizontally-opposed layout and displaced 335 cuin. The power output of later variants was 225 hp.

Design and development

These engines were commonly vertically mounted and used to power many early helicopters in the United States. They were closely related to the 2A4 and 4A4 2- and 4-cylinder engines. In various subtypes, the 6A4 remained in continuous production from 1945 to the time Franklin's United States 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 that he purchased the Aircooled Motors/Franklin Engine Company, and it remained under the ownership of the Tucker family until 1961.

Variants

Applications

• Aero-Flight Streak • Aeronca Sedan • Bartlett Zephyr • Bell 47 • Bell H-13 Sioux • Bellanca Cruisair • Brantly B-1 • Goodyear Duck • Hiller H-23 Raven • Hiller 360 • Hirth Acrostar • HTM Skytrac • Maule M-5-220C Lunar Rocket • Republic RC-3 Seabee • Seibel S-4 • Sikorsky S-52 • Socata MS.894 Rallye Minerva • Stinson Voyager • Sznycer SG-VI • Taylorcraft 15 • Temco TE-1B • Tucker (automobile) • Temco YT-35 Buckaroo

Specifications (6AL-335 / 6A4-150-B3)