Franklin O-335

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

 * O-335-1:Military designation of vertical installation model for helicopters :175 hp
 * O-335-3:Similar to -1 but changes in starter installation
 * O-335-5:200 hp
 * O-335-5B:200 hp
 * 6A-335:180 hp at 2,800 rpm
 * 6AL-335:150 hp at 2,600 rpm
 * 6A4-125:125 hp at 2,200 rpm
 * 6A4-130:130 hp at 2,200 rpm
 * 6A4-135:135 hp at 2,450 rpm
 * 6A4-140:140 hp at 2,375 rpm
 * 6A4-145:145 hp at 2,600 rpm
 * 6A4-150:150 hp at 2,600 rpm
 * 6A4-165:165 hp at 2,800 rpm
 * 6A4-200:200 hp at 3,100 rpm
 * 6AG-335:220 hp at 3,400 rpm
 * 6AG4-185:185 hp at 3,100 rpm
 * 6AGS-335:260 hp at 3,400 rpm
 * 6AS-335:240 hp at 3,200 rpm
 * 6V-335-B:210 hp at 3,100 rpm
 * 6V-335-A1A:200 hp at 3,100 rpm
 * 6V-335-A1B:200 hp at 3,100 rpm
 * 6V4-165:165 hp
 * 6V4-178-B32:178 hp at 3,000 rpm
 * 6V4-200-C32:200 hp at 3,100 rpm
 * 6VS-O-335:225 hp at 3,200 rpm

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