Franklin O-425

The Franklin O-425 (company designation 6AG/6V6) was an American air-cooled aircraft engine that first ran in the mid-1940s. The engine was of six-cylinder, horizontally-opposed layout and displaced 425 cuin. The power output was between 240 hp and 285 hp depending on variant. The O-405-13 (6V6-300-D16FT) of 1955 was a vertically mounted, turbocharged and fan cooled version for helicopters.

Variants

 * 6AG6-245:Geared propeller drive at 0.623:1, 245 hp at 3,300 rpm, (XO-425-5).


 * 6AGS6-245:Supercharged and geared, 250 hp at 3,200 rpm, (XO-425-3).


 * 6V6-245-B16F:Vertically mounted, fan-cooled helicopter version, 245 hp at 3,275 rpm, (XO-425-1).


 * 6V6-300-D16FT:Vertically mounted, turbocharged, fan-cooled helicopter version, 285 hp at 3,275 rpm, (O-425-13).


 * O-425-1:


 * O-425-2:


 * O-425-3:


 * O-425-5:


 * O-425-9:


 * O-425-13:

Applications

 * Convair XL-13
 * Republic YOA-15 (intended)
 * Sikorsky S-52
 * Sikorsky YH-18
 * Stinson L-13