Franklin O-405

The Franklin O-405 (company designation 6AC-403) was an American air-cooled aircraft engine of the 1940s. The engine was of six-cylinder, horizontally-opposed layout and displaced 405 cuin. The power output was between 200 hp and 250 hp depending on variant. The O-405-9 (6ACV-403) was a vertically mounted, fan cooled version for helicopters.

Variants

 * 6AC-403 (XO-405-1):200 hp at 2,750 rpm


 * 6ACSA-403 (XO-405-3):Supercharged, 220 hp at 2,750 rpm


 * 6ACGSA-403 (O-405-5): Supercharged, geared propeller drive at 0.632:1. 250 hp at 3,200 rpm


 * 6ACV-403 (O-405-9):Vertically mounted, fan-cooled helicopter version, 245 hp at 3,275 rpm

Applications

 * Culver XPQ-15
 * Doman LZ-1A
 * Doman Pelican
 * Fairchild XUC-86B
 * Fleetwings XBQ-1
 * Kellett XR-8
 * Sikorsky R-6