Franklin O-805

The Franklin O-805 (company designation 12AC) was an American air-cooled aircraft piston engine, designed in the mid-1940s and was to be used in radio-controlled pilotless drones that were to be guided from an accompanying control plane. Due to project requirement changes and cancellations the engine was not produced.

A smaller displacement 12-cylinder Franklin engine of 1941 was known as the O-595 or 12AC-596.

O-805

 * 12AC-806:450 hp0
 * 12ACG-806 (XO-805-1):456 hp at 3,200 rpm, geared to 0.632:1.
 * 12ACGSA-806 (XO-805-3 and O-805-5):500 hp at 3,200 rpm, supercharged and geared to 0.632:1 (XO-805-3), or to 0.587:1 (O-805-5).

O-595

 * 12AC-596:300 hp at 2,600 rpm


 * 12ACG-596:350 hp at 3,500 rpm

Applications (intended)

 * Interstate XBQ-5
 * Interstate XTD2R-1

Survivors

 * There is an O-805-2 on display at the New England Air Museum, Bradley International Airport, Windsor Locks, CT
 * One surfaced and was sold privately in August, 2016, on eBay for US$8500.