Franklin O-425
The Franklin O-425 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. The power output was between and depending on variant. The O-405-13 of 1955 was a vertically mounted, turbocharged and fan cooled version for helicopters.
Variants
;6AG6-245:Geared propeller drive at 0.623:1, at 3,300 rpm,.;6AGS6-245:Supercharged and geared, at 3,200 rpm,.
;6V6-245-B16F:Vertically mounted, fan-cooled helicopter version, at 3,275 rpm, .
;6V6-300-D16FT:Vertically mounted, turbocharged, fan-cooled helicopter version, at 3,275 rpm,.
;O-425-1:
;O-425-2:
;O-425-3:
;O-425-5:
;O-425-9:
;O-425-13: