Franklin 4AC

The Franklin 4AC (US military designations O-150, O-170, O-175, and O-200) was a series of air-cooled aircraft engines of flat-4 configuration produced in the 1930s and 40s.

Variants

* 4AC-150 (O-150) - 40 hp (30 kW) at 1,875 rpm
* 4AC-171 (O-170) - 60 hp (45 kW) at 2,350 rpm
* 4AC-176 (O-175) - 65 hp (50 kW) at 2,300 rpm (models B, C), 80 hp (60 kW) at 2,500 rpm (models D, F)
* 4AC-199 (O-200) - 90 hp (67 kW) at 2,500 rpm (direct drive), 113 hp (60 kW) at 3,500 rpm (geared)

Applications

* Aeronca 50 Chief
* Aeronca Arrow
* Culver Cadet
* Fetterman Chickadee
* Goodyear Duck
* Interstate Cadet
* Langley Twin
* Payne MC-7
* Piasecki PV-2
* Piper Cub
* Piper PA-7
* Porterfield Collegiate
* Rearwin Skyranger
* Rose Parrakeet
* Sackett Jeanie
* Stinson 10
* Stout Skycar II
* Taylorcraft BF and L-2
* Vought-Sikorsky VS-300

pecifications (4AC-199, O-200)

pistonspecs

type=4-cylinder air-cooled horizontally opposed aircraft piston engine
bore=4.25 in (108 mm)
stroke=3.5 in (89 mm)
displacement=199 in³ (3.3 L)
length=
diameter=
width=
height=
weight=190 lb (86 kg)
valvetrain=
supercharger=
turbocharger=
fuelsystem=
fueltype=
oilsystem=
coolingsystem=Air-cooled
power=65 hp (50 kW) at 2,500 rpm
specpower=
compression=
fuelcon=
specfuelcon=
oilcon=
power/weight=

References

* Gunston, Bill. (1986) "World Encyclopedia of Aero Engines". Patrick Stephens: Wellingborough. p.57
* Erickson, Jack. " [http://home.adelphia.net/~aeroengine/ Horizontally-Opposed Piston Aero Engines] "