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Franklin 4 series / 4A
Franklin O-150 / O-170 / O-175 / O-200 / O-225 / O-235
Franklin Sport 4

PZL F 4A

 

  Frank-O200
Franklin O-200

 

The Franklin 4 (US military designations O-150, O-170, O-175, O-200, O-225 and O-235) was a series of air-cooled aircraft engines of flat-4 configuration produced in the 1930s and 40s. The 4AC was first run in 1938.

 

Frank-4A-01
Franklin Sport 4A 125hp

 

Variants:
4A4-75
4A4-85
4A4-95
4A4-100
4AC

4AC-150 / O-150
4AC-150-40 - 40 hp (30 kW) at 1,875 rpm
4AC-150-50 - 50 hp (37 kW) at 2,300 rpm
4AC-150-A - 60 hp (45 kW) at 2,400 rpm

4AC-171  / O-170
60 hp (45 kW) at 2,350 rpm

4AC-176 / O-175
4AC-176-B - 65 hp (48 kW) at 2,200 rpm
4AC-176-BA (O-175-1) - 65 hp (48 kW) at 2,300 rpm
4AC-176-C - 75 hp (56 kW) at 2,500 rpm
4AC-176-D - 80 hp (60 kW) at 2,650 rpm
4AC-176-F - 80 hp (60 kW) at 2,500 rpm

4ACG-176 / O-175

4AC-199 / O-200
4AC-199-B - 65 hp (48 kW) at 1,950 rpm
4AC-199-D - 85 hp (63 kW) at 2,500 rpm
4AC-199-E (O-200-1) - 90 hp (67 kW) at 2,500 rpm
4AC-199-H (O-200-5) - 113 hp (84 kW) at 3,500 rpm

4ACG-199 / O-200

4A-225 / O-225
4AL-225 / O-225
4A-235 / O-235
Sport 4 / O-235

PZL F 4A

 

Frank-4A-02
Franklin Sport 4A 125hp

 

Applications
Aeronca 50 Chief
Aeronca Arrow
Culver Cadet
Falconar F11 Sporty
Fetterman Chickadee
Goodyear Duck
Interstate Cadet
Langley Twin
Payne MC-7
Piasecki PV-2
Piper Cub
Piper PA-7
Porterfield Collegiate
Rearwin Skyranger
Rose Parakeet
Sackett Jeanie
Stinson Voyager 10A
Stout Skycar II
Taylorcraft BF and L-2
Vought-Sikorsky VS-300

 

Specifications:

4AC-176-BA2, O-175-1
Type: 4-cylinder air-cooled horizontally opposed aircraft piston engine
Bore: 4 in (102 mm)
Stroke: 3.5 in (89 mm)
Displacement: 176 cu in (2.88 l)
Length: 28.6 in (726 mm)
Width: 30.2 in (767 mm)
Height: 20 in (508 mm)
Dry weight: 182 lb (82.6 kg)
Valvetrain: OHV, 1x inlet valve, 1x exhaust valve operated by pushrods
Fuel system: 1x Marvel-Schebler MA-3P updraught carburettor
Fuel type: 73 Octane gasoline
Oil system: 40 S.U. secs (4.3 cs) grade pressure fed at 40 psi (275,790 Pa), wet sump
Cooling system: Air-cooled
Power output: 65 hp (48.5 kW) at 2,300 rpm for take-off
Specific power: 0.37 hp/in³ (16.837 kW/l)
Compression ratio: 6:1
Specific fuel consumption: 0.49 lb/hp/hr (0.298 kg/kW/hr, 220 US.gal/hp/hr) cruising
Oil consumption: 0.003 lb/hp/hr (0.0018 kg/kW/hr, 1.4 US.gal/hp/hr) cruising
Power-to-weight ratio: 0.357 hp/lb (0.587kW/kg)

 

 


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