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Franklin 4 series

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Franklin 4 series

4AC
Franklin O-200 at the Hiller Aviation Museum
Type Flat-4
Manufacturer Franklin Engine Company
First run 1938

The Franklin 4 (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

Data from:[1]

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
60 hp (45 kW) at 2,350 rpm - (O-170)
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
O-150
military designation
O-170
military designation
O-175
military designation
O-200
military designation
O-225
military designation
O-235
military designation

Applications


Specifications (4AC-176-BA2, O-175-1)

(4AC-176-BA3 identical except for electric starter and generator)

Data from [2]

General characteristics

  • 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)

Components

  • 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

Performance

  • 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)

See also

Related development
  • Franklin 2 series
  • Franklin 4 series
  • Franklin 6 series
  • Franklin 8 series
  • Franklin 12 series
  • Franklin O-335
  • Franklin O-805

Related lists

Notes

References

Further reading

  • Gunston, Bill. (1986) World Encyclopedia of Aero Engines. Patrick Stephens: Wellingborough. p. 57

External links

  • A table showing the relationship of the military models
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