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 1940s.

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

Franklin 4AC-150 fitted to a Piper J-3 Cub

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

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

Data from [2]

General characteristics

Components

Performance

See also

Related development


Related lists

Notes

  1. "Franklin, Aircooled Motors, Doman-Marks (US); Franklin Aircraft Engines, WSK-PZL (Poland) Part 1: Introduction and O-110 through O-300".
  2. Wilkinson, Paul H. (1945). Aircraft Engines of the world 1945. New York: Paul H. Wilkinson. pp. 88–89.

References

Further reading

External links

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