Franklin O-175

The Franklin O-175 (company designation 4AC-176) was an American air-cooled aircraft engine of the 1940s. The engine was of horizontally-opposed four-cylinder and displaced 175 cu in (2.9 L). The power output was nominally 80 hp (60 kW). A later variant was designated O-180, despite sharing the same displacement.

O-175/4AC-176
Type Piston aircraft engine
National origin United States
Manufacturer Franklin Engine Company
First run 1940

A related four-cylinder engine of slightly smaller capacity was known as the O-170 or 4AC-171. It produced 60 hp (45 kW).

Variants

O-170
4AC-171
60 hp (45 kW)

O-175
4AC-176
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-180
4AC-176-F3 (O-180-1)

Applications

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

Data from Wilkinson[1]

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 cSt) 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/(cu in) (16.837 kW/L)
  • Compression ratio: 6:1
  • Specific fuel consumption: 0.49 lb/(hp h) (0.298 kg/(kW h), 220 US gal/(hp h)) cruising
  • Oil consumption: 0.003 lb/(hp h) (0.0018 kg/(kW h), 1.4 US gal/(hp h)) cruising
  • Power-to-weight ratio: 0.357 hp/lb (0.587 kW/kg)
gollark: Removal of the atmosphere *would* have many advantages.
gollark: The outdoor rocks might be far away, or too wet or something, or not at the level of difficulty you want.
gollark: It does say to do warm-ups. Just that stretching isn't an effective one. I will have to investigate further or something.
gollark: I see.
gollark: I found the thing I read in my browser history (https://www.painscience.com/articles/stretching.php), and it says that stretching hasn't been found to reduce injury risk, and might just make the brain happier with using more range of motion without actually changing the muscles.

See also

Related lists

References
Notes
  1. Wilkinson, Paul H. (1945). Aircraft Engines of the world 1945. New York: Paul H. Wilkinson. pp. 88–89.
Bibliography
  • Gunston, Bill. (1986) World Encyclopedia of Aero Engines. Patrick Stephens: Wellingborough. p. 57
This article is issued from Wikipedia. The text is licensed under Creative Commons - Attribution - Sharealike. Additional terms may apply for the media files.