Franklin O-335

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The Franklin O-335 (company designations variations on 6A and 6V) was an American air-cooled aircraft engine of the 1940s. The engine was of six-cylinder, horizontally-opposed layout and displaced Script error: No such module "convert".. The power output of later variants was Script error: No such module "convert"..

Design and development

These engines were commonly vertically mounted and used to power many early helicopters in the United States. They were closely related to the 2A4 and 4A4 2- and 4-cylinder engines. In various subtypes, the 6A4 remained in continuous production from 1945 to the time Franklin's United States operations ceased in 1975, with versions continuing in Polish production into the 1990s.

In 1947 this engine was modified into a water-cooled version by the Tucker Car Corporation for use in the 1948 Tucker Sedan. Tucker liked the engine so much that he purchased the Aircooled Motors/Franklin Engine Company, and it remained under the ownership of the Tucker family until 1961.

Variants

O-335-1
Military designation of vertical installation model for helicopters :Script error: No such module "convert".
O-335-3
Similar to -1 but changes in starter installation
O-335-5
Script error: No such module "convert".
O-335-5B
Script error: No such module "convert".
6A-335
Script error: No such module "convert". at 2,800 rpm
6AL-335
Script error: No such module "convert". at 2,600 rpm
6A4-125
Script error: No such module "convert". at 2,200 rpm
6A4-130
Script error: No such module "convert". at 2,200 rpm
6A4-135
Script error: No such module "convert". at 2,450 rpm
6A4-140
Script error: No such module "convert". at 2,375 rpm
6A4-145
Script error: No such module "convert". at 2,600 rpm
6A4-150
Script error: No such module "convert". at 2,600 rpm
6A4-165
Script error: No such module "convert". at 2,800 rpm
6A4-200
Script error: No such module "convert". at 3,100 rpm
6AG-335
Script error: No such module "convert". at 3,400 rpm
6AG4-185
Script error: No such module "convert". at 3,100 rpm
6AGS-335
Script error: No such module "convert". at 3,400 rpm
6AS-335
Script error: No such module "convert". at 3,200 rpm
6V-335-B
Script error: No such module "convert". at 3,100 rpm
6V-335-A1A
Script error: No such module "convert". at 3,100 rpm
6V-335-A1B
Script error: No such module "convert". at 3,100 rpm
6V4-165
Script error: No such module "convert".
6V4-178-B32
Script error: No such module "convert". at 3,000 rpm
6V4-200-C32
Script error: No such module "convert". at 3,100 rpm
6VS-O-335
Script error: No such module "convert". at 3,200 rpm

Applications

File:Stahls Automotive Collection December 2021 144 (1948 Tucker Sedan engine).jpg
A Franklin O-335 in a Tucker 48 at Stahls Automotive Collection

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Specifications (6AL-335 / 6A4-150-B3)

File:FranklinO335Engine2.JPG
Franklin O-335/6AC Engine.

Data from Wilkinson [1]

General characteristics

  • Type: 6-cylinder air-cooled horizontally opposed direct drive supercharged aircraft piston engine
  • Bore: Script error: No such module "convert".
  • Stroke: Script error: No such module "convert".
  • Displacement: Script error: No such module "convert".
  • Length: Script error: No such module "convert".
  • Width: Script error: No such module "convert".
  • Height: Script error: No such module "convert".
  • Dry weight: Script error: No such module "convert".

Components

  • Valvetrain: OHV, 1 x inlet valve, 1 x exhaust valve operated by pushrods
  • Supercharger: Mechanically driven supercharger
  • Fuel system: 1x Marvel-Schebler MA-3SPA updraught carburettor
  • Fuel type: 80 Octane gasoline
  • Oil system: 80 S.U. secs (15.6 cSt) grade pressure fed at Script error: No such module "convert"., wet sump
  • Cooling system: Air-cooled
  • Delco-Remy direct cranking electric starter motor

Performance

  • Power output:
  • (Take-off): Script error: No such module "convert". at 2,600 rpm
  • (Normal): Script error: No such module "convert". at 2,600 rpm at sea level
  • (Cruising): Script error: No such module "convert". at 2,350 rpm at sea level
  • Specific power: 0.45 hp/(cu in) (20.35 kW/L)
  • Compression ratio: 7:1
  • Specific fuel consumption: 0.51 lb/(hp h) (0.311 kg/(kW h) cruising, 4.5 US gal/(hp h)) cruising
  • Oil consumption: 0.01 lb/(hp h) (0.006 kg/(kW h)
  • Power-to-weight ratio: 0.488 hp/lb (0.8 kW/kg)
  • B.m.e.p.: Script error: No such module "convert".

See also

Comparable engines

Related lists

Notes

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  1. ↑ Script error: No such module "citation/CS1".

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References

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  • Gunston, Bill. (1986) World Encyclopedia of Aero Engines. Patrick Stephens: Wellingborough. p. 57
  • Erickson, Jack. Horizontally Opposed Piston Aero Engines
  • Script error: No such module "citation/CS1".
  • US Department of Transportation Federal Aviation Administration Type Certificate Data Sheet E-238 Revision 12, December 8, 1994.

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