Franklin O-405

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O-405/6AC-403
Type Piston aircraft engine
National origin United States
Manufacturer Franklin Engine Company
First run 1942

The Franklin O-405 (company designation 6AC-403) was an American air-cooled aircraft engine of the 1940s. The engine was of six-cylinder, horizontally-opposed layout and displaced 405 cu in (6.64 L). The power output was between 200 hp (149 kW) and 250 hp (186 kW) depending on variant. The O-405-9 (6ACV-403) was a vertically mounted, fan cooled version for helicopters.

Variants[]

6AC-403 (XO-405-1)
200 hp (149 kW) at 2,750 rpm
6ACSA-403 (XO-405-3)
Supercharged, 220 hp (164 kW) at 2,750 rpm
6ACGSA-403 (O-405-5)
Supercharged, geared propeller drive at 0.632:1. 250 hp (186 kW) at 3,200 rpm
6ACV-403 (O-405-9)
Vertically mounted, fan-cooled helicopter version, 245 hp (183 kW) at 3,275 rpm

Applications[]

Specifications (6AC-403/XO-405-1)[]

Data from[citation needed]

General characteristics

  • Type: 6-cylinder air-cooled horizontally opposed aircraft piston engine
  • Bore: 4.625 in (117.5 mm)
  • Stroke: 4.0 in (101.6 mm)
  • Displacement: 403.2 in³ (6.6 L)
  • Dry weight: 405 lb (184 kg)

Components

  • Cooling system: Air-cooled

Performance

  • Power output: 200 hp (149 kW) at 2,750 rpm

See also[]

Comparable engines

Related lists

References[]

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