Franklin O-405 Explained

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 405abbr=onNaNabbr=on. The power output was between 200abbr=onNaNabbr=on and 250abbr=onNaNabbr=on depending on variant. The O-405-9 (6ACV-403) was a vertically mounted, fan cooled version for helicopters.

Variants

6AC-403 (XO-405-1):200abbr=onNaNabbr=on at 2,750 rpm

6ACSA-403 (XO-405-3):Supercharged, 220abbr=onNaNabbr=on at 2,750 rpm

6ACGSA-403 (O-405-5): Supercharged, geared propeller drive at 0.632:1. 250abbr=onNaNabbr=on at 3,200 rpm

6ACV-403 (O-405-9):Vertically mounted, fan-cooled helicopter version, 245abbr=onNaNabbr=on at 3,275 rpm

Applications

• Culver XPQ-15
  • Doman LZ-1A Doman Pelican
• Fairchild XUC-86B
• Fleetwings XBQ-1
• Kellett XR-8
• Sikorsky R-6

References

Notes

Bibliography

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