The Franklin O-300 (company designation 6AC-298) was an American air-cooled aircraft engine of the early 1940s. The engine was of six-cylinder, horizontally-opposed layout and displaced . The power output ranged between and depending on variant. The 6ACG-298 featured a geared propeller drive. An enlarged displacement version was known as the O-315, 6A3 or 6AL-315.

Variants

O-300

;6AC-298: ;6AC-298-F3 (O-300-1): at 2,600 rpm ;6ACT-298: at 3,000 rpm ;6ACT-298-J4 (O-300-3): at 2,930 rpm ;6ACT-298-35 (O-300-11): at 2,930 rpm ;6ACG-298-P5 (O-300-9):Geared propeller drive 0.63:1, at 3,200 rpm ;6ACTS-298:Supercharged, at 3,200 rpm ;6ACTS-298-K4 (O-300-7):Supercharged, at 3,000 rpm ;6ACV-298:Vertical installation for helicopters, at 3,250 rpm

O-315 (6A3)

;6AL-315: ;6ALG-315:

Applications

Direct drive

* Aeronautical Products A-1 * Aeronautical Products A-3 * CNNA HL-6 * Culver XPQ-9 * Culver XPQ-14, YPQ-14A, XPQ-15 *

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* Bellanca T-14 * Erco XPQ-13 *

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* Hockaday Comet *

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Geared drive

* Culver PQ-14 Cadet * Republic RC-1 Thunderbolt (O-315)

Supercharged

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twin-engine conversion)

Specifications (6AC-298)

References

;Notes ;Bibliography * Gunston, Bill. (1986) ''World Encyclopedia of Aero Engines''. Patrick Stephens: Wellingborough. p. 57 {{US military piston aeroengines Franklin aircraft engines 1940s aircraft piston engines Boxer engines