Franklin O-300

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-298Supercharged, at 3,200 rpm 6ACTS-298-K4 (O-300-7)Supercharged, at 3,000 rpm

6ACV-298Vertical 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 Bell 30 Bellanca T-14 Erco XPQ-13 Fleetwings 33 Hockaday Comet Piper PT-1 Troy A Zodiac Libra-Det

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

Supercharged Northwestern XPG-1 (Waco CG-4 twin-engine conversion)

Specifications (6AC-298)

Franklin O-300

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