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 300 cuin. The power output ranged between 130 hp and 175 hp 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.

O-300

 * 6AC-298:
 * 6AC-298-F3 (O-300-1):130 hp at 2,600 rpm


 * 6ACT-298:150 hp at 3,000 rpm
 * 6ACT-298-J4 (O-300-3):150 hp at 2,930 rpm
 * 6ACT-298-35 (O-300-11):150 hp at 2,930 rpm


 * 6ACG-298-P5 (O-300-9):Geared propeller drive 0.63:1, 160 hp at 3,200 rpm


 * 6ACTS-298:Supercharged, 160 hp at 3,200 rpm
 * 6ACTS-298-K4 (O-300-7):Supercharged, 175 hp at 3,000 rpm


 * 6ACV-298:Vertical installation for helicopters,160 hp at 3,250 rpm

O-315 (6A3)

 * 6AL-315:175 hp


 * 6ALG-315:175 hp

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)