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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 cu in (5 L). The power output ranged between 130 hp (97 kW) and 175 hp (130 kW) depending on variant. The 6ACG-298 featured a geared propeller drive.

O-300/6AC-298
Type	Piston aircraft engine
National origin	United States
Manufacturer	Franklin Engine Company
First run	1941

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)

130 hp (97 kW) at 2,600 rpm

6ACT-298

150 hp (112 kW) at 3,000 rpm

6ACT-298-J4 (O-300-3)

150 hp (112 kW) at 2,930 rpm

6ACT-298-35 (O-300-11)

150 hp (112 kW) at 2,930 rpm

6ACG-298-P5 (O-300-9)

Geared propeller drive 0.63:1, 160 hp (119 kW) at 3,200 rpm

6ACTS-298

Supercharged, 160 hp (119 kW) at 3,200 rpm

6ACTS-298-K4 (O-300-7)

Supercharged, 175 hp (130 kW) at 3,000 rpm

6ACV-298

Vertical installation for helicopters,160 hp (119 kW) at 3,250 rpm

O-315 (6A3)

6AL-315

175 hp (130 kW)

6ALG-315

175 hp (130 kW)

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)

Data from ^{[citation needed]}

General characteristics

• Type: 6-cylinder air-cooled horizontally opposed aircraft piston engine
• Bore: 4.25 in (108 mm)
• Stroke: 3.5 in (88.9 mm)
• Displacement: 297.9 in³ (4.88 L)
• Dry weight: 260 lb (118 kg)

Components

• Cooling system: Air-cooled

Performance

• Power output: 130 hp (97 kW) at 2,600 rpm

See also

Comparable engines

• Continental O-300

Related lists

• List of aircraft engines

References

Notes

Bibliography

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