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The Packard 1A-1500 was an American 12-cylinder liquid-cooled 60-degree Vee piston aircraft engine designed in 1924. Test flown in the second prototype Douglas XO-2, it proved to be unreliable. Only 29 engines were built.

Applications

• Boeing Model 15
• Boeing XP-4
• Curtiss Falcon
• Douglas XO-2
• Loening OL

Specifications (1A-1500)

Data from STATISTICS OF ALL THE AERO ENGINES OF PACKARD

General characteristics

• Type: V-12 liquid-cooled piston aircraft engine
• Bore: 5+3⁄8 in (136.5 mm)
• Stroke: 5+1⁄2 in (139.7 mm)
• Displacement: 1,498 in (24.5 L)
• Dry weight: 720 lb (326.5 kg)

Components

• Valvetrain: Four valves per cylinder, overhead camshaft
• Cooling system: Liquid-cooled

Performance

• Power output: 500 hp (370 kW) at 2,000 rpm maximum continuous;520 hp (390 kW) at 2,200 rpm for takeoff
• Specific power: 0.347 hp/cu in (15.8 kW/L)
• Power-to-weight ratio: 0.722 hp/lb (1.187 kW/kg)

See also

• Packard 1A-2500

Comparable engines

• Curtiss D-12
• Fairey Prince (V-12)
• Rolls-Royce Kestrel

Related lists

• List of aircraft engines

References

Notes

1. Gunston 1989, p.109.
2. Neal, Bob. "STATISTICS OF ALL THE AERO ENGINES OF PACKARD" (PDF). Aircrqaft Engine Historical Society. Washington D.C. Retrieved 20 January 2018.

Bibliography

• Gunston, Bill. World Encyclopedia of Aero Engines. Cambridge, England. Patrick Stephens Limited, 1989. ISBN 1-85260-163-9
• Aircraft Engine Historical Society

• 1920s aircraft piston engines
• Packard aircraft engines
• V12 aircraft engines