Packard 1A-1500

1A-1500
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Packard 1A-1500
Type	Liquid-cooled V-12 piston engine
Manufacturer	Packard
First run	1924
Number built	29

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)

General characteristics

• Type: 12-cylinder liquid-cooled Vee piston aircraft engine
• Bore: ​5 ³⁄₈ in (136.5 mm)
• Stroke: ​5 ¹⁄₂ in (140 mm)
• Displacement: 1,498 in³ (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: 520 hp (387.8 kW) at 2,200 rpm for takeoff
• Specific power: 0.27 hp/in³ (12.4 kW/L)
• Power-to-weight ratio: 0.53 hp/lb (0.87 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

Bibliography

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