ThePackard 1A-1500 was an American 12-cylinder liquid-cooled 60-degreeVee piston aircraft engine designed in 1924.^[1] Test flown in the second prototypeDouglas XO-2, it proved to be unreliable. Only 29 engines were built.

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

Data from STATISTICS OF ALL THE AERO ENGINES OF PACKARD^[2]

• 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 in³ (24.5 L)
• Dry weight: 720 lb (326.5 kg)

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

• 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)

• Packard 1A-2500

Comparable engines

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

Related lists

• List of aircraft engines

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