Packard 1A-1500

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