The Curtiss D-12, sometimes identified with the military designation Curtiss V-1150, was an aero engine of 18.8 litres capacity. It was a water-cooled V12, producing 443 hp (330 kW) and weighing 693 lb (314 kg). It was designed by Arthur Nutt in 1921 and used in the Curtiss CR-3 for the 1923 Schneider Trophy race.