The Righter/Kiekhaefer O-45 was an air-cooled, two-stroke aircraft engine of flat-twin configuration, used extensively for powering target drones in the late 1940s.
[1] Designed by the Righter Manufacturing Company, the O-45 was also built by the Kiekhaefer Corporation and the Menasco Motors Company.
[2] Data from [2] Related lists