This pulsejet, which was similar to the more famous German V-1 of World War II, powered a U.S. Navy Katydid target drone, also built by the McDonnell Aircraft Corporation between 1946-1947. The drone could be either air-launched or fired from a AT-1 catapult on land.
Katydid was usually carried on the bomb racks of a PB4Y Catalina aircraft, and was parachute-recovered for re-use. The endurance of the drone was about 0.7 hours. Its maximum speed was 280 km/hr (175 miles per hour).
This object is not on display at the National Air and Space Museum. It is either on loan or in storage.