Platt-LePage XR-1
 The Platt-LePage XR-1 also known by the company designation PL-3 was an early American twin-rotor helicopter built by the Platt-LePage Aircraft Company of Eddystone Pennsylvania. The winner of a United States Army Air Corps design competition held in early 1940 the XR-1 was the first helicopter tested by the USAAF flying in 1941.