Platt Le page XR1/XR1A

In 1937, two engineers, Laurence LePage and Haviland Platt, traveled to Germany to view the Focke FA-61 tandem-rotor helicopter. There they obtained an option to build the Focke helicopter in U.S., but deteriorating conditions between two governments prevented the deal from going through. After returning to the U.S., they formed Platt LePage Aircraft Co. and started to develop their own tandem-rotor design, the PL-1. This new aircraft interested ithe USAAF, which advised Platt LaPage to enter a military helicopter competition. The PL-1 was redesigned to meet military needs and was given the new rotary wing category's first designation, XR-1. The first flight of the XR-1 was made in 1941. Control system problems caused numerous delays. Modifications were made and a second prototype, the XR-1A, was constructed. Its performance proved to be far superior to the XR-1. However, in 1944, the Sikorsky XR-4 was named the winner of the USAAF helicopter competition. USAAF cancelled all contracts with Platt LePage, which resulted in the company's closing. Platt LePage subsequently sold their twin rotor design to McDonnell, resulting in the XHJD-1 Whirlaway.