This aircraft paper model is a Sikorsky R-4B Hoverfly, a variant of the Sikorsky R-4, which was a two-seat helicopter designed by Igor Sikorsky with a single, three-bladed main rotor and powered by a radial engine, the papercraft is created by Marek, and the scale is in 1:50.
The R-4 was the world's first large-scale mass-produced helicopter and the first helicopter used by the United States Army Air Forces, the United States Navy, the United States Coast Guard and the United Kingdom′s Royal Air Force and Royal Navy. In U.S. Navy and U.S. Coast Guard service, the helicopter was known as the Sikorsky HNS-1. In British service, it was known as the Hoverfly. For further information please click here.
You can download this papercraft model template here: Sikorsky R-4B Hoverfly Helicopter Free Aircraft Paper Model Download [Gavitex] [pCloud]