Sikorsky R-4 end of the boom near the tail rotor while others had it positioned at the midpoint of the boom. Additionally, some had short "stub" exhaust pipes from the engine while others had a much longer one which extended vertically and then aft above the main landing gear struts. Sikorsky R-4 The Sikorsky R-4 is a two-seat helicopter designed by Igor Sikorsky with a single, three-bladed main rotor and powered by a radial engine. 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
Igor I. Sikorsky Memorial Bridge Igor I. Sikorsky Memorial Bridge The Igor I. Sikorsky Memorial Bridge (also known as the Sikorsky Memorial Bridge, and the Housatonic River Bridge) carries the limited-access Connecticut Route 15 over the Housatonic River, between Stratford and Milford, Connecticut. The first bridge, known as the Sikorsky Bridge (not to be confused with the new Igor I. Sikorsky Memorial Bridge's name), on the site, was completed in 1940, marking the completion of the Merritt Parkway and the starting point for construction of the adjoining Wilbur Cross Parkway, September 2, 1940. It featured two narrow lanes in each direction and open steel grid