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
Sikorsky Memorial Airport Sikorsky Memorial Airport Igor I. Sikorsky Memorial Airport is a public airport in Fairfield County, Connecticut, owned by the city of Bridgeport. It is three miles (6 km) southeast of downtown, in the town of Stratford. It was formerly "Bridgeport Municipal Airport". It is included in the Federal Aviation Administration (FAA) National Plan of Integrated Airport Systems for 2017–2021, in which it is categorized as a national general aviation facility. It has three Fixed-Base Operators (FBO's) and several private hangars. In 2016, Tailwind Air Service initiated seaplane service between Sikorsky and the New York Skyports Seaplane Base in central Manhattan.