S-35 Sikorsky s-35 Background



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S-35


Sikorsky S-35

Background
The Sikorsky S-35 model was a 3 engine sesquiplane designed specifically in 1926 to try to win the $25,000 Orteig prize for the first nonstop flight from New York to Paris. The original design was a 2 engine transport but it was redesigned to the 3 engine configuration while still in the drawing phase of development.

Drawing of original S-35 two engine transport
Igor Sikorsky knew that a successful crossing would, with the world wide press coverage, generate much interest in Sikorsky designed airplanes and increase sales. Capt. Rene Fonck, a World War One Ace and hero, was chosen by the buyers (Argonauts Inc.) to fly the trans-Atlantic flight
The S-35 was completed on August 21, 1926 and had its first test by ground taxiing. This test proved that the airplane had full rigidity but required an air pressure adjustment on the left wheel and a reduction of the rubber doughnuts on the tail skid shock absorber. The first flight was made on August 23, 1926 with a duration of 35 minutes. A second flight was made the same day with a flight over New York City. The aircraft proved satisfactory in every way and no modifications were made to the aircraft after this date. Three additional test flights were conducted: A speed test on August 27, 1926, an altitude test on August 28, 1926, and a load test on September 7, 1926. A flight was made from Roosevelt Field on September 9, 1926 to Bolling Field, Washington D.C. and return on September 10th. The purpose of the flight was to test fuel consumption and navigation equipment. In Washington, a demonstration flight was made for representatives of the Bureau of Aeronautics with Bureau Chief, Commander H.C. Richardson at the controls. Another flight was made for U.S. Army pilots.

During the 23 test flights of the S-35 ten different expert pilots from the U.S. Navy, U.S. Army, and Sikorsky and all unanimously expressed the opinion that the plane was exceptionally light on the controls and had remarkable maneuverability and stability in the air including flights with only one side motor operating. Several of the expert pilots expressed the opinion that the easiness on the controls of the S-35 was more characteristic of a pursuit type plane than a heavy multiengine plane.


A video entitled “Sikorsky S-35: The plane that should have beat Lindberg” showing the S-35 in flight is available on line.

https://www.youtube.com/watch?v=3gJKLpQDOKI


S-35 in transatlantic flight configuration



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