Sikorsky S-75 Sikorsky S-75 The Sikorsky S-75 was a proof-of-concept all-composite helicopter. Sikorsky Aircraft used all-composite materials to replace metal to provide greater strength, lighter weight, lower manufacturing costs, and reduce maintenance costs. The Sikorsky S-75 was developed under the US Army's Advanced Composite Airframe Program (ACAP), the goal of which was the development of an all-composite helicopter fuselage, lighter and less costly to build than predominantly metal airframes in support of the Light Helicopter Experimental (LHX) program. In February 1981, contracts were awarded to Sikorsky and Bell Helicopter, with Bell submitting its Model D292. The S-75 flew for the first time
Sikorsky S-8 fabric covering between the wing root and first rib. On the evening of 17 September 1912, Sikorsky piloted the S-8 on a ninety minute night flight from the Korpusnoi Aerodrome near Saint Petersburg. He landed with help of fires set at the airfield. Sikorsky S-8 The Sikorsky S-8 "Malyutka" (baby) was a small Russian single engine aircraft built by the Russian Baltic Railroad Car Works shortly after Igor Sikorsky became chief engineer of the aircraft manufacturing division in 1912. The S-8 was a two bay biplane trainer powered by a Gnome air-cooled rotary engine with the main wings and landing