How many fatal S-92 Sikorsky helicopter crashes have happened in the past 10 years?”
The Sikorsky S-67 Blackhawk was a private-venture, prototype attack helicopter built in 1970 with Sikorsky Aircraft R&D funds. A tandem, two-seat aircraft designed around the dynamic drive and rotor systems of the Sikorsky S-61, it was designed to serve as an attack helicopter or to transport up to 8 troops into combat. Background The US Army issued a request for proposals (RFP) for its Advanced Aerial Fire Support System (AAFSS) program on 1 August 1964.[1] Lockheed offered its CL-840 design, a rigid-rotor compound helicopter.[2] Sikorsky submitted the S-66, which featured a “Rotorprop” serving as a tail rotor but during increased speeds would rotate 90° to serve as pusher prop.[3] The S-66 featured short, fixed wings and was powered by a 3,400 shp (2,500 kW) Lycoming T55 turboshaft engine. The design was to have a speed of 200 knots (370 km/h) with the ability for 250 knots (460 km/h) for brief periods.[4] The Army awarded Lockheed and Sikorsky with contracts for further study on 19
