Sikorsky S-48The Sikorsky S 48 VS 327 R 5 model was a follow on to the successful R 4 helicopter. It was designed to meet a 1942 U. S. Army Air Forces (USAAF) requirement for a larger more capable observation helicopter as well as a British requirement. The XR 5 helicopters featured a 48 foot 3 bladed fully articulated main rotor and a 3 bladed tail rotor powered by the reliable Pratt and Whitney 450 hp R985 AN 5 radial engine. The S 48 had a 2 place tandem
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