1940 ? 2010: Brief history of hybrid helicopters around ... - Eurocopter

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All Rights Reserved American Helicopter Society Summer 2006 vertiflite 1978-1988 RSRA: Sikorsky, USA • Research aircraft used to study different types of rotors (Rotor System Research Aircraft) and equipped with a wing and additional propulsion • S-61 five-bladed standard rotor • S-61 standard tail rotor • 13-meter-span wing • Two 1040 kW General Electric T58-GE-5 turbo-shaft engines • Two 4400 daN thrust General Electric TF34-GE-400A jet engines for the propulsion • Maiden flight of the compound version on April 10, 1978 • The S-72 RSRA is one of the few compound helicopters that was not made in view of high speeds
All Rights Reserved American Helicopter Society Summer 2006 vertiflite 1978-1980 XH-59A: Sikorsky, USA • XH-59A (Sikorsky S69) demonstrator, manufactured to study the ABC (Advancing Blade Concept) rotor which, in its compound version, was equipped with additional jet engines • Two 12-meter-diameter ABC rigid counter-rotating rotors • Two 1400 kW Pratt & Whitney PT-6T-3 TwinPack turbo-shaft engines • Two 1300 daN thrust Pratt & Whitney J60-P-3A jet engines for the propulsion • Maiden flight: end of 1978
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1940 ? 2010: Brief history of hybrid helicopters around ... - Eurocopter

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