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Since 21 May 1965 Sikorsky has been testing the S-61F compound helicopter, an SH-3A with a new, streamlined fuselage, fully retractable undercarriage, swivelling tail rotor and 9.75m span wings supporting two 1350kg Pratt & Whitney J60 podded jet engines. This aircraft has already reached a level speed of 390km/h. K.Munson "Helicopters And Other Rotorcraft Since 1907", 1968
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Officially listed as an HSS-2, the U.S. Navy's BuNo. 148033 was actually a Sikorsky S-61F compound research helicopter sponsored by the Army and Navy. The aircraft had two pod-mounted Pratt 8 Whitney J60-P-2 turbojets to complement the two General Electric T58-GE-8B turboshafts, a 9.75m wingspan, and the five-bladed rotor shown here was later replaced by a six-bladed rotor. First flight as a compound helicopter was on 21 May 1965. Engine ratings were 1315kg each for the J60s and 1,200 shp each for the T58s. Norman Polmar, Floyd D. Kennedy, Jr. "Military Helicopters", 1985
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