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| The Sikorsky-designed R-6A two-seat observation helicopter was a refined version of the R-4, the first Air Force helicopter to serve in a combat zone (May 1944). First flown in October 1943, the R-6A used the same rotor and transmission system as the R-4 (HNS-1), but had a more powerful engine. The fuselage was completely redesigned to reduce air resistance and provide improved pilot visibility; therefore, the R-6A bore little resemblance to its boxy-looking predecessor. Sikorsky built the first six of the helicopters (one XR-6 and five XR-6As) in addition to 219 R-6As that were produced in 1944-1945 by Nash-Kelvinator under a Sikorsky License. The R-6B version was scheduled for Lycoming O-435-7 engine, but production was cancelled.
Although primarily an observation and liaison helicopter, many R-6As also were equipped with capsules on each side of the fuselage to carry litters for medical evacuation. Bomb racks also could be installed, and if necessary, the R-6A could be equipped with floats for operation from water. SPECIFICATIONS: Main rotor diameter: 38 ft. Length: 38 ft. 3 in. Height: 11 ft. 7 in. Weight: 2,900 lbs. maximum Engine: One Franklin O-405-9 of 235 hp Armament: Structural provisions for 650 lbs. of bombs mounted externally PERFORMANCE: Maximum speed: 96 mph Cruising speed: 69 mph Range: 305 miles Service ceiling: 13,200 ft. |
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| Bibliography: National Museum of the USAF |