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Aviation History
1964
1964 - 1552.PDF
FLIGHT International, 21 May 1964 VTOL AIRCRAFT 1964 857 Bell OH-I3X-2 Sioux Scout Be// Aerosystems X-22A (art/st's /mpression) X-22A Although this experimental VTOL aircraft started as a US Navy contract it is being continued under Tri-Service super- vision. The objective is to explore the pos- sibilities of ducted propellers for lift and propulsion. The X-22A has been laid out as a small transport, with two pilots and a cabin for six or a payload of 1,2001b. A chunky fuselage carries two fans forward, with a small wing aft, in the roots of which are mounted four 1,250 s.h.p. GE T58 free-turbines and, outboard of these, two more ducted fans. There is also a large fin for directional stability in forward flight. The ducted fans swivel to the vertical for lift, the rear ones taking the outer sections of the wing with them. The ducts round the four-blade propellers increase their efficiency under VTOL con- ditions and provide lifting surfaces in forward flight. Unlike most advanced pro- jects, there have been few significant alterations in this layout since first details were revealed, other than cockpit changes due to service needs. Partial deflection of the ducted fans will give STOL, to meet a requirement (at an unstated weight) for 50ft to be cleared in 600ft. The flight target date is March 1965. Span, 39ft 2in; length, 36ft 4in; height, 16ft 4in; max weight appnx IS.OOOIb; empty approx 10,5001b; max sp«d, 32Skt; cruise, 250kt; hover ceiling o.g.e., 6,000ft; endurance, with 10 min. hover, 2hr. Bell Helicopter Company PO Box 482, Fort Worth 1, Texas Model 47G-4 Nearly 3,000 Bell 47 helicopters have been built since the type C of A was granted in 1946, and the 47G Trooper is now the basic version with the openwork fuselage. The new 47G-4 model has a cabin 5ft wide internally, with new bucket seats, and the 260 h.p. Lycoming VO-546-B1B3 with" a high-inertia rotorw "ich gives improved hot weather perform- ance, efficient operation from sea level to 11,000ft, more payload and greater range. Rotor dia, 37ft 2m; fuselage length, 31ft Tin; height, 9 .,'"•' mo» weight, 2,950/b; empty, 1,7771b; max speed, o ,»' ?Ur'^ 7'kt; max ctimb- 630ftlmin; hover ceiling, •* ' 4"5°0ft; max range, 280 n.m. Model 47G-3B-1 This differs from the Y-4 m having a Lycoming TVO-435-B1A with the AiResearch T-ll exhaust-driven supercharger which maintains the rated power of 270 s.h.p. up to 15,000ft. Max weight, 2,9501b; empty, IJ94lb; max speed, 9/kt; cruise, 8/kt; max climb, 850ft/min; hover ceiling o.g.e., 12,750ft: max range, 240 n.m. OH-13S Sioux Military version of the 47G-3B, of which the US Army has ordered over 280, with deliveries continuing into 1965. The total of the OH-13 series bought by the US Army is now over 1,650. 47J-2A This new Ranger, with covered engine and tail boom, is an advance over the 1963 47J-2, with greater rotor inertia and improved special executive interiors. In utility form the three-seat rear bench can be folded up to give space for freight or two stretchers. The engine is the 260 h.p. Lycoming VO-540-B1B3. Rotor dia, 37ft lin; fuselage length, 32ft 5in; height, 9ft 4in; max weight, 2,9501b; empty, 1,7621b; max speed, 9/kt; max cruise, 90kt; max climb, BOOftjmin; hover ceiling o.g.e., 4,000ft; max range, 250 n.m. Wing Ding A 25ft-span wing has been fitted to a Bell 47G as part of the company's research into V/STOL problems. It has flown successfully but no data or results have been released. OH-13X-2 Sioux Scout This aircraft, which flew last September, was evolved from the 47, incorporating Wing Ding experience, to explore the possibilities of an armed Army light helicopter. It has a well-streamlined fuselage, much narrower than usual, seating the pilot above and behind the observer. Beneath the latter is a power-operated twin- machine-gun turret. A stubby, tapered high wing off-loads the rotor, so improving climb and manoeuvrability. Lateral-slot intakes supply combustion and cooling air to the 260 h.p. Lycoming TVO-435. The skid undercarriage has streamlined legs. UH-1B Iroquois For three years this general-purpose ten-seater (Model 204/205) has been in production for the US Army. It was originally powered by the 950 s.h.p. Lycoming T53-L-5, but is now fitted with the 1,100 s.h.p. T53-L-11. The Iroquois is of stressed-skin construction, with a wide fuselage and typical two-bladed Bell rotor and rigid skid undercarriage. It is in use with the RAAF and is on active service for close-support in Vietnam. Armament evaluation is being carried out by the US Army with 16 Iroquois each armed with six Nord AS.l 1 on booms, or 48 2.75in rockets, or the Ford 40mm-grenade launch- er. The civil Model 204B gained its Cof A in April 1963. A research version of the UH-1B, the Bell 533 achieved a speed of 182kt in level flight during measured trials last January 17. The aircraft was modified by the addition of two Continental J69 turbojets each giving 1,2601b thrust and only 780 s.h.p. was taken from the T53 engine driving the rotor. Tip speed of the advancing rotor blades reached Mach 0.95. This aircraft has been stream- lined and has a tilting rotor pylon. A future development will be to fit winglets to unload the rotor for higher speeds. Rotor dia, 44ft; fuselage length, 39ft Bin; height, 14ft 7in; max weight, 8,5001b; normal, 6,5001b- empty UH-IB, 4,3701b; 204B, 4,6001b; max speed, l20kt; economical cruise, 6,5O0lb, I lOkt, 8,5001b, IO4kt; max climb, 6.5001b. 2,350ft/min, 8,J00/b, /.600ft/min; hover ceiling, 6,5001b, /2,500ft, 8,5O0lb, 2,400ft; range 200- 220 n.m. Bell Model 533 (UH-IB Iroquois with two 1,260lb-thrust J69 turbojets)
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