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Aviation History
1956
1956 - 1572.PDF
730 FLIGHT, 2 November 1956 Helicopters of the World ... the pilots' compartment can readily be re-moved to provide access to the main gear- box and flight controls. The rear 10ft ofthe fuselage (which is swept up to form a stabilizing fin) can be folded forwardagainst the remainder of the structure, thus reducing the hull length to about 37ft(this feature was- originally incorporated to ease stowage problems aboard carriers withthe HSS-1). There is also a small fixed, stabilizing tailplane. • Rotor diam., 56ft; fuselage length, 47ft 2in;empty weight (with standard equipment), 7,530 lb; max. weight, 13,000 lb; max, speed ats.l., 132 m.p.h.; cruising speed, 104 m.p.h.; max. climb at s.l. at rated power, l,100ft/min;vertical s.l. climb on take-off power, 450ft/min; hovering ceiling at take-off power, withoutground effect, 2,500ft (with ground effect, 7,000ft); range with normal reserves, 270 st.miles (ferry range with auxiliary fuel, over 972 st. miles). S-59 Bearing the U.S. Army designa-tion H-39, the S-59 is a development of the earlier S-52, engined with a Turbo-meca Artouste 2 shaft turbine. In August 1954 a machine of the same type set up aspeed record of 156 m.p.h. over a 3-km course, and later in the same year attaineda height of 24,500ft. • Rotor diam., 35ft; overall length, 41ft 7in;empty weight, 2,200 lb; gross weight, 3,625 Ibj hovering ceiling in ground effect, 8,500ft;range, 288 miles. TRANSCENDENTAL AIRCRAFT CORP. Glen Riddle, Pa.(Valleybrook 2926) Model 1-G This is a single-seat con-vertiplane with rotors mounted at the wing-tips. These are tilted forward aftertake-off to propel the machine as an aero- plane. The engine is a Lycoming 0-290-Aof 160 h.p., and rotor transmission is by way of spanwise shafts to bevel gearing atthe wing-tips. A two-speed gear is in- corporated in the rotor drive to give therequired r.p.m. for vertical and forward flight. • Wing span, 21ft; fuselage length, 26ft;empty weight, 1,450 lb; gross weight, 1,750 lb; estimated max. speed as helicopter, 120 m.p.h.,as aeroplane, 160 m.p.h.; ceiling as aeroplane, 5,000ft. VERTOL AIRCRAFT CORP. . -... Morton, Pa. : (Suianhmore 6-4000) Model PD-18 Known to the U.S. Navyas the HUP Retriever and to the Army as the H-25 Army Mule, the PD-18 is a single-engined tandem-rotor helicopter. The rotors are driven by a single Continental Sikorsky S-59 (H-39). R-975 engine of 550 h.p. or—in the HUP-4—by a Wright R-1300 of 700 h.p. Typically the machine is a six-seater, with a fuselageof all-metal stressed-skin construction. Dual hydraulic controls are fitted, andthere is a large rescue hatch (48in long by 26in wide) at the forward end of the cabinin the right-hand side of the floor, near the pilot's seat. An hydraulic hoist permitspersonnel, stretchers, etc., up to 400 lb in weight to be lifted through the hatch. Theengine is fan-cooled and readily removable (Below) Verto/ PD-18 (HUP-2) Retriever. as a power package, including accessoriesand lubricating system. The HUP-2 has a Sperry automatic pilot as the primarycontroller. # Rotor diam., 35ft; overall length,56ft llin; empty weight, 3,900/4,100 lb; normal gross weight, 5,750 1b; max. grossweight, 6,100 lb; max. speed at s.l., 108 m.p.h.; hovering ceiling in ground effect, 7,000ft;range, 490 miles. Model PH-42 Another successful Vertoltwin-rotor single-engined helicopter, the PH-42 is known in the U.S.A.F., U.S.Army and R.C.A.F. as the H-21 Work Horse. The type is also being suppliedto France under the same designation. The fuselage is of all-metal, stressed-skin con-struction, and the cockpit has side-by-side seating with complete dual controls and anautomatic pilot. Cabin dimensions are 20ft long x 5ft 6in wide X 5ft 6in high,giving a capacity of 615 cu ft. The main door is on the left side at the aft end, andthere is a rescue door, with a swinging boom-like hoist, behind the pilot at theforward end. Complete winterization equipment, including cabin heating andinsulation, is standard. The H-21B is an assault transport for die U.S.A.F., withseats for 20 troops, a larger rear door and extra windows. The H-21C is a supplytransport for the U.S. Army, though it is capable of being used alternatively as atroop carrier. Rotor-blade ground clear- ance is sufficient to allow vehicles and per-sonnel to approach the machine in safety. Even with engine idling there is a clearanceof 13ft 4in. Powerplant is the Wright
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