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Aviation History
1956
1956 - 1576.PDF
734 ; FLIGHT, 2 November 1956 Helicopters of the World ... : of the Soviet Mi-1, and all parts, exceptengines, which will be imported from the U.S.S.R., will be Polish-made. Series pro-duction is to begin next year. The first SM-ls will be principally used for thetraining of pilots. The 575-h.p. engine will give a top speed of about 125 m.p.h.,ceiling will be about 16,000ft and range 200 miles. The cabin is to be heated andthe blades will have de-icing equipment. Next year, an ambulance version will beproduced, and an agricultural version is also in view. BZ-4 Zuk This new "automaticallystabilized" helicopter was shown for the first time during the Polish Aviation Dayexhibition on August 25 last. A design of B. Zurakowski, who was also responsiblefor the earlier Polish GIL helicopter, the BZ-4 is powered by a Polish engine.Development is in hand and production is intended. A photograph appears on thispage. Swidnik Projects The Swidnik worksare designing a twin-turbine helicopter to carry about twenty passengers. Miniaturesingle-seat helicopters are also in prospect. Above, HC-2. Right, Kolibrie H-3. 0 Rotor diam., 32.8ft; empty weight, 1,166 lb; gross weight, 1,650 lb; max. speed, 96 m.p.h.; cruising range, 200 miles. aii up weignt ratio and the low fuel priceas common household kerosine is used. Production of the first series will start in1956. Export will be possible at the end of 1957." N ETHERLAN DS SPAI N CZECHOSLOVAKIA CENTRAL BOHEMIAN WORKS HC-2 Powered by a Praga D engine of80 h.p., this little two-seat helicopter is claimed to fly roughly twenty miles to thegallon. The second seat can be removed to make way for luggage, freight or astretcher. Speed (regime unspecified) 80 m.p.h.;ceiling, 10,000ft; "load capacity," 420 lb. JAPAN TOKYO KIKAIKA KOGYO CO. Tokyo. Yomiuri Y-l Sponsored by one of the"big three" Japanese newspapers—the Yomiuri—this Bell-like two-seater ispowered by a Hitachi Jinpu III seven- cylinder radial of 150 h.p. NEDERLANDSE HELICOPTER INDUSTRIE N.V. Vliegveld Zestienhoven, Rotterdam. Kolibrie H-3 The H-3 is described byits designer as the prototype of the pro- duction version and has been flying sinceMay this year. This machine differs from the original prototype H-2 mainly in hav-ing a much cleaner fuselage. The two- blade rotor is turned by tip-mounted ram-jets each with its separate fuel supply. In a letter to Flight the chief designer writes:"The design offers the operator a utility aircraft that quickly can be changed fordifferent tasks. A second seat can be attached to the left side; the number oftanks can be varied depending on the required range; agricultural equipment,litters, a hook, a closed cabin and other special equipment are being developed byN.H.I. The H-3, having a minimum empty weight of 450 lb, has recently flownunder overload conditions at an all-up weight of 1,550 lb. Design a.u.w. is1,325 lb. Important features are the twin- engined layout with separate fuel supply,the extreme high inertia rotor and a very low disc loading, enabling the pilot tomake very fast jumps and to overcome critical situations. The usual dangerousheight area does not exist at all. The air- craft has proved to be stable and can bedown a considerable time without touch- ing cyclic, collective and rudder controls.The low operating costs are due to the low initial price and the extreme sim-plicity. There are fifteen times less parts compared with piston-engined helicoptersof equal payload. High fuel consumption is compensated by the high payload/ Below, Yomiuri Y-l. Above right, BZ-4 Zuk. Lower right, Aerotecnica AC-14. AEROTECNICA S.A. Carrera de San Jeronimo 40, Madrid. AC-14 Six of these interesting machinesare under construction. A Turbomeca Artouste II is mounted above the cabin(as was the piston engine of the AC-12), and five passengers will be carried in ashapely soundproofed cabin. Residual thrust will be used in cruising flight toincrease forward speed, leaving the mov- able tail fins to provide all anti-torque anddirectional control. A full and exclusive account of Aero-tecnica helicopter activities by a member of Flight's staff appeared in our issue ofFebruary 24 this year. • Empty weight, 1,210 lb; gross weight,2,640 lb; max. speed, 109 m.p.h.; cruising speed, 78 m.p.h.; hovering ceiling with groundeffect, 11,800ft; hovering ceiling without ground effect, 7,600ft; max. rate of climb,l,200ft/min; service ceiling, 24,000ft.
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