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Aviation History
1956
1956 - 0445.PDF
20 April 1956 445 A "Flight" artist has prepared this cut-away drawing and three-view general-arrangement of the Mi-1 helicopter. Large numbers of these aircraft are now in service with the Russian Air Force and it is believed that the type is also used by the Soviet Navy and Aeroflot. The design seems to owe something to the work of Western engineers. Mi-1 helicopter (540 h.p. ASZ-21 seven-cylinder radial).—Main-rotor diameter, I8ft 5in (14-8 m); overall height, 13ft 4in (4-1 m); maximum weight, 4,938 Ib 2,240 kg); maximum forward speed, 102 to 108-4 m.p.h. (165 to 175 km/hr); i . -inn ^ _ ir/v .. :i /£.An ~— *MC i.__\ 48ft . (2,24 IIIUAIIIIUIII luinuiu afctu, iw. LU iwu~-normal range, 398 to 450 St. miles (640 to 725 km). 1 Nosewheel. 2 Pressure head. 3 Taxying lamp. 4 Clutch lever. 5 Tail-rotor pitch-control pedals. 4 Radio transmitter/receiver. 7 Instrument panel. 8 Cyclic-pitch lever. 9 Collective-pitch lever. 10 Aerial. 11 Central pilot's seat. 12 Bench-type passenger seat. 13 Rotor brake. 14 Oil tank. 15 Collective-pitch linkage. 16 De-icing fluid tank. 17 Control spider. 18 Main gearbox. 19 Oil cooler. 20 De-icing fluid tank. 21 Tail-rotor shaft. 22 Tail-rotor intermediate gearbox. 23 Radio-altimeter aerials. 24 Inverter. 25 Radio-altimeter transmitter/receiver. 26 Fuel tank. 27 Compressed-air bottles . 28 Cooling-air outlet. 29 Compressed-air starter. 30 Battery. 31 Cooling-air intake. ensure excellent visibility for both the pilot and the passengers. The engine (an ASz-21 seven-cylinder, single-row radial speci-ally converted for helicopter use, with fan cooling and developing a maximum of 540 h.p.) is at the back of the cabin and separatedfrom it by a fireproof wall. Cooling air is taken in through an inlet above the passenger cabin. With the horizontal position ofengine the drive to the rotor is taken through an angle gearbox on which a clutch and main-rotor brake are mounted. The out-put shaft connects directly to the main gearbox, which is of the double-pinion type and reduces the speed to some 250 r.p.m. asrequired by the main rotor. From the same gearbox a drive is taken via a transmission shaft to the tail rotor, the shaft beingsupported at three points along the tail boom. Two further reduc- tion gears (intermediate and final) are interposed between themain gearbox and the tail rotor, the housing of the intermediate box being used as a structural element connecting the main tailboom with its upswept rear portion. Three blades, of mixed construction, are used in the main rotor.Articulated blades are connected through hinges and have two degrees of freedom, for movements in axial and horizontal planesrespectively, horizontal oscillations being damped by special fric- tion dampers. Change of incidence angle is affected by the main-rotor spider, its up-and-down movement covering the collective pitch. To prevent the transmission of oscillations from the main-rotor blades to the controls, inertia dampers are included. The three blades of the tail rotor are hinged to the hub, their pitchbeing controlled by toe pedals. A special point worth mentioning in connection with the Mi-1is its suitability for flights in icing conditions. Anti-freezing liquid is then continuously spread over the main and tail rotor bladesand windscreen. Powerful searchlights are fitted for night work. FORTHCOMING EVENTS Apr. 23- May 4. British Industries Fair, Castle Bromwich and Olympia. Apr. 24. R.Ae.S.: Section Lecture: "Development of Helicopter Transport," by R. H. Whitby, B.Sc, A.R.C.S., D.I.C., A.F.R.Ae.S. May 3-4. Canadian Aeronautical Institute: A.G.M., Montreal. May 3-5. Institute of Welding: Spring Meeting. May 9. R.Ae.S.: All Hay Section Lecture on Supersonic Flight. Speakers: A. V. Cleaver, F.R.Ae.S.; P. J. Duncton, B.Sc., D.I.C., A.F.R.Ae.S.; D. J. Farrar, M.A., A.F.R.Ae.S.; H. H. Gardner, B.Sc., F.R.Ae.S. May 11. Helicopter Association: Film Show presented by G/C. R. N. Liptrot, C.B.E., B.A. May 12. Surrey Flying Club: Anniversary Party. May 12-14. Channel Islands Aero Club: International Rally. May 15. R.Ae.S.: Section Lecture: "Medical Aspects of Flight Com- fort and Efficiency," by Dr. A. Buchanan Barbour, O.B.E., M.R.C.S., L.R.C.P., F.R.Ae.S. May 17. R.Ae.S.: The 44th Wilbur Wright Lecture, by Sir William S. Farren, C.B., M.B.E., F.R.S., F.R.Ae.S. May 17-19. F.A.I. Conference, Vienna. Sept. 3-9. S.B.A.C. Display, Farnborough. R.Ae.S. Branch Fixtures (to April 30): Apr. 23, Halton, Film. Apr. 24, Belfast, A.G.M.; Boscombe Down, "Some Developments in Turbine Engines," by Dr. S. G. Hooker. Apr. 26, Bristol, A.G.M. and Film Show. Apr. 30, Halton, Junior member's paper. TURBULENT PROGRAMME AMONG the aerodromes scheduled for visits to date by the* French Druine Turbulent ultra-light F-PHFR, on its demon- stration tour of this country, are Elstree, Stapleford Tawny, Luton, Cambridge, Denham, Fair Oaks, White Waltham and Hatfield. The provisional programme for the remainder of its stay is as follows: — Friday, April 20th, Reading (Woodley); Saturday, April 21st, Ports-mouth, Eastleigh, Bembridge; Sunday, April 22nd, Elstree (participating as defending aircraft in Elstree Flying Club's Tea Patrol and At Home);Friday, April 27th, Cranfield, Coventry (Baginton); Saturday, April 28th, Birmingham (Elmdon), Manchester (Barton); Sunday, April 29th, Derby(Burnaston), Leicester East, Northampton (Sywell), Elstree; Tuesday, May 1st, Bristol (Filton); Friday-Sunday, May 5-7th, Croydon, forreturn flight to Paris. The Popular Flying Association state that the programme of visits to the various clubs and groups, and the departure date, are dependent on weather conditions. Where possible, those wishing to see the Turbulent should confirm its movements either with the local club or at Elstree Aerodrome (Elstree 3070), where the aircraft is based.
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