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Aviation History
1955
1955 - 1274.PDF
388 Alyle Leonid** Major UM t-2 heli- copter anginc. Fourteen-cylinder, air- cooled, poppet-valve radial, with vertical crank-shaft, fan cooling and remote reduction gearbox. Bore, 4.8in; stroke, 4.41in; swept volume, 1,117 cu in (18.28 litres); overall diameter, 38.925in; total height, S4.8S8in; dry weight, 1,000 Ib; maximum power, 870 b.h.p. at 3,000 r.p.m. at 8 Ib boon at sea level. AM* Leonides 583/8 (fixed-wing). Nine- cylinder, air-cooled, poppet-valve radial, with single-speed, single-stage super- charger, injection carburettor and geared drive. Bore, 4.8in; stroke, 4.41 in: swept volume, 718.4 cu in (11.78 litres); overall diameter, 41 .Sin; length. S4.4in; dry weight, 798 Ib; maximum power, 570 b.h.p. at 3,000 r.p.m. at 8 Ib boost. Armstrong Siddeley Double Mamba ASMD.3. Power sections similar to ASM.5 Mamba. Overall width, 52.8in; height, 44.25in; length, 98.7in; dry weight, 2,200 Ib; maximum power, 2,740 s.h.p. plus 770 Ib thruM (3,035 e.h.p.) at 15,000 r.p.m. with s.f.c. of 0.71 Ib/hr/e.h.p. ALVIS LTD. FLIGHT Coventry. Tel. Coventry 5501 Leonides and Leonides Major. Provosts ofFlying Training Command logged an impressive number of hours during the past 12 months, asdid the many other fixed-wing aircraft and heli- copters powered by the nine-cylinder Leonides.This compact air-cooled radial is provided with single-lever control acting upon an automaticHobson fuel-injection carburettor. In helicopters, the engine can be mounted vertically, and thereduction gear is removed to a position immedi- ately beneath the hub of the rotor. Integral withthe engine are a clutch and cooling fan. The cylinder assembly poses a lengthy develop-ment problem in a new piston engine and it augers well for the Leonides Major that it hasa virtually identical cylinder; 14 are employed in two rows. Reducing the number of "pots" perrow has made possible a reduction in crankcase diameter, and the Major has the remarkably smalloverall diameter of 38.9in. A very efficient cowl- ing has been evolved for fixed-wing installations,with four petal-type panels. This complete instal- lation has been extensively test-flown in theHandley Page H.P.R.S, and is now used in die production Herald transport.A special version of the Major, illustrated, has been evolved for helicopter propulsion. One ofdie most important applications of this engine is the powering of one version of the Bristol 191anti-submarine helicopter. ARMSTRONG SIDDELEYMOTORS LTD. Parkside, Coventry. Tel. Coventry 62666 Doable Mamba. This unusual engine consistsof a pair of Mamba power sections attached to a common reduction gearbox. Left- and right-handcomponents have individual fuel, lubrication and control systems and each drives through its owngear train to a four-blade Rotol 1 lft airscrew, the two airscrews being fitted in tandem. Each sec-tion has a Rotax twin-cartridge starter, although either half can be windmill-started from theslipstream from the airscrew of the other. The first production rating was ASMD.l at2,850 e.h.p. For the Gannet, such engines have been delivered in quantity during the year fromthe company's Ansty factory, and these are now fully established in carrier service. Both powersections are normally employed for take-off, although, for ferrying purposes, the Gannet cantake off on one power section. In cruising flight one side of the engine is completely shut downand die remainder is operated at a high cruising power corresponding to the bottom of the s.f.c.loop. When necessary, full power from both halves can be achieved within a very few seconds. A type-test at 3,035 ch.p. has now been com-pleted by die ASMD.3 and a new range of annular-chamber engines has been started withthe ASMD.4, the latter being considerably more powerful than its predecessors. Like the Mamba,the Double Mamba can be run on any standard turbine fuel, including ship's fuel oil, withoutadjustment.
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