In 1951 Alvis started development of a 14-cylinder, two row radial of 1,118 cu in (18.3 L) displacement, based on the Leonides. Certification covered the Mk. 702/1 for aeroplanes at 875 hp (652 kW) and the 751/1 for helicopters at 850 hp (630 kW). The only numerous model of the Major was the Mk. 755/1, a medium supercharged, de-rated, obliquely mounted direct-drive and fan cooled engine fitted to the Westland Whirlwind Mks. 5, 6, 7 and 8.[2]
Variantsedit
Data from:British Piston Engines and their Aircraft.[3]
Leonides Major 702/1
850–875 hp (634–652 kW) for aeroplanes, also known as A.LE.M.1-1 in Air Ministry
Leonides Major 751/1
850 hp (630 kW) for helicopters, also known as A.LE.M.1-2
Leonides Major 755/1
780 hp (580 kW) for helicopters in a 35° canted mounting, also known as A.LE.M.1-6 and as Mk.155 in civil aircraft
Leonides Major 755/2
780 hp (580 kW) for helicopters in a vertical mounting, also known as A.LE.M.1-6 and as Mk.160 in civil aircraft
Applicationsedit
Bristol Type 173 Mk3 – 2x 755/1 (Mk.155) 780 hp (580 kW); 2x 755/2 (Mk.160) 780 hp (580 kW)
^Lumsden, Alec (2003). British Piston Engines and their Aircraft. Marlborough, Wiltshire: Airlife Publishing. pp. 60–61. ISBN978-1-85310-294-3.
^Bridgman, Leonard, ed. (1956). Jane's all the World's Aircraft 1956–57. London: Jane's all the World's Aircraft Publishing Co. Ltd. pp. 417–419.
April 10, 2024
alvis, leonides, major, british, cooled, cylinder, radial, aero, engine, developed, alvis, from, earlier, nine, cylinder, leonides, leonides, majortype, radial, enginenational, origin, united, kingdommanufacturer, alvismajor, applications, westland, whirlwindd. The Alvis Leonides Major is a British air cooled 14 cylinder radial aero engine developed by Alvis from the earlier nine cylinder Leonides 1 Leonides MajorType Radial engineNational origin United KingdomManufacturer AlvisMajor applications Westland WhirlwindDeveloped from Alvis Leonides Contents 1 Design and development 2 Variants 3 Applications 4 Specifications Leonides Major 702 1 4 1 General characteristics 4 2 Components 4 3 Performance 5 See also 6 ReferencesDesign and development editIn 1951 Alvis started development of a 14 cylinder two row radial of 1 118 cu in 18 3 L displacement based on the Leonides Certification covered the Mk 702 1 for aeroplanes at 875 hp 652 kW and the 751 1 for helicopters at 850 hp 630 kW The only numerous model of the Major was the Mk 755 1 a medium supercharged de rated obliquely mounted direct drive and fan cooled engine fitted to the Westland Whirlwind Mks 5 6 7 and 8 2 Variants editData from British Piston Engines and their Aircraft 3 Leonides Major 702 1 850 875 hp 634 652 kW for aeroplanes also known as A LE M 1 1 in Air Ministry Leonides Major 751 1 850 hp 630 kW for helicopters also known as A LE M 1 2 Leonides Major 755 1 780 hp 580 kW for helicopters in a 35 canted mounting also known as A LE M 1 6 and as Mk 155 in civil aircraft Leonides Major 755 2 780 hp 580 kW for helicopters in a vertical mounting also known as A LE M 1 6 and as Mk 160 in civil aircraftApplications editBristol Type 173 Mk3 2x 755 1 Mk 155 780 hp 580 kW 2x 755 2 Mk 160 780 hp 580 kW Handley Page HPR 5 Herald four 850 hp 630 kW 702 1 Westland Whirlwind 1x 755 1 Mk 155 or 1x 755 2 Mk 160 780 hp 580 kW Specifications Leonides Major 702 1 editData from Jane s All the World s Aircraft 1956 57 4 General characteristics Type 14 cylinder twin row air cooled radial piston engine geared down and supercharged Bore 4 80 in 122 mm Stroke 4 41 in 112 mm Displacement 1 118 cu in 18 32 L Length 70 9 in 180 cm Diameter 38 9 in 99 cm Dry weight 1 200 lb 540 kg dry Components Valvetrain 2 sodium cooled valves per cylinder driven by 2 cam discs Supercharger Single speed single stage driven at 6 5 1 Fuel system Fuel injection low pressure via Hobson or SU pump Fuel type 100 130 octane Oil system Dry sump pressure and scavenge pumps Cooling system Air cooled Reduction gear Farman type epicyclic ratio 0 533 1 2 spark plugs per cylinder twin BTH C 14 C 1 magnetosPerformance Power output international rating 860 hp 642 kW at 1 500 ft 457 m Compression ratio 6 8 1 Fuel consumption 60 imp gal 72 US gal 270 L per hour at maximum continuous power Oil consumption 6 12 pint h 3 4 6 8 L h See also editRelated development Alvis LeonidesComparable engines Pratt amp Whitney R 1535Related lists List of aircraft enginesReferences edit nbsp Wikimedia Commons has media related to Alvis Leonides Major Gunston Bill 1989 World encyclopaedia of aero engines Fully rev 2nd ed Wellingborough P Stephens p 13 ISBN 1 85260 163 9 Lumsden 2003 pp 60 61 Lumsden Alec 2003 British Piston Engines and their Aircraft Marlborough Wiltshire Airlife Publishing pp 60 61 ISBN 978 1 85310 294 3 Bridgman Leonard ed 1956 Jane s all the World s Aircraft 1956 57 London Jane s all the World s Aircraft Publishing Co Ltd pp 417 419 Retrieved from https en wikipedia org w index php title Alvis Leonides Major amp oldid 1178744252, wikipedia, wiki, book, books, library,
