Alvis Leonides Major

Leonides Major;
	; ;
Type;	; Radial engine;
; National origin;	; United Kingdom;
Manufacturer;	; Alvis;
; Major applications;	; Westland Whirlwind;
; Developed from;	; Alvis Leonides;

The Alvis Leonides Major was a British air-cooled 14-cylinder radial aero engine developed by Alvis from the earlier nine-cylinder Leonides.^[1]

Design and development

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]

Variants

Data from:British Piston Engines and their Aircraft^[3]Notes: A.LE designations from Air Ministry system (where known); 700 series designations from Alvis company designation system; Mark numbers for civil variants.

A.LE.M.1-1: (702/1) 850 hp (630 kW) for aeroplanes
A.LE.M.1-6: (755/1 & /2) 780 hp (580 kW) for helicopters in a 35° canted mounting (755/1) or vertical mounting (755/2).
Leonides Major 702/1: 850–875 hp (634–652 kW) for aeroplanes
Leonides Major 751/1: 850 hp (630 kW) for helicopters
Leonides Major 755/1: 780 hp (580 kW) for helicopters in a 35° canted mounting
Leonides Major 755/2: 780 hp (580 kW) for helicopters in a vertical mounting
Leonides Major Mk.155: (755/1) 780 hp (580 kW) for helicopters in a 35° canted mounting
Leonides Major Mk.160: (755/2) 780 hp (580 kW) for helicopters in a vertical mounting

Applications

Bristol 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)

Data 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 disks

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 magnetos

Performance

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)

References

^ Gunston, Bill (1989). World encyclopaedia of aero engines (Fully rev. 2nd ed.). Wellingborough: P. Stephens. p. 13. ISBN 1-85260-163-9..mw-parser-output cite.citation{font-style:inherit}.mw-parser-output q{quotes:"""""""'""'"}.mw-parser-output code.cs1-code{color:inherit;background:inherit;border:inherit;padding:inherit}.mw-parser-output .cs1-lock-free a{background:url("//upload.wikimedia.org/wikipedia/commons/thumb/6/65/Lock-green.svg/9px-Lock-green.svg.png")no-repeat;background-position:right .1em center}.mw-parser-output .cs1-lock-limited a,.mw-parser-output .cs1-lock-registration a{background:url("//upload.wikimedia.org/wikipedia/commons/thumb/d/d6/Lock-gray-alt-2.svg/9px-Lock-gray-alt-2.svg.png")no-repeat;background-position:right .1em center}.mw-parser-output .cs1-lock-subscription a{background:url("//upload.wikimedia.org/wikipedia/commons/thumb/a/aa/Lock-red-alt-2.svg/9px-Lock-red-alt-2.svg.png")no-repeat;background-position:right .1em center}.mw-parser-output .cs1-subscription,.mw-parser-output .cs1-registration{color:#555}.mw-parser-output .cs1-subscription span,.mw-parser-output .cs1-registration span{border-bottom:1px dotted;cursor:help}.mw-parser-output .cs1-hidden-error{display:none;font-size:100%}.mw-parser-output .cs1-visible-error{font-size:100%}.mw-parser-output .cs1-subscription,.mw-parser-output .cs1-registration,.mw-parser-output .cs1-format{font-size:95%}.mw-parser-output .cs1-kern-left,.mw-parser-output .cs1-kern-wl-left{padding-left:0.2em}.mw-parser-output .cs1-kern-right,.mw-parser-output .cs1-kern-wl-right{padding-right:0.2em}

^ 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.

[Gunston-1] Gunston, Bill (1989). World encyclopaedia of aero engines (Fully rev. 2nd ed.). Wellingborough: P. Stephens. p. 13. ISBN 1-85260-163-9..mw-parser-output cite.citation{font-style:inherit}.mw-parser-output q{quotes:"""""""'""'"}.mw-parser-output code.cs1-code{color:inherit;background:inherit;border:inherit;padding:inherit}.mw-parser-output .cs1-lock-free a{background:url("//upload.wikimedia.org/wikipedia/commons/thumb/6/65/Lock-green.svg/9px-Lock-green.svg.png")no-repeat;background-position:right .1em center}.mw-parser-output .cs1-lock-limited a,.mw-parser-output .cs1-lock-registration a{background:url("//upload.wikimedia.org/wikipedia/commons/thumb/d/d6/Lock-gray-alt-2.svg/9px-Lock-gray-alt-2.svg.png")no-repeat;background-position:right .1em center}.mw-parser-output .cs1-lock-subscription a{background:url("//upload.wikimedia.org/wikipedia/commons/thumb/a/aa/Lock-red-alt-2.svg/9px-Lock-red-alt-2.svg.png")no-repeat;background-position:right .1em center}.mw-parser-output .cs1-subscription,.mw-parser-output .cs1-registration{color:#555}.mw-parser-output .cs1-subscription span,.mw-parser-output .cs1-registration span{border-bottom:1px dotted;cursor:help}.mw-parser-output .cs1-hidden-error{display:none;font-size:100%}.mw-parser-output .cs1-visible-error{font-size:100%}.mw-parser-output .cs1-subscription,.mw-parser-output .cs1-registration,.mw-parser-output .cs1-format{font-size:95%}.mw-parser-output .cs1-kern-left,.mw-parser-output .cs1-kern-wl-left{padding-left:0.2em}.mw-parser-output .cs1-kern-right,.mw-parser-output .cs1-kern-wl-right{padding-right:0.2em}

[2] Lumsden 2003, pp.60-61.

[Lumsden-3] Lumsden, Alec (2003). British Piston Engines and their Aircraft. Marlborough, Wiltshire: Airlife Publishing. pp. 60–61. ISBN 978-1-85310-294-3.

[JAWA56-57-4] 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.

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