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Armstrong Siddeley Serval / Double Mongoose


The Serval was a ten-cylinder, double-row, air-cooled radial piston engine. It was developed from the Armstrong Siddeley Mongoose and was, more or less, two Mongooses built around a single crankcase. In fact, it first appeared as the Double Mongoose in May 1928.

Built in several variants, power output was about 340 hp (254 kW).


Serval I initially Double Mongoose
(1931) 340 hp.

Serval III

Serval IIIB
(1932) 310 hp.

Serval IV
310 hp.

Serval V
(1933) 340 hp.


Airco DH.9
Armstrong Whitworth Atalanta
BFW M.36
Canadian Vickers Vancouver
Fairey Fox
ICAR Comercial
Saro Cloud


Serval I
Type: 10-cylinder double-row radial
Bore: 5 in (127 mm)
Stroke: 5.5 in (139.7 mm)
Displacement: 1,080 cu in (17.7 L)
Length: 54.25 in (1,378 mm)
Diameter: 45.6 in (1,158 mm)
Dry weight: 714 lb (324 kg)
Valvetrain: Overhead poppet valves
Fuel type: 77 Octane petrol
Cooling system: Air-cooled
Reduction gear: Direct drive, Left hand tractor
Power output: 340 hp at 2,000 rpm at sea level
Compression ratio: 5:1
Power-to-weight ratio: 0.47 hp/lb



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