British Salmson aero-engines refers to a series of small French designed, air-cooled radial aero engine that were produced by British Salmson, under license from Société des Moteurs Salmson, in Great Britain during the late 1920s and 1930s.
Because the relatively low power was divided among several cylinders, the running of the engines was particularly smooth, and the torque was very even. Adding to the smooth running of these engines was the use of the Canton-Unne system of planetary gears in a cage connecting pistons to crank-pin.
AD.3
Three cylinder license production of the Salmson 3 Ad
AC.7
105 horsepower (78 kW) seven cylinder radial, capacity 7.15 litres (436 cu in)
AC.9
135 horsepower (101 kW) nine cylinder radial, capacity 9.2 litres (560 cu in)
AD.9
50 horsepower (37 kW) at 2000 rpm (normal power) or 55 horsepower (41 kW) at 2200 rpm (maximum power). Bore of 70 mm.
AD.9R
70 horsepower (52 kW), geared version of AD.9 with increased bore of 73 mm and increased compression ratio (6:1) (3239cc / 197.7cuin).
AD.9NG
203 horsepower (151 kW), increased bore and stroke. (100 x 140 mm, 9896cc (603.9cuin) capacity).
AD.9
Angus Aquila
BA Swallow
Comper Swift
Boulton Paul P.41 Phoenix
General Aircraft Monospar
Hafner Revoplane
Hinkler Ibis
Parmentier Wee Mite
AD.9R
Arpin A-1
AD.9NG
Cierva C.40
Data from Salmson in Flight magazine, April 4, 1930]
Type: Nine-cylinder, single-row, air-cooled radial engine
Bore: 70 mm (2.76 in)
Stroke: 86 mm (3.39 in)
Displacement: 2,979 cm3 (181.8 cu in)
Diameter: 686 mm (27.0 in)
Dry weight: 70 kg (154 lb)
Valvetrain: Two overhead valves per cylinder, pushrod operated
Fuel system: Claudel carburettor
Oil system: Pressure lubrication
Cooling system: Air-cooled
Reduction gear: Direct drive
Power output: 37 kW (50 hp) at 2,000 rpm
Compression ratio: 5.6:1
Power-to-weight ratio: 0.42 kW/kg (0.26 hp/lb)
