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Between 1920 and 1951 the Société des Moteurs Salmson in France developed and built a series of widely used air-cooled aircraft engines.[1]

Salmson 9
Salmson 9Ad
Type	Radial engine
Manufacturer	Société des Moteurs Salmson
First run	1917

Design and development

After their successful water-cooled radial engines, developed from 1908 to 1918, Salmson changed their focus to air-cooling to reduce weight and increase specific power (power per unit weight). The majority of the engines produced by Salmson were of radial type with a few other arrangements such as the Salmson T6.E. In common with other engines produced by this manufacturer, the air-cooled radial engines featured the unorthodox Canton-Unné internal arrangement that dispensed with a master rod in favour of a cage of epicyclic gears driving the crankpin. Production ended in 1951 with the liquidation of the manufacturing company.

British Salmson

The 3,7 and 9 cylinder Salmsons were license-built in Great Britain, during the 1920s and 1930s, by the British Salmson engine company as the British Salmson AD.3, British Salmson AC.7, British Salmson AC.9, and British Salmson AD.9.

Salmson post-WWI engines

In common with several other French aero-engine manufacturers Salmson named their engines with the number of cylinders then a series letter in capitals followed by variant letters in lower-case. Engines not included in the 1932 table which follows are listed here:

Salmson air-cooled engines available in 1932 are listed here[5]

Name	Cylinders	Year	Bore	Stroke	Capacity	Power	Weight
7AC	7-cyl radial		100 mm (3.94 in)	130 mm (5.12 in)	7.150 l (436.3 cu in)	78 kW (105 hp) at 1,800 rpm	130 kg (287 lb)
9AB	9-cyl radial		125 mm (4.92 in)	170 mm (6.69 in)	18.765 l (1,145.1 cu in)	186 kW (250 hp) at 1,700 rpm	265 kg (584 lb)
9AC	9-cyl radial		100 mm (3.94 in)	130 mm (5.12 in)	9.189 l (560.7 cu in)	97 kW (130 hp) at 1,800 rpm	170 kg (375 lb)
9AD	9-cyl radial		70 mm (2.76 in)	86 mm (3.39 in)	2.979 l (181.8 cu in)	34 kW (45 hp) at 2,000 rpm	68 kg (150 lb)
9ADb	9-cyl radial		70 mm (2.76 in)	86 mm (3.39 in)	2.979 l (181.8 cu in)	41 kW (55 hp) at 2,200 rpm	74 kg (163 lb)
9ADr	9-cyl radial		70 mm (2.76 in)	86 mm (3.39 in)	2.979 l (181.8 cu in)	48 kW (65 hp) at 2,700 rpm	79 kg (174 lb)
9NA	9-cyl radial		140 mm (5.51 in)	160 mm (6.30 in)	22.140 l (1,351.1 cu in)	246 kW (330 hp) at 1,800 rpm	292 kg (644 lb)
9NAs	9-cyl radial		140 mm (5.51 in)	160 mm (6.30 in)	22.140 l (1,351.1 cu in)	336 kW (450 hp) at 1,800rpm	315 kg (694 lb)
9NC	9-cyl radial		100 mm (3.94 in)	140 mm (5.51 in)	9.900 l (604.1 cu in)	112 kW (150 hp) at 1,800 rpm	155 kg (342 lb)
9NCt	9-cyl radial		100 mm (3.94 in)	140 mm (5.51 in)	9.900 l (604.1 cu in)	127 kW (170 hp) at 1,800 rpm	165 kg (364 lb)
18AB	18-cyl air-cooled two-row radial		125 mm (4.92 in)	180 mm (7.09 in)	39.761 l (2,426.4 cu in)	410 kW (550 hp) at 1,700 rpm	450 kg (992 lb)
18ABs	18-cyl air-cooled two-row radial		125 mm (4.92 in)	180 mm (7.09 in)	39.761 l (2,426.4 cu in)	485 kW (650 hp) at 1,700 rpm	465 kg (1,025 lb)

Applications

Nine cylinder engines

Seven cylinder engines

7AC

• Albert A-61
• Caudron C.191&2
• Caudron C.220
• Caudron C.270
• Dewoitine D.480
• Farman F.234
• Farman F.280
• Farman F.352
• Hanriot H.411
• Kellner-Béchereau 23
• Morane-Saulnier MS.132
• Morane-Saulnier MS.148
• Potez 36/5

Five cylinder engines

5Ap

• Jodel D.123

5Aq

• Caudron C.109.2
• CFA D.7 Cricri Major

5AC

• Caudron C.110
• Caudron C.161
• Jodel D.124
• Potez 36/3

Specifications (9 Ab)

Data from Tsygulev[6]

General characteristics

• Type: Nine-cylinder single-row supercharged air-cooled radial engine
• Bore: 125 mm (4.92 in)
• Stroke: 170 mm (6.69 in)
• Displacement: 18.765 L (1,145 in³)
• Length: 1,000 mm (39.37 in)
• Diameter: 1,180 mm (46.46 in)
• Dry weight: 265 kg (584 lb)

Components

• Valvetrain: Two overhead valves per cylinder
• Supercharger: Single-speed centrifugal type supercharger
• Fuel system: Zenith 42D carburetor
• Cooling system: Air-cooled

Performance

• Power output: 191 kW (256 hp) at 1,780 rpm for takeoff
• Specific power: 10.18 kW/L (0.22 hp/in³)
• Compression ratio: 5:1
• Specific fuel consumption: 328 g/(kW•h) (0.54 lb/(hp•h))
• Oil consumption: 19 g/(kW•h) (0.49 oz/(hp•h))
• Power-to-weight ratio: 0.72 kW/kg (0.44 hp/lb)

See also

• Salmson water-cooled aero-engines
• List of aircraft engines

Notes

References

• Gunston, Bill (1986). World Encyclopaedia of Aero Engines. Wellingborough: Patrick Stephens. p. 152.
• Lumsden, Alec. British Piston Engines and their Aircraft. Marlborough, Wiltshire: Airlife Publishing, 2003. ISBN 1-85310-294-6.
• Cuny, Jean. "Latécoère - Les Avions et Hydravions".Paris. Docavia/Editions Lariviere. 1992. ISBN 2-907051-01-6

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