Salmson air-cooled aero-engines

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

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

Maryse Hilsz holding the propeller of her Mauboussin M.122 with Salmson 9 Aé.RS,[2] 1935

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 . In common with other engines produced by this manufacturer, the air-cooled radial engines featured the unorthodox internal arrangement that dispensed with a 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 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:

3AD
8.9 kW (12 hp) at 1800 rpm rated[3]
5Ac
89 kW (120 hp)[4]
5Ap-01
5Aq-01
6Ad
6TE
6TE.S
7Ac
7Aq
7M
7Om
8As
9Ac
30 kW (40 hp)
9AB
150 kW (200 hp) at 1500 rpm rated[3]
9ABa
9ABc
172 kW (230 hp)
9Az
220 kW (300 hp) at 1500 rpm rated[3]
9A2c
9M
 
9Nd
130 kW (175 hp)
9Ne
9Ng
9Nh
9P
9Y
11B
12C
W-12
18Z
Salmson-Szydlowski SH18
18 cylinder air-cooled 2-stroke radial

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[]

9AB
9AC
9AD
9AG
  • Morane-Saulnier MS.406
9AZ
9NC
9ND
9NE
9NH
9NM

Seven cylinder engines[]

7AC[]

Five cylinder engines[]

5Ap[]

5Aq[]

5AC[]

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[]

Notes[]

  1. ^ Gunston 1986, p. 158.
  2. ^ "Archived copy". Archived from the original on 2014-04-13. Retrieved 2014-04-12.CS1 maint: archived copy as title (link)
  3. ^ Jump up to: a b c Salmson 1927 advert
  4. ^ "Les Moteurs d'aviation Salmson". L'Aérophile: 33–34. 1–15 January 1924.
  5. ^ Hartmann, Gerard. "LA SOCIETE DES MOTEURS SALMSON" (PDF). hydroretro.net (in French). p. 13. Retrieved 11 April 2015.
  6. ^ Tsygulev (1939). Aviacionnye motory voennykh vozdushnykh sil inostrannykh gosudarstv (Авиационные моторы военных воздушных сил иностранных государств) (in Russian). Moscow: Gosudarstvennoe voennoe izdatelstvo Narkomata Oborony Soyuza SSR. Archived from the original on 2009-03-24.

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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