British Salmson aero-engines refers to a series of small French designed, air-cooled

radial Radial is a geometric term of location which may refer to: Mathematics and Direction * Vector (geometric), a line * Radius, adjective form of * Radial distance, a directional coordinate in a polar coordinate system * Radial set * A bearing f ...

aero engine that were produced by British Salmson Aero Engines Ltd, under license from

Société des Moteurs Salmson Salmson is a French engineering company. Initially a pump manufacturer, it turned to automobile and aeroplane manufacturing in the 20th century, returning to pump manufacturing in the 1960s, and re-expanded to a number of products and services ...

, in

Great Britain Great Britain is an island in the North Atlantic Ocean off the northwest coast of continental Europe. With an area of , it is the largest of the British Isles, the largest European island and the ninth-largest island in the world. It i ...

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 In physics and mechanics, torque is the rotational equivalent of linear force. It is also referred to as the moment of force (also abbreviated to moment). It represents the capability of a force to produce change in the rotational motion of th ...

was very even.Salmson
in ''Flight'' magazine, April 4, 1930. 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.

Variants

;AD.3:Three cylinder license production of the Salmson 3 Ad ;AC.7: seven cylinder radial, capacity ;AC.9: nine cylinder radial, capacity ;AD.9: at 2000 rpm (normal power) or at 2200 rpm (maximum power). Bore of 70 mm. ;AD.9R:, geared version of AD.9 with increased bore of 73 mm and increased compression ratio (6:1) (3239cc / 197.7cuin). ;AD.9NG:, increased bore and stroke. (100 x 140 mm, 9896cc (603.9cuin) capacity).

Applications

;AD.9 * Angus Aquila *

BA Swallow The B.A Swallow was a British light aircraft of the 1930s. It was a license-built version by the British Klemm Aeroplane Company (which later became known as the British Aircraft Manufacturing Co.) of the German Klemm L.25. A total of 135 were ...

Comper Swift The Comper C.L.A.7 Swift is a British 1930s single-seat sporting aircraft produced by Comper Aircraft Company Ltd of Hooton Park, Cheshire. Design and development In March 1929 Flight Lieutenant Nicholas Comper left the Royal Air Force and form ...

* Boulton Paul P.41 Phoenix *

General Aircraft Monospar The General Aircraft Monospar was a 1930s British family of touring and utility aircraft built by General Aircraft Ltd (GAL). Design and development In 1929, the Monospar Company Ltd was formed to pursue new techniques of designing cantileve ...

* Hafner Revoplane * Hinkler Ibis * Parmentier Wee Mite ;AD.9R * Arpin A-1 ;AD.9NG * Cierva C.40

Specifications (AD.9)

References

Notes

Bibliography