The Wolseley Aries III or A.R.9 was a British nine-cylinder, 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 An aircraft engine, often referred to as an aero engine, is the power component of an aircraft propulsion system. Most aircraft engines are either piston engines or gas turbines, although a few have been rocket powered and in recent years many ...

that first ran in 1933, it was designed and built by

Wolseley Motors Wolseley Motors Limited was a British motor vehicle manufacturer founded in early 1901 by the Vickers Armaments in conjunction with Herbert Austin. It initially made a full range, topped by large luxury cars, and dominated the market in the E ...

. Intended for the military

trainer aircraft A trainer is a class of aircraft designed specifically to facilitate flight training of pilots and aircrews. The use of a dedicated trainer aircraft with additional safety features—such as tandem flight controls, forgiving flight characteristi ...

market few were produced as Wolseley withdrew from the aero engine market in 1936. A larger capacity version was known as the Wolseley Scorpio. Further-enlarged versions, the Leo and Libra, were test run but did not fly.

Variants

;A.R.9 Mk I :203 horsepower (151 kW). ;A.R.9 Mk II :205 horsepower (153 kW). Higher permissible rpm version of Mk I. ;A.R.9 Aries Mk III :225 horsepower (168 kW), low boost

supercharger In an internal combustion engine, a supercharger compresses the intake gas, forcing more air into the engine in order to produce more power for a given displacement. The current categorisation is that a supercharger is a form of forced indu ...

fitted. ;Scorpio I :250 horsepower (186 kW), (230 bhp at 2,250 rpm), increased bore (111mm x 120 mm) to give a displacement of 9,477 cc, increased

compression ratio The compression ratio is the ratio between the volume of the cylinder and combustion chamber in an internal combustion engine at their maximum and minimum values. A fundamental specification for such engines, it is measured two ways: the stati ...

. Reduction gearing. ;Scorpio II and III :250 horsepower (186 kW), designed to run on 87

octane Octane is a hydrocarbon and an alkane with the chemical formula , and the condensed structural formula . Octane has many structural isomers that differ by the amount and location of branching in the carbon chain. One of these isomers, 2,2,4-t ...

fuel with 6.5:1 ratio. ;Leo :280 horsepower (209 kW), few details, not flown or produced. ;Libra :390 hp at 6,000 ft.''Flight'' 23 April 1936. p441 725 lbs (329 kg). Tested but not flown or produced.

Applications

Airspeed Envoy The Airspeed AS.6 Envoy was a twin-engined light transport aircraft designed and produced by the British aircraft manufacturer Airspeed Ltd. The Envoy originated as a heavier twin-engine derivative of Airspeed's Courier light transport aircraf ...

* Hawker Tomtit

Specifications (A.R.9 Aries Mk III)

References

Notes

Bibliography

* Lumsden, Alec. ''British Piston Engines and their Aircraft''. Marlborough, Wiltshire: Airlife Publishing, 2003. .

External links

''Flight'', June 1936 - Wolseley Aries sectioned image
{{Wolseley aeroengines 1930s aircraft piston engines Aircraft air-cooled radial piston engines Aries