The Whirlwind is a liquid cooled 4-stroke rotary engine working on the epitrochoidal rotary Wankel principle.
Designed as a compact, self contained unit, the Whirlwind engine package includes integral radiators and a built-in water pump to simplify installation.
Liquid-cooled, single rotor Wankel engine c/w integral radiators and water pump. Chamber volume 294cc Dry weight13.5kg (29lb 12oz) (complete with radiators, water pump carburettor and ignition system but less exhaust)
Rotation counter-clockwise when viewed from power take-off end
Power 31kW (41.5 bhp) @ 7,800 rpm, Torque 47 Nm @ 4,500 rpm
Type used in the Banshee UAV flown from Aberporth, this engine from Outer Hebrides (South Uist)