The Armstrong-Siddeley Double-Mamba turboprop featured two independent power sections powering two seperate counter-rotating propellers. One section could be shut down to increase efficiency and extend range during patrol. The turboprop could run off of the fuel from the aircraft carrier's diesel fuel bunker, decreasing the amount of aviation gas and aviation gas tanks needed.
After the Royal Navy's large aircraft carriers were retired, the Gannet was replaced by the Westland Wessex helicopter. Eventually all the export countries, such as the Netherlands and Australia, also replaced their Gannets.
|AS Mk I||AS Mk 4|
|Powerplant||One 2230 kW (2950 shp) Armstrong Siddeley Double-Mamba 100 turboprop||One 2280 kW (3015 shp) Armstrong Siddeley Double-Mamba Mark 101 turboprop|
|Armament||1300 kg (2900 pounds) of torpedoes, depth charges and sonobuoys in a bomb bay plus rockets on underwing hardpoints|
|Ceiling||7600 m (25,000 ft)|
|Max Speed||500 kph (269 kts/310 mph)||485 kph (261 kts/301 mph)|
|Range||1518 km (819 nm/943 miles)|
|Range with full armament||1227 km (662 nm/762 miles)|
|Empty||6841 kg (15,069 lb)||6900 kg (15,200 lb)|
|MTOW||9806 kg (21,600 lb)||10,200 kg (22,500 lb)|
|Wingspan||16.6 m (54 ft 4 in)|
|Length||13.1 m (43 ft)|
|Height||4.2 m (13 ft 8.5 in)|
|Wing area||45.5 m² (489.7 sq ft)|