Aircraft Data Sheet: Westland (Agusta-Bell) Sioux AH MK 1, HT MK 2 & HT Mk 3
| First flight: | 9th March 1965. (Westland built) |
| Rotor diameter: | 11.32m/37ft 1ins |
| Length: | 13.17m/43ft 2ins |
| Max weight: | 1,338kg/2,950lb |
| Max speed: | 169kph/73knots |
| Power: | One 260shp/194kW Avco Lycoming TVO-435-A1A turbo-charged piston engine. |
| Accommodation: | Pilot plus two |
| No Built: | 253 |
A three seat general-purpose helicopter and trainer, basically the Bell 47G-4 built under licence from Agusta and Bell, ordered for all three UK services. A number of the 47G-4 variant were built for Bristol Helicopters.The licence agreement for the Sioux was the first occasion where Westland worked with Agusta.