Armstrong Whitworth AW.681
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| AW.681 / HS.681 | |
|---|---|
 Manufacturer's model of the AW.681 |
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| Type | Projected VTOL Military transport |
| Manufacturer | Hawker Siddeley |
| Status | Project cancelled January 1965 |
The Armstrong Whitworth AW.681 also known as the Hawker Siddeley HS.681 was a projected British long-range STOL military transport aircraft design by Hawker Siddeley Aviation and was to be capable of development to VTOL performance. The AW.681 was designed to meet the NATO specification of BMR-4.
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[edit] Design and development
To meet Operation Requirement 351 to specification C.241, Armstrong Whitworths design was selected.[1]
The aircraft featured a swept shoulder mounted wing and a high T-tail. The rear fuselage was upswept with loading doors and a ramp. Four Rolls-Royce RB.142 Medway engines with vectored thrust nozzles were to be mounted on pylons under the wings which were to feature boundary layer control with blown flaps, leading edges, and ailerons. The Medway engines would have given STOL performance only. The use of an additional 18 RB.162-64 lift engines (6,000 lb, 26.7 kN each) or replacement of the Medways with four Bristol Siddeley 5-6 ducted flow turbofans was proposed to obtain VTOL capability. The Pegasus 5-6 would have been rated at around 18,000 lb.[2]
The project was under development for the Royal Air Force when it was cancelled in January 1965.[3]
[edit] Specifications (proposed STOL)
This aircraft article is missing some (or all) of its specifications. If you have a source, you can help Wikipedia by adding them.Data from[citation needed]
General characteristics
- Length: 31.75 (102 ft 2 in)
- Wingspan: 40.84 (134 ft)
- Height: 11.53 m (37 ft 10 in)
- Powerplant: 4× Rolls-Royce Medway turbofan with thrust deflection, 61.3 kN[4] (13,790 lb) each
Performance
- Maximum speed: Mach 0.71
- Range: 7,725 km ()
- Service ceiling 7,620 m ()
[edit] See also
Comparable aircraft
[edit] References
- ^ Name
- ^ Pegasus engine variants
- ^ Taylor, John W.R. (1990). The Lore of Flight. London: Universal Books, p.348. ISBN 0-9509620-15.
- ^ Name
[edit] External links
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