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Armstrong Whitworth AW.681

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The Armstrong Whitworth AW.681, also known as the Whitworth Gloster 681 or Hawker Siddeley HS.681, was a projected British long-range STOL military transport aircraft design by Armstrong Whitworth Aircraft and was to be capable of development to VTOL performance. The AW.681 was designed to meet the NATO specification BMR-4.

Design and development

To meet Royal Air Force Operation Requirement 351 to specification C.241, Armstrong Whitworth's 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 6,000 lbf (26.7 kN) RB.162-64 lift engines or replacement of the Medways with four Bristol Siddeley Pegasus ducted flow turbofans was proposed to obtain VTOL capability. The Pegasus 5-6 would have been rated at around 18,000 lbf (80 kN).[2]

The project was under development for the Royal Air Force when it was cancelled in January 1965.[3]

Specifications (proposed STOL)

Data from Armstrong Whitworth Aircraft since 1913 [4]

General characteristics

  • Payload: 35,000 lb (15,900 kg)
  • Length: 104 ft 2 in (31.75)
  • Wingspan: 134 ft (40.84)
  • Height: 37 ft 10 in (11.53 m)
  • Wing area: 2,250 sq ft (209 m²)
  • Max takeoff weight: 181,200 lb (82,360 kg)
  • Powerplant:Rolls-Royce Medway turbofan with thrust deflection, 13,790 lb (61.3 kN) each


See also

Comparable aircraft



  1. (1963-03-14) "Whitworth Gloster 681". Flight International: 361. Retrieved on 2008-10-08. 
  2. Pegasus engine variants
  3. Taylor, John W.R. (1990). The Lore of Flight. London: Universal Books, 348. ISBN 0-9509620-15. 
  4. Tapper 1988, p.344.


  • Tapper, Oliver (1988). Armstrong Whitworth Aircraft since 1913. London: Putnam. ISBN 0 85177 826 7. 

External links

Template:Commons category

Template:Armstrong Whitworth aircraft Template:Hawker Aircraft aircraft

ja:アームストロング・ホイットワース AW.681

This article is licensed under the GNU Free Documentation License.
It uses material from the Wikipedia article "Armstrong Whitworth AW.681".