AW.681 / HS.681
Manufacturer's model of the AW.681
Role	Projected VTOL Military transport
Manufacturer	Hawker Siddeley
Status	Project cancelled January 1965

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.

Contents 1 Design and development 2 Specifications (proposed STOL) 3 See also 4 References 4.1 Notes 4.2 Bibliography 5 External links

[edit] 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]

[edit] 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: 4× Rolls-Royce Medway turbofan with thrust deflection, 13,790 lb (61.3 kN) each

Performance

• Maximum speed: Mach 0.71
• Range: 4,801 mi (7,725 km)
• Service ceiling: 25,000 ft (7,620 m)

[edit] See also

Comparable aircraft

• Boeing YC-14
• Dornier Do 31
• McDonnell Douglas YC-15
  

[edit] References

[edit] Notes

[edit] Bibliography

[edit] External links

• Flight magazine, 1964 - HS.681

Wikimedia Commons has media related to: Armstrong Whitworth AW.681

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v • d • e Hawker and Hawker Siddeley aircraft Project numbers P.1000 • P.1001 • P.1002 • P.1003 • P.1004 • P.1005 • P.1006 • P.1007 • P.1008 • P.1009 • P.1010 • P.1011 • P.1012 • P.1013 • P.1014 • P.1015 • P.1016 • P.1017 • P.1018 • P.1019 • P.1020 • P.1021 • P.1022 • P.1023 • P.1024 • P.1025 • P.1027 • P.1028 • P.1029 • P.1030 • P.1031 • P.1032 • P.1033 • P.1034 • P.1035 • P.1036 • P.1037 • P.1038 • P.1039 • P.1040 • P.1041 • P.1042 • P.1043 • P.1044 • P.1045 • P.1046 • P.1047 • P.1048 • P.1049 • P.1050 • P.1051 • P.1052 • P.1053 • P.1054 • P.1055 • P.1056 • P.1057 • P.1058 • P.1059 • P.1060 • P.1061 • P.1062 • P.1063 • P.1064 • P.1065 • P.1067 • P.1068 • P.1069 • P.1070 • P.1071 • P.1072 • P.1073 • P.1074 • P.1075 • P.1076 • P.1077 • P.1078 • P.1079 • P.1080 • P.1081 • P.1082 • P.1083 • P.1084 • P.1085 • P.1087 • P.1088 • P.1089 • P.1090 • P.1091 • P.1092 • P.1093 • P.1094 • P.1095 • P.1096 • P.1097 • P.1098 • P.1099 • P.1100 • P.1101 • P.1102 • P.1103 • P.1104 • P.1105 • P.1106 • P.1107 • P.1108 • P.1109 • P.1114 • P.1115 • P.1116 • P.1118 • P.1120 • P.1121 • P.1122 • P.1123 • P.1124 • P.1125 • P.1126 • P.1127 • P.1128 • P.1129 • P.1130 • P.1131 • P.1132 • P.1134 • P.1136 • P.1137 • P.1139 • P.1140 • P.1141 • P.1143 • P.1149 • P.1150 • P.1152 • P.1154 • P.1155 By name Audax • Cygnet • Danecock • Demon • Duiker • Fury • Hardy • Harrier • Hart • Hawfinch • Hector • Hedgehog • Henley • Heron • Hind • Hoopoe • Hornbill • Hornet • Horsley • Hotspur • Hunter • Hunter variants • Hurricane • Hurricane variants • Nimrod • Osprey • P.1052 • P.1072 • P.1081 • P.1127 • P.V.3 • P.V.4 • Sea Fury • Sea Hawk • Tempest • Tomtit • Tornado • Typhoon • Woodcock Hawker Siddeley Andover • Buccaneer • Harrier • Hawk • HS.125 • HS.146 • HS.681 • HS.748 • Nimrod • Sea Vixen • Trident • P.1127 • P.1154

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