Vickers Wellesley

infobox Aircraft
name = Wellesley
type = General purpose bomber
manufacturer = Vickers-Armstrongs Ltd

---

caption = Type 292 of the Long-Range Development unit. Unlike production Wellesleys, the engine cowling is blended with the fuselage profile.
designer = Barnes Wallis
first flight = 19 June avyear|1935
introduction = avyear|1937
retired = avyear|1944
status =
primary user = Royal Air ForceThe Vickers Wellesley was a British 1930s light bomber built by Vickers-Armstrongs for the Royal Air Force. While it was obsolete by the start of the Second World War, and unsuited to the European air war, the Wellesley was successfully used in the desert theatres of East Africa, Egypt and the Middle East.

Design and development

The design originated from the Air Ministry Specification G.4/31 which called for a General Purpose aircraft, capable of carrying out level bombing, army co-operation, dive bombing, reconnaissance, casualty evacuation and torpedo bombing. The Vickers Type 253, which used a radical geodesic airframe construction that was derived from that used by Barnes Wallis in the airship R100, was tested against the specification along with the Fairey G.4/31, Westland PV-7, Handley Page HP.47, Armstrong Whitworth A.W.19, Blackburn B-7, Hawker P.V.4 and the Parnall G.4/31. The Type 253 was declared the winner, with 150 being ordered.

The Vickers Type 246 monoplane, which used the same geodetic design principles for both the fuselage and wings, was then built as a private venture, first flying on the 19 June 1935Mason 1994.] and offered to the RAF. This had superior performance, but did not attempt to meet the multi-role requirements of the specification, being designed as a bomber only. An initial order for 96 Type 246s was substituted for the Type 253 order. The RAF ultimately ordered a total of 176 as the "Wellesley", to a newly written specification 22/35, with a 14-month production run starting in March 1937. Crosby 2007, p. 145.]

The Wellesley was a single-engined monoplane with a very high aspect ratio wing, and a manually operated, retractable undercarriage. As it was not known how the geodetic structure could cope with being disrupted by a bomb bay, the Wellesley's bomb load was carried in two streamlined panniers under the wings. The Wellesley Mk I had two separate cockpits, but this was changed in the Wellesley Mk II to a single-piece cockpit canopy covering both the pilot and navigator positions.

Operational history

The RAF received its first Wellesleys in April 1937, serving with No.76 Squadron at Finningley, and eventually equipped six RAF Bomber Command squadrons in the UK. Five aircraft with provisions for three crew members were modified for long-range work with the RAF Long-Range Development Flight. Additional modifications included the fitting of Pegasus XXII engines and extra fuel tanks. On 5 November 1938, three of them under command of S/L R. Kellett flew non-stop for two days from Ismailia, Egypt to Darwin, Australia (7,162 miles, 11,525 km) setting a world distance record. All three aircraft succeeded in breaking the existing record, but No. 2 aircraft landed in West Timor, 500 miles short of the final objective. The Wellesley's record remained unbroken until November 1945. [ Barfield 1973, p. 89.]

The primary use of the Wellesley during the Second World War was in overseas theatres of operation, mainly in the Middle East, with only four examples remaining in Britain at the start of the war. Among its significant wartime operations was the bombing of Addis Ababa in August 1940, remaining in the region until 1941 performing maritime reconnaissance duties.

While the Wellesley was not a significant combat aircraft, the design principles that were tested in its construction were put to good use with the Wellington medium bomber that became one of the main types of Bomber Command in the early years of the European war.

Variants

;Type 281 Wellesley: Company designation for the Wellesley bomber.;Type 287 Wellesley Mk I: Two-seat medium bomber aircraft. The Wellesley Mk I had two separate cockpits.;Wellesley Mk II: The Mk II had a single-piece cockpit canopy.;Type 289: Engine testbed. It was used to test the Hercules HE15 radial piston engine.;Type 291: Blind-flying model.;Type 292: Three aircraft were modified for long-distance flying. The aircraft were used by the RAF's Long-Range Development Flight.;Type 294: Prototype with strengthened wing.;Type 402: Three-seat experimental aircraft.

Operators

; UK
* Royal Air Force
** No. 7 Squadron RAF
** No. 14 Squadron RAF
** No. 35 Squadron RAF
** No. 45 Squadron RAF
** No. 47 Squadron RAF
** No. 76 Squadron RAF
** No. 77 Squadron RAF
** No. 117 Squadron RAF
** No. 148 Squadron RAF
** No. 207 Squadron RAF
** No. 223 Squadron RAF
** No. 267 Squadron RAF

pecifications (Wellesley)

aircraft specifications

plane or copter?=plane
jet or prop?=prop
ref=The Wellesley: Geodetics in Action Air International July 1980, p.31.]
crew=Two
length main=39 ft 3 in
length alt=11.96 m
span main=74 ft 7 in
span alt=22.73 m
height main=15 ft 3½ in
height alt=4.67 m
area main=630 ft² Andrews and Morgan 1988, p.308]
area alt=58.5 m²
empty weight main=6,760 lb
empty weight alt=3,066 kg
loaded weight main=11,048 lb
loaded weight alt=5,011 kg
max takeoff weight main=12,500 lb
max takeoff weight alt=5,670 kg
engine (prop)=Bristol Pegasus XX
type of prop= radial piston engine
number of props=1
power main=925 hp
power alt=690 kW
max speed main=228 mph
max speed alt=198 knots, 369 km/h
max speed more= at 19,700 ft (6,000 m)
cruise speed main=180 mph
cruise speed alt=157 knots, 290 km/h
cruise speed more= at 15,000 ft (4,600 m) (57% power)
range main=1,220 miles
range alt=1,963 km
ceiling main=25,500 ft
ceiling alt=7,772 m
climb rate main=
climb rate alt=
loading main=18 lb/ft²
loading alt=86 kg/m²
power/mass main=0.08 hp/lb
power/mass alt=0.14 kW/kg
more performance=*Climb to 15,000 ft (4,600 m): 17.8 min
guns=

** 1 x .303 (7.7 mm) Vickers machine gun in right wing
** 1 x .303 (7.7 mm) Vickers K machine gun in rear cockpit
bombs=2,000 lb (908 kg) of bombs

ee also

aircontent
related=
* Vickers Wellington
lists=
* List of aircraft of the RAF
similar aircraft=
* Heinkel He 70
* Fairey Battle

References

Notes

Bibliography

* Andrews, C.F. and Morgan, E.B. "Vickers Aircraft since 1908". London: Putnam, Second Edition 1999. ISBN 0-85177-815-1.
* Barfield, Norman. "Vickers Wellesley Variants (Aircraft in Profile 256)". Windsor, Berkshire, UK: Profile Publications Limited, 1973.
* Crosby, Francis. "The World Encyclopedia of Bombers". London: Anness Publishing Ltd., 2007. ISBN 1-84477-511-9.
* Mason, Francis K. "The British Bomber since 1914". London: Putnam Aeronautical Books, 1994. ISBN 0-85177-861-5.
* "The Wellesley: Geodetics in Action". "Air International". Bromley, Kent:Pilot Press. Volume 18 No. 1, July 1980. Pages 25-33, 49-50. ISSN 0306-5634.

External links

* [http://www.britishaircraft.co.uk/aircraftpage.php?ID=56 British Aircraft Directory entry]