| Wapiti | |
|---|---|
 Wapiti of 55 Squadron RAF | |
| General information | |
| Type | General purpose |
| National origin | United Kingdom |
| Manufacturer | Westland Aircraft |
| Designer | |
| Primary users | Royal Air Force |
| Number built | 558 + 27 licence built in South Africa[1] |
| History | |
| Introduction date | June 1928 |
| First flight | 7 March 1927[1] |
| Variants | Westland Wallace Westland PV-3 |
TheWestland Wapiti was a British two-seat general-purpose military single-engined biplane of the 1920s. It was designed and built byWestland Aircraft Works to replace theAirco DH.9A inRoyal Air Force service.
First flying in 1927, the Wapiti entered service with the RAF in 1928, and remained in production until 1932, a total of 565 being built. It equipped twenty squadrons of the RAF, both overseas (particularly inIndia andIraq) and at home, remaining in RAF service until 1940, also being used by the Air Forces of Australia, Canada, South Africa and India. It also formed the basis for theWestland Wallace which partly replaced the Wapiti in RAF use.
The Wapiti is named for thewapiti, also known aselk, one of the largest species of thedeer family and one of the largest land mammals in North America and eastern Asia.
In 1927, the BritishAir Ministry issuedSpecification 26/27 for a replacement of the elderlyAirco DH.9A, designed during theFirst World War which still equipped theRoyal Air Force's General Purpose squadrons. To save time and money, the specification called for the use of a high proportion of DH.9A components, (as the RAF still held large stores of DH.9A spares), while it encouraged the use of an all-metal structure.[2] A large number of types were tendered to meet this requirement from most of the major British aircraft manufacturers, including Westland, who submitted the design that later became known as the Wapiti. Westland had an advantage in that it had carried out the detailed design work for the DH.9A, and was already a major contractor for the DH.9A.[3]
The Wapiti was a conventional single-engined equal-span two-bay biplane with a slight wing stagger. It had tandem open cockpits and a fixed main undercarriage plus a tailskid. The forward fuselage was of metal tube structure with aluminium-and-fabric covering, while the rear fuselage was of fabric-covered wooden construction. The wings and tail were standard wooden DH.9A components,[4] although later models replaced the wooden parts with an all-metal structure. The Wapiti was powered by a singleBristol Jupiterradial engine, and its crew of two were armed with a forward-firingVickers machine gun and aLewis gun for the observer, while it could carry up to 580 lb (264 kg) of bombs under the wings and fuselage. It was also fitted with radio and photographic cameras, and like the DH.9A before it, could carry a spare wheel for operations in adverse terrain.[5]
The prototype first flew on 7 March 1927.[6] Initial tests showed poor control, and the prototype was modified with a much larger tail and horn-balancedailerons, solving these problems. (It was later discovered that a 2-foot (0.61 m) fuselage section had been omitted from the prototype – as handling was now acceptable, it was not reinstated.)[7] The Wapiti performed well during RAF trials, while using significant amounts of DH.9A components, and was declared the winner of the competition, an initial contract for 25 aircraft being placed in October 1927.[8]
After initial production, the wooden fuselage, tail and wings were replaced by metal structures in the Wapiti II and IIA, and the original long fuselage was eventually reinstated in the Wapiti V and later versions. In 1930, Westland produced an updated version of the Wapiti, the Wapiti VII, which differed so much that it was renamed theWestland Wallace.
The type entered service withNo. 84 Squadron RAF inIraq in June1928.[9] It was heavily used in Iraq and India in the Army Cooperation role, acting also sometimes as a bomber or reconnaissance aircraft. Wapitis of No. 20 squadron escortedVictoria troop carriers in theevacuation of Kabul in December 1928. It was still in service in India until 1942. InBritain, Wapitis served with theAuxiliary Air Force from 1929 to 1937. It was also flown by Australia and Canada, where it saw service at the start of theSecond World War.
The prototypeWapiti V, registeredG-AAWA, was used for demonstration flights in Argentina and Uruguay on floats, powered by a 550 hpArmstrong Siddeley Panther IIA engine.[10] It was later modified as theBristol Pegasus-poweredWestland PV-6or Wapiti VII, re-registeredG-ACBR (also known as theHouston-Wallace after the patronLucy, Lady Houston), for an attempt to fly overMount Everest. Flown by Flt Lt David F. McIntyre and accompanied by aWestland PV-3 the two aircraft became the first to fly over Mount Everest on 3 April 1933. The PV-6 was later designated theWallace Mk I, bearing serialK3488 which introduced a number of improvements. A total of 68 Wapitis were converted toWallace Mk I standard.
The Wapiti was used by the Indian Air Force into the early days of the Second World War. During the Imperial Japanese Navy attack on Ceylon (now Sri Lanka), the Indian Air Force sent 2 Wapitis to patrol off the east coast of India, looking for the Japanese fleet. The southern patrolling Wapiti found nothing, but the northern patrolling Wapiti found a Japanese task force including theaircraft carrierRyujo, and then survived to land undamaged.[11]
(in India)
(in Iraq)
(in the United Kingdom)
All built by Westland at Yeovil
[24] A Westland Wapiti (Serial Number K-813) survives at theIndian Air Force Museum, Palam, Delhi. It is the last surviving aircraft of the type. The fuselage and lower wing of one other (Serial Number K-811) were reported as surviving at the museum's storage facility, but in June 2012 it was determined that only K-811's lower wing survives, albeit in a ruinous condition.[citation needed]
Data from The British Bomber since 1914[25]
General characteristics
Performance
Armament
Related development
Aircraft of comparable role, configuration, and era
{{cite web}}: CS1 maint: numeric names: authors list (link)