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Westland Walrus
The Westland Walrus was a British spotter/reconnaissance aircraft built by Westland Aircraft.
==Design and development==
In 1919 the Royal Navy had an urgent need for a three-seat spotter/reconnaissance aircraft. In order to save money, it was decided to adapt the existing Airco DH.9A, for which part completed airframes were available in large numbers following the end of the First World War and the subsequent cancellation of production orders.〔Thetford 1978, p.344.〕 The initial attempt was carried out by Armstrong Whitworth Aircraft, adding provision for an observer and removing the stagger from the wings to produce the Armstrong Whitworth Tadpole.〔James 1991, p.94-95.〕
Further development, however, was passed on to Westland, who further modified the aircraft to produce the Walrus, with a 450 hp (336 kW) Napier Lion II engine replacing the Liberty engine of the DH.9A and Tadpole. Like the DH.9A, the Walrus was a single-engined, two-bay biplane. It was fitted with an extra cockpit for the observer/radio operator behind the gunner's cockpit, while the observer also had a prone position for observing in a ventral pannier. The undercarriage was jettisonable and the aircraft was fitted with floatation bags and hydrovanes to aid safe ditching, together with arresting gear to aid landing on aircraft carriers. The wings were detachable to aid storage.〔James 1991, p.96.〕〔("The Westland Walrus Fleet Spotter" ) ''FlIGHT'', November 10th 1921, photos showing observers station and flotation bags deployed〕
The prototype first flew in early 1921, proving to have poor flying characteristics, being described by Westland's Test pilot, Stuart Keep as "a vicious beast". Despite this, a further 35 were ordered.〔James 1991, p.96-97〕
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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