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Westland CL.20
The Westland CL.20 was a two-seat autogyro designed and built by Westland Aircraft between 1934 and 1938. One flying prototype and six airframes were built, which had control problems and insufficient lift. Before these problems could be solved the programme was abandoned and the prototype was scrapped in 1938.
==Development==
Before the Westland C.29 had proven to be a failure W.E.W. Petter (Teddy) sought to design another cabin autogyro in collaboration with George Lepère, a French autogyro designer with the Lioré et Olivier aircraft manufacturer. The initial design was by Georges Lepère in association with the Cierva Autogiro Company and was based on the Cierva-Lepère C.L. 10B. Detailed design was by Westland's Arthur Davenport and Teddy Petter.〔
Construction was completed in December 1934 and in January 1935 taxi-ing trials were carried out at Yeovil by Harald Penrose, after which it was transported to the Cierva flight test centre at Hanworth Aerodrome, where Juan de la Cierva flew the prototype on its first flight on 5 February 1935. During development flying, carried out by R.A.C. Brie,〔 the CL.20 exhibited over-sensitive lateral control and was unable to exceed a height of . To improve lift, a more powerful Niagra engine was fitted but this made little difference.〔
Despite the poor performance of the prototype, Teddy Petter persuaded Westland to manufacture another six airframes, but further development was abandoned due to emerging work as a result of the threat of war. At the end of development flying the prototype had logged 8 hours 31 minutes flying time over 61 flights, before the flying prototype was scrapped in 1938.〔
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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