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High Quality Content by WIKIPEDIA articles! On 20 February 1932, Mitchell submitted his Type 224 design. Mitchell referred to the Type 224 as "The Shrew". It first flew on 19 February 1934, but was eventually rejected by the RAF because of its unsatisfactory performance. While the 224 was being built, Mitchell was authorised by Supermarine in 1933 to proceed with a new design, the Type 300, an all-metal monoplane that would become the Supermarine Spitfire. This was originally a private venture by Supermarine, but the RAF quickly became interested and the Air Ministry financed a prototype. Many of the technical advances in the Spitfire had been made by others: the thin elliptical wings were designed by his Canadian aerodynamicist, Beverley Shenstone, and shared some similarities with the Heinkel He 70 Blitz; the under-wing radiators had been pioneered at the RAE, while monocoque construction had been first developed in the United States. Mitchell's genius was bringing it all together with his experience of high speed flight and the Type 224.