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Since Swiss industry still had no experience with the aircraft and aerodynamics of jet aircraft, several wind tunnel models were produced. In addition, a 3/5th scale wooden glider, the EFW N-20.01 was built to allow testing of the novel wing shape; this flew on 17 April 1948. [1]
Daimler Benz was awarded a contract to develop a 20-ton replacement for the Panzer III. Unlike the Z.W. 40, the VK 20.01(III) was a complete departure from previous designs.