 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.The aircraft was equipped with a JATO solid rocket motor, which was able to be started independently to reach the necessary altitude for tests.