 Complete the following phrase:  The design of the Móka was started in 1937, a year after the first flights of the German DFS Habicht, one of the earliest fully aerobatic gliders, and was rather similar in appearance though different in construction. The Móka did not fly until the spring of 1944. There was a brief period of flight tests, during which the R-17, designed to be capable of was limited to to avoid flutter. These flights revealed very heavy aileron stick loads. It was destroyed in the 