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Flight tests started on the 1/3/1944 with the V-1, which was built as a unpowered glider. The tests were considered by all to be very satisfactory, so the go ahead was given for the Ho IX V-2 which was scheduled to fly in May/June 1944. This aircraft was designed to be to be fitted with a pair of BMW 003 turbojet engines, but the engine type was changed from BMW to Junkers, which meant a major redesign of the center section of the aircraft... delaying the first flight by some time.