Bf. 109X -A new forward fuselage was designed and a new full vision "bubble" canopy was fitted. The aircraft flew in 1939. The second radial engined Me-109X used the BMW 801 however. The aircraft flew in September 1940 and was tested by the RLM. The RLM decided however that the FW-190 was performing well and that there was no need for a similar powered fighter. Therefore the program was ended in 1941.