XB-51 has 3 turbojet engine. It is so called tri-jet and is very unique low-level bomber with bubble canopy. The main wing swept at 35 degree with 6 degree anhedral(anhedral is opposite of dihedral) do not have fuel tanks inside. Its first flight was in 1949. Only 2 XB-51 were built and did not produce in large quantities because USAF decided to adopt English Electric Canberra as B-57 instead of XB-51. Unfortunately, both ot 2 prototypes were lost; #1 XB-51 was lost in 1956, #2 was in 1952.
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