Naval Fighters Number Thirty-Three XTBU-1 & TBY-2 Sea Wolf
In 1939 with war on the horizon, the U.S. Navy's Bureau of Aeronautics sent the aviation industry a request for proposal for a new torpedo-bomber (VTB). The competition was won by Grumman with its XTBF-1 proposal. Known as the Avenger, two XTBF-1 prototypes were ordered in the spring of 1940. Vought also had a promising proposal and was awarded a contract for one XTBU-1 prototype.
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