Grumman built TBF-1 series Avengers and General motors their identical TBM-1 series aircraft, both of which had a 1,700 hp engine. The HTC Avenger however is a TBM-3 which had a 1,900 hp engine and rocket rails. By the time the TBM-3 was ready for production the Grumman factory had stopped making Avengers so there were no TBF-3s produced.