The T-10S-3 was modified and officially designated the P-42, setting a number of world records for time-to-height,[21] beating those set in 1975 by a similarly modified F-15 called "The Streak Eagle".[22] The P-42 "Streak Flanker" was stripped of all armament, radar and operational equipment. The fin tips, tail-boom and the wingtip launch rails were also removed. The composite radome was replaced by a lighter metal version. The aircraft was stripped of paint, polished and all drag-producing gaps and joints were sealed. The engines were modified to deliver an increase in thrust of 1,000 kg (2,200 lb), resulting in a thrust-to-weight ratio of almost 2:1 (for comparison with standard example see Specifications).[23][24]