Originally Posted by III Corps

oh.. as for reheat, the first check came at around M1.4 where the engineer verified the ramps and nozzles were working properly. At Mach 1.7 you came out of 'reheat' and Concorde continued to accelerate to about M2.01. Coming out of reheat cut fuel burn approximately in half. (On takeoff in burner, like most fighters, Concorde had about 1hr of fuel on board)