While many of you may not have heard about this aircraft, I have a few questions. Everything written about the aircraft says it was supposed to cruise at mach 3, but only reached mach 1.3 in testing. Also, they say the only one that flew was BELIEVED to set a record of mach 1.89 over a 2000 km circuit. Do you think that this record shows that the aircraft actually couldn't go mach 3 and maybe the project was cancelled because it couldn't reach it's design goal? By the way, the only surviving airframe is at the Monino Museum.