It is the strategic bomber which challenged Mach 3 for the first time in the world. It became the good model of supersonic airliners, such as next Concorde and TU144. Is also that it says that these supersonic airliners were produced by irony in countries other than the United States also a historical mischief? At the time of a flight at supersonic speed, the main wings are bent under 65 degrees in this way. Of course, it is usually returned to a level position. This could also be called swing wing machine.