Picture I http://crisisofdemocracticstates.blogspot.com/p/difficulties-in-making-fastest-aircraft.html Kimmo Huosionmaa SR-71 "Blackbird" is the fastest known aircraft in the world. Making ultra-fast aircraft is not easy, because the heat in the atmospheric fly is very high, and that's why that very fast aircraft must rise above the tight layers of the atmosphere. The friction is the very bad problem, and that's why those aircraft must equip with the carbon fiber core, what would stand the extreme heat and pressure without melting. But the raise above the tight layers of the air would cause the problems because the jet motors cannot get enough air, and that's why the power of those machines would decrease. One solution would pump the oxygen to the turbines from the liquid oxygen tanks, but that would cause decreasing the payload of that aircraft. And also oxygen tanks would decrease the flight time. So there must create the solution, what allows the m...