aircraft atmosphere atmospheric reentry australia brazil china classified computational fluid dynamics concorde darpa dark empire defence science and technology organisation density earth flame holder france fuel funnel futurama germany gravity drag henry spencer hyshot hydrogen hypersonic india inlet cone israel italy japan jet aircraft jet airliner kinetic energy liquid air cycle engine liquid hydrogen liquid oxygen list of emerging technologies los angeles mach number nasa north american aviation nozzle pressure pulse detonation engine qinetiq ramjet rocket russia shock wave silane solid rocket booster sonic boom space shuttle external tank space shuttle program space capsule spacecraft specific impulse stagnation temperature star wars stealth technology stiff equation stratosphere straw man subsonic supersonic supersonic transport sweden sydney television movie turbine turbofan turbojet united kingdom united states navy university of queensland velocity waverider wide-body aircraft woomera prohibited area world war ii