11. These were believed to be the source of the stability problems at transonic speeds up to XB-35 and YB-49 aircraft. 12. He and chief engineering test pilot Milo Burcham alternated flying dive tests to observe the design's performance at transonic speeds . 13. At transonic speeds ( around Mach 0.8 to Mach 1.3 ), it has a better lift-to-drag ratio than a conventional wing. 14. It was designed to undertake reconnaissance mission at a depth of several hundred kilometers from the front lines at transonic speeds . 15. In terms of performance, the aircraft was expected to have better aerodynamic performance at medium to low altitudes and at transonic speeds . 16. A supercritical airfoil is an airfoil designed, primarily, to delay the onset of wave drag on aircraft in the transonic speed range. 17. Both of the Messerschmitt types had swept wings to delay the onset of small shock waves and the accompanying drag at transonic speeds . 18. There is no magical technology on the Sonic Cruiser that allows it do what other jets have not-- fly efficiently at transonic speeds . 19. He emphasized the need to study the dangerous regime of " shock stall ", and to safely transition through transonic speed and beyond. 20. During high-thrust settings the fan blades at the intake of a turbofan engine reach transonic speeds , causing a sudden drop in air pressure.
