1. At transonic speeds , the flow field around the object includes both sub-and supersonic parts. 2. Aircraft flying at transonic speed often incur wave drag through the normal course of operation. 3. The results of these tests confirmed the drag reduction offered by swept wings at transonic speeds . 4. Severe instability can occur at transonic speeds . 5. Meanwhile, aerodynamicists in the company discovered that the A-4b's swept wing design was inherently unstable at transonic speeds . 6. Developers turned to Full Potential codes, as panel methods could not calculate the non-linear flow present at transonic speeds . 7. The MiG-15 was one of the first successful jet fighters to incorporate swept wings to achieve high transonic speeds . 8. A "'supercritical airfoil "'is an airfoil designed, primarily, to delay the onset of wave drag in the transonic speed range. 9. Further experience and research during World War II later established that swept wings would give better performance at transonic speeds . 10. In the initial stage of Cold War, bombers were expected to attack flying higher and faster, even at transonic speeds .
