An aircraft (100) designed for transonic speed comprises an airfoil (102), a nacelle (122), an engine (116), and an inverted V-tail (114).

When the structure is moved at a transonic speed; a shock forms adjacent to its surface and the shock bumps perturb the shock (9) so as to reduce its angle of sweep.

The Mach number is critical because a number of phenomena take place just around Mach 1 (transonic speed), for example a sudden increase in drag induced by shock-wave generation (sonic-boom).