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<p>of the aircraft, which has to supply extra <a href="page.php?w=thrust">thrust</a> to make up for this energy loss. Thus the shocks are seen as a form of <a href="page.php?w=drag_%28physics%29">drag</a>. Since the shocks form when the local air velocity reaches supersonic speeds, there is a certain "<a href="page.php?w=critical_mach">critical mach</a>" speed where sonic flow first appears on the wing. There is a following point called the <a href="page.php?w=drag_divergence_mach_number">drag divergence mach number</a> where the effect of the drag</p><p>
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