Straight wings maximize lift at low speeds through cordwise airflow (leading edge to trailing edge), but at high speeds approaching the critical Mach number, this airflow accelerates to supersonic speeds, forming shock waves that collapse the lift-to-drag ratio and make the aircraft dangerous; sweeping the wings back converts this dangerous cordwise flow into harmless spanwise flow (along the wing's length), preventing supersonic acceleration and maintaining safe flight characteristics.
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Deep Dive
How the F 14 Tomcat Became an Icon of Air CombatAdded:
Here is why it matters. A straight wing maximizes lift at low speeds because nearly all air flow over the wing is cordwise flow air traveling from leading edge to trailing edge generating lift.
But as speed increases, this air flow accelerates over the wing. At the critical Mach number, the air over the wing goes supersonic before the aircraft does. Shock waves form.
The lift-to-drag ratio collapses.
The aircraft becomes dangerous.
Sweeping the wing back converts dangerous cordwise flow into harmless spanwise flow air running along the length of the wing that doesn't accelerate and doesn't threaten to go super.
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