Discussion
Doubling the true airspeed of an aircraft, all else equal, changes the dynamic pressure by a factor of
Answer: A
Correct answer: Four
Dynamic pressure is \( \frac{1}{2}\rho V^2 \), so doubling the speed quadruples it - and quadruples the lift and the parasite drag with it. The square law is why a small increase in cruise speed costs so much in thrust, and why structural loads rise so sharply with airspeed.
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