Let's take some hypothetical figures: an aircraft gets airborne at, say, 100 knots and accelerates to 150 knots with the wheels still spinning. The air velocity past the bottom of the wheel is 50 knots while the velocity over the top of the spinning wheel is now 250 knots. Given that drag increases as a square of the air velocity what is the total drag of the rotating wheel compared with a non-rotating wheel? Just nit-picking for the fun of it
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