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What's a piece of esoteric knowledge you have? (lemm.ee)

submitted 2 days ago by Irelephant@lemm.ee to c/asklemmy@lemmy.ml

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[–] captain_aggravated@sh.itjust.works 5 points 11 hours ago

From an old edition of the Pilot's Handbook of Aeronautical Knowledge:

An airplane's tire will hydroplane at a speed in knots equal to 9 times the square root of the tire pressure in PSI. So if your tires are inflated to 36 PSI, sq.rt 36 = 6 * 9 = 54 knots. If there is standing water on the runway, you will have no braking authority or steering control from the wheels, you will have to maintain control of the aircraft with the flight controls, and you cannot rely on short field stopping figures from the POH if it requires applying brakes above 54 knots.

I got that out of the 2003 edition; I don't know if it's in the current issue.