PPRuNe Forums - View Single Post - Aquaplaning Formulae Why the Diff???

12th February 2006 | 09:20

#3 (permalink)

TheOddOne

Joined: Sep 2004

Posts: 1,684

Likes: 3

From: Down at the sharp pointy end, where all the weather is made.

160kt,
I only know of one formula:
Tyre pressure (Tp) in Pounds per Square Inch (psi) speed in Miles Per Hour (mph)
for a smooth tyre, the aquaplaning speed = 9 x √Tp
Thus, for a tyre inflated to 25psi, speed = √25 x 9 = 5 x 9 = 45mph
for a tyre inflated to 100 psi, speed = √100 x 9 = 10 x 9 = 100 mph.
Hence, the higher the tyre pressure, the higher the speed before it will aquaplane.
What's the 'other' formula?
Cheers,
TheOddOne

Last edited by TheOddOne; 12th February 2006 at 10:38.