Another Aquaplaning Formula
The formula for aquaplaning speed in Knots is 9 x square root of tyre pressure in PSI.
The formula for aquaplaning speed in Miles per Hour is 10.4 x square root of tyre pressure in PSI. Forget where I read this---was many years ago.
Now think about driving a Volkswagon Beetle where I believe the front tyre pressure is 16 PSI.
So using the last formula we arrive at an aquaplaning speed of 41.6 MPH.
Not a good idea to speed in the wet then.!!!