Cub, you are absolutely correct re. the 9x sqaure root of tyre pressure etc., but I know of no a/c with the readout you mention. I would imagine that if such an animal exists, it would be some brand new all singing all dancing job that most of us have never seen. I know that the Airbus doesn't have it, and I don't think the Boeing does either.
I would imagine that you best policy (as I'm sure has already occurred) is to use the tyre pressure that the book says your tyres should be inflated to - I'm sure they won't be that far off. Personally, I would work it out for whichever set of tyres (mains or nose) has the lowest pressure and use that speed - thereby ensuring you maintain directional control.
I hear the rain in the IOM has been quite something - no change there then!!
Hope this Helps
SLT
[This message has been edited by SLT (edited 04 October 2000).]