> Once you get it REALLY leaning backwards you could conceivably
> decelerate at a healthy fraction of one g !

At 45 degrees angle you could brake at 1g and experience 1.4g's.

> As you approach horizontal the flipping moment approaches zero but the
> stopping friction also approaches zero.

If you are braking in equilibrum and not falling over backwards then the
vertical force on the board will NOT decrease. Your 'weight' would
increase due to the g's, and the respective (cosine) force on the board
would be compensated exactly.

Whether the control systems could take it is another matter. I have seen
circus bicycles doing tricks at almost 45 degrees (braking or
accelerating) with no trouble (and a wet control system well hidden behind
makeup and large false ears and nose). No problems, once the system is
properly trained ;-).

Peter

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