(Regnirps) wrote:

I think these results must apply to a limited set of circumstances. For
instance, viscosity is fixed (water) and depth is shallow enough to avoid
turbulence, as in a skin boards on an ocean beach or a sheet of paper sliding
across a desk on a thin film of air. Once the depth is great enough for
turbulent flow you should get a whole new ball of wax and I would expect the
simple formula to fail.

-- Charlie Springer

Could very well be...I don't recall that being mentioned in the
study. I was very interested in it at the time and read it and
any other data thoroughly...mind you, that was some 40 or more
years ago and we didn't have Google...
--

-Gord.