On Tue, 15 Feb 2005 05:44:51 -0700, Keith Hughes
wrote:

The important point is that where the
*volume* of the 8000lb of boat is greater than that of 8000lb of water
(i.e. lower density), the boat floats. Density greater than
water...glug, glug, glug...

Exactly why it's hard to fly a steam-powered airplane and to sell a
ferro-cement boat. No matter how good they are, something seems to be
defying the laws of nature in a concrete canoe. G

R.