"Richard Casady" wrote in message
...
On Mon, 23 Feb 2009 17:16:17 -0600, "KLC Lewis"
wrote:

A water-filled rudder? That's a new one on me. I saw an ad once for a
water-filled anchor that was just the cat's pajamas. Empty it out, it's
really light. Fill it up, it gets really heavy. Fill it with fresh water
and
you have an extra supply of drinking water to boot.

The weight of water in water is nothing. In other words the thing will
be so bulky that its bouyancy will result in nearly no effective
weight. Anchors need to be dense as well as heavy, the weight in the
water is all that counts.

Casady

Uh, yeah. That's a given, I think.