If I remember sand varies depending on the type of sand, but is about 100 pounds per cubic foot, whereas lead is over 700 pounds per cubic foot, meaning you need a lot of sand storage area. I actually went down that road with a design. But I figured on just using a dredge or shovel to load the sand. http://www.submarineboat.com/sub/Sub_H2_files/h2.html -- No tongue in cheek :) DougIn a message dated 11/7/2005 4:27:03 PM Central Standard Time, paulkreemer@gmail.com writes:Bill, yeah the sand ballasting was kind of a tongue in cheek suggestion. I was trying to get creative and spur some discussion on ballasting a large air volume and still make it trailerable. Also I haven't looked up the density of sand but expect that it wouldn't compare well to lead or even concrete. :-)
Way more practical to go with a semi-dry compartment like you suggested.
Paul
On 11/7/05, Akins < lakins1@tampabay.rr.com> wrote:Hi Joe.