Re: concrete weight

[protek@shreve.net]

Jon,
    By now everyone knows what I think of the concrete idea, but here is a
thought.  My sub has a 36 inch outer diameter and a wall thickness to the
steel of 0.360 inch (almost 3/8 inch).  I did not until tonight know what
concrete weighed, but you stated that it weighs approximately 150
pounds/cubic foot.  Steel weighs approximately 490 pounds/cubic foot.  This
means that steel weighs 3.27 times as much as concrete.  Now, if I had
built my sub out of concrete, then the hull would be 3.27 times 0.360
inches or 1.17 inches thick.  Imagine a hull 3 feet in diameter and 1.18
inches thick made from concrete.  One might say "Make the hull thicker",
but weight come into play here.  Would anyone be satisfied with a 1.2 inch
thick concrete hull?

Just trying to encourage some thought here...


Gary Boucher