Chris says:

snip

I was thinking about converting one into a diver propulsion
vehicle, (DPV, basically a small torpedo that slowly tows
a diver) because they are available much cheaper than DPVs.

snip

By the time you buy all the parts, oil fill what needs to be oil filled,
fabricate your casing, buy your high-pressure bearings, etc, and assemble the
brute, you will have spent more than if you bought the finished product from an
assembly-line with DPV stencilled on the side. Chances are the innards will be
exactly what you are putting in yours, but with the economies of scale built
into the pricing.

HTH ;-)

Steve

Stephen C. Baker - Yacht Designer
http://members.aol.com/SailDesign/pr...cbweb/home.htm