Jet turbine engines

> I am working on designing a boat the uses a submerged jet turbine
> engine...

Two questions:
*Did you want the boat to be propelled by jet exhaust, or can the jet
engine power a propeller?
*Can your jet engine get air via a snorkel, or will some of the boat
be above water?

I know the quite a few US Navy surface combatants (warships) use jet
engines derived from the DC-10's engine. Further, I think those
engines are below the waterline of the ship (or near it). However, a
lot of those ships' structures (including engine air intakes) are
above water, and the exhaust is simply vented out a smoke stack. The
jet engines' turbines connect to a propeller via a reduction gear box.

Actually, turboshaft engines are pretty common in naval vessels. Some
ships will putter around on diesels most of the time and switch to the
fuel-hogging turbines for "boost" power, while others (like US Navy
frigates and destroyers) just use their turbines all the time.

I know at least one racing boat has used a couple of gas turbine
engines, too.

Mike Miller, Materials Engineer