On Sat, Mar 20, 2010 at 05:23:57PM -0400, Kurt Feltenberger wrote:

> Thanks for the fast reply. What about durability? My concern is that the  
> boat is going to be functioning in an environment where dedicated port  
> facilities won't always be available and so damaged props or rudders  
> could be a mission kill. Are the water jets more durable?

For vessels in this sort of size class, fixing a propeller is basically
a dockyard job. Carrying spare impellers and replacing them in the field
_should_ be possible, if the ship's designed for it (i.e. you can drain
the tunnels while afloat) - and I don't see why you wouldn't design a
ship this way.

Note that "smaller draught requirement" - lots of things that would foul
a conventional prop won't happen to an impeller, because you don't have
a fast-moving fragile thing hanging off the bottom of the ship.

R
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