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Hi Jon.
As always, thanks for the helpful info. Sorry but I
don't know how much more complex or expensive water pumps would be over regular
motor driven props,
since I do not know that much about the water pumps
used on subs. I know how a well pump works and a bilge pump, but I am not
knowledgeable enough
to make the determination you ask
about.
Bill Akins.
----- Original Message -----
Sent: Tuesday, April 11, 2006 10:09
AM
Subject: RE: [PSUBS-MAILIST] Water nozzle
propulsion
Bill,
Yes
it's exactly the same idea as a jetski, although modern jetski's use an axial
"impeller" (if you can call it that...I'm not sure what the exact term is) and
I suspect most subs would use a centrifugal type impeller (like in a
bilge pump). Also note, that some small home-made unmanned submersibles
use bilge pumps as their propulsion device. I've seen small projects
where they mount four to six bilge pumps, each in a different direction, to
provide all range of motion required.
I
wonder though, is this type of design more complex and/or more expensive than
pressure compensating the electric motors? From a monetary and
complexity perspective, how do they compare?
Jon
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