[PSUBS-MAILIST] Pressure compensation

[Chris Nugent <dirkpitt77@yahoo.com>]

     Hey guys, 

   I've pretty much scoured the archives looking for
posts which deal with pressure compensating motors
such as the trolling motors we've been talking about. 
Although I've read a lot on there, there didn't seem
to be much in the way of explanation.  Anyway, there
was no crack of lightning that hit me, so I'm still in
the dark.  What exactly IS pressure compensation, why
is it important, and how do you do it?  From what I
could glean, it apparently is a way of making your
motors or what-have-you more resistant to the high
pressures encountered at depth by encasing them in
some kind of airtight case and then pressurizing it
with a gas or liquid until the pressure inside will
roughly equal, or compensate for, the pressure
outside.  Am I on the right track here?  Do I need to
even worry about it if my boat's only going to go to
about 150 feet max depth or so?  
    If somebody wants to jump in and clarify a little
for me, I'd appreciate the enlightenment.  Thanks!

                                    Laters,

                                        Nuge

=====
"Noisy outside, empty inside." - Confucius

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