Good addition Rick,
I completely forgot about air compensation. I was thinking of passive
compensation systems.
Dan H.
----- Original Message -----
From: "Rick and Marcia" <empiricus@telus.net>
To: <personal_submersibles@psubs.org>
Sent: Saturday, December 31, 2005 4:37 PM
Subject: Re: [PSUBS-MAILIST] Advice for a newbie?
[snip]
3 There are two ways of water proofing a thruster. One method is to
fill
the thruster with some fluid, usually oil, so there is no room for water
to
enter. The other way is to design your motor pod or shaft drive through
hull with a pump shaft type seal. For low pressure there are rubber
seals
on the market, but to go deeper, it's best to use a carbon and ceramic
face
type seal. These are used in water pumps to keep water from dribbling
out
all the time. You just install it backward, so water doesn't dribble
in.
[snip]
Hi - another thought on Dan's offering is to compensate the motor pod
with a
line running to a scuba tank. The regulator from the tank compensates
the
pod automatically. The standard seal from the manufacturer doesn't have
to
be tinkered with using this method. The one thing you will have to do
is
drill/tap a hole in the motor casing to run the line(s) and the
through-hull.
There may be more than one item that needs compensating, like fore and
aft
trim tanks in the case of magical Child. I will be running lines not
from a
tank directly but from a manifold.
Rick L
Vancouver
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