[PSUBS-MAILIST] How to do external electric thrusters?

["Marten Liebster" <mliebster@tbteam.com>]

Hugo,

Thanks for your response. I have a couple of questions. 

How do you seal the hull with the electrical connections?
(in a thread entitled "Sound Absorption" you gave the URL:
http://www.seaconbrantner.com/)

Do you just leave the wires exposed?

How do you enclose the motor to make it water tight?

Will pressure have an adverse affect on the motor? 
If so, do you need to compensate for the pressure?


As my questions clearly show I'm a psub newbie. So any info will be
extremely helpful.

Marten

-----Original Message-----
From: owner-personal_submersibles@psubs.org
[mailto:owner-personal_submersibles@psubs.org] On Behalf Of Hugo Marrero
Sent: Thursday, April 29, 2004 10:48 AM
To: 'personal_submersibles@psubs.org'
Subject: RE: [PSUBS-MAILIST] Sound Absorption

Marten,

If you use a hydraulic accumulator sized properly to your application, the
pump will not run continuosly. Also make sure you use flow restrictors to
keep the flow to each motor to the optimum flow and no more.

For electrical you can design an external thruster and the penetrations
would only be electrical, which are extremely safe. That's the way we run
our subs and they've been doing it that way for 30 years.

We are now upgrading to brushless DC thrusters and all of them will be
networked. The control cable is only 3 wires through a single penetrator. It
certainly beats the heck out of messing with an oil mess inside the sub,
which WILL occurr.

Hope this helps,

Hugo