Re: [PSUBS-MAILIST] submerged motors

[Ray Keefer <Ray.Keefer@Sun.COM>]

Hi,

Oil and air compensation is used to keep the pressure differential 
between the ambient water pressure at any depth and the internal motor 
case pressure to managable limits. Limits of what? The motor housing is 
typically steel. The real limit is the motor shaft seal. A seal around 
the motor shaft is what really keeps water out.

For instance Minn Kota motors are good to an atmosphere or so. Any 
deeper you have to compensate the motor housing in some manner or the 
pressure differential will force water to seep in through the seal.

Take a look at Busby's book for a general discussion on compensation.

Regards,
Ray

Pierre Poulin wrote:
> Hi Simon,
>
> You can either use mineral and/or electric oil inside the motor or use a 
> scuba regulator to have ambient pressure inside you motor.
>
> hope it help.
>
> Pierre Poulin
> "building a dry-ambient sub"
>
>
>
> > From: SIMON WALKDEN <mrsym0r@gmail.com>
> > Reply-To: personal_submersibles@psubs.org
> > To: Personal_Submersibles@psubs.org
> > Subject: [PSUBS-MAILIST] submerged motors
> > Date: Fri, 24 Sep 2004 11:07:19 +1200
> >
> > Hi all,
> >
> > I'm currently in the process of estimating costs and materials for
> > building my own personal sub. I have, however, become stuck on the
> > section of propulsion.
> >
> > How is it possible to have moving external parts, submerged, without
> > them being flooded with water and ruined?
> >
> > If anyone is aware of a website which gives some insight, or has any
> > helpful tips, any input would be much appreciated.
> >
> > -Simon
> >
> >
> >
> > ************************************************************************
> > ************************************************************************
> > ************************************************************************
> > The personal submersibles mailing list complies with the US Federal
> > CAN-SPAM Act of 2003.  Your email address appears in our database
> > because either you, or someone you know, requested you receive messages
> > from our organization.
> >
> > If you want to be removed from this mailing list simply click on the
> > link below or send a blank email message to:
> >     removeme-personal_submersibles@psubs.org
> >
> > Removal of your email address from this mailing list occurs by an
> > automated process and should be complete within five minutes of receipt
> > of your request.
> >
> > mailto:removeme-personal_submersibles@psubs.org
> >
> > PSUBS.ORG
> > PO Box 311
> > Weare, NH  03281
> > 603-529-1100
> > ************************************************************************
> > ************************************************************************
> > ************************************************************************
>
> _________________________________________________________________
> Balayez vos courriels entrants et sortants et les pièces jointes et 
> contribuez à éliminer les virus destructeurs susceptibles d’y être 
> intégrés. http://join.msn.com/?pgmarket=fr-ca&page=features/virus 
> Commencez dès maintenant à profiter de tous les avantages de MSN Premium 
> et obtenez les deux premiers mois GRATUITS*.
>
>
>
>
> ************************************************************************
> ************************************************************************
> ************************************************************************
> The personal submersibles mailing list complies with the US Federal
> CAN-SPAM Act of 2003.  Your email address appears in our database
> because either you, or someone you know, requested you receive messages
> from our organization.
>
> If you want to be removed from this mailing list simply click on the
> link below or send a blank email message to:
>     removeme-personal_submersibles@psubs.org
>
> Removal of your email address from this mailing list occurs by an
> automated process and should be complete within five minutes of receipt
> of your request.
>
> mailto:removeme-personal_submersibles@psubs.org
>
> PSUBS.ORG
> PO Box 311
> Weare, NH  03281
> 603-529-1100
> ************************************************************************
> ************************************************************************
> ************************************************************************





************************************************************************
************************************************************************
************************************************************************
The personal submersibles mailing list complies with the US Federal
CAN-SPAM Act of 2003.  Your email address appears in our database
because either you, or someone you know, requested you receive messages
from our organization.

If you want to be removed from this mailing list simply click on the
link below or send a blank email message to:
	removeme-personal_submersibles@psubs.org

Removal of your email address from this mailing list occurs by an
automated process and should be complete within five minutes of receipt
of your request.

mailto:removeme-personal_submersibles@psubs.org

PSUBS.ORG
PO Box 311
Weare, NH  03281
603-529-1100
************************************************************************
************************************************************************
************************************************************************