Re: [PSUBS-MAILIST] enquiry - Propulsion

["steve" <steve@kobol.worldonline.co.uk>]

Dan, thanks for the info.

Does anyone have any data regarding Minn Kota trolling motors?  i've been on
the website and downloaded the motor selection guide but i want to know what
depth they are actually rated for and the physical size of the motor housing
Can anyone tell me the 'official' depth rating and the 'unofficial' depth
that anyone has sucessfully used them?
I think i have seen pics of them being used as main thrusters on subs?

Best Regards

Steve Bosworth
UK

----- Original Message -----
From: "Dan H." <JMachine@adelphia.net>
To: <personal_submersibles@psubs.org>
Sent: Wednesday, September 24, 2003 3:32 AM
Subject: Re: [PSUBS-MAILIST] enquiry - Propulsion


> Steve,
>
> Sorry I took so long but I kept forgetting to check the supplier when I
was
> at my shop.  This is the web site for the company I purchased my shaft
seals
> from. http://www.ussealmfg.com/
>
> Some of their seals are not too high priced and others are surprisingly
> pricey.  I explained my application to their staff and I purchased the
seal
> they recommended.  I believe it was about $35 US.  There are other
suppliers
> for this type of face seal but these folks were helpful and they had what
I
> needed.
>
> Good luck, Dan H.
>
> ----- Original Message -----
> From: "Dan H." <JMachine@adelphia.net>
> To: <personal_submersibles@psubs.org>
> Sent: Friday, September 19, 2003 8:49 AM
> Subject: Re: [PSUBS-MAILIST] enquiry - Propulsion
>
>
> > I don't have the supplier at my finger tips but will get it for you.
When
> I
> > was talking to their factory engineer he told me that the way they work
> is,
> > that they do actually get hot on their contact surfaces, although not
> really
> > detectable to the observer.  The contact surfaces are precision finished
> and
> > must be free from the slightest bit of oil.  The few molecules of water
> that
> > try to get in-between the two rotating surfaces is actually evaporated
off
> > by the friction of the seal.
> >
> > Kittredge subs used them in all their thrusters and had never had a
> problem.
> > Their a common rotary pump seal but a bit pricey.
> >
> > Dan H.
> > ----- Original Message -----
> > From: "steve" <steve@kobol.worldonline.co.uk>
> > To: <personal_submersibles@psubs.org>
> > Sent: Thursday, September 18, 2003 3:39 PM
> > Subject: Re: [PSUBS-MAILIST] enquiry - Propulsion
> >
> >
> > > Hi Dan
> > >
> > > i haven't tried carbon ceramic seals, my experimental thruster uses a
> > viton
> > > rotary shaft seal.
> > > i started with a nitrile seal but even at low revs i found the
friction
> > > started to melt the seal, the viton seal is harder wearing but i find
> that
> > > the shaft movement and the pressure lets some water in so i was
looking
> at
> > > other ideas.
> > >
> > > Do you know of a supplier where i could get these seals from.
> > >
> > >
> > > Steve Bosworth
> > > UK
> > >
> > >
> > > ----- Original Message -----
> > > From: "Dan H." <JMachine@adelphia.net>
> > > To: <personal_submersibles@psubs.org>
> > > Sent: Thursday, September 18, 2003 12:43 PM
> > > Subject: Re: [PSUBS-MAILIST] enquiry - Propulsion
> > >
> > >
> > > > Steve,
> > > >
> > > > Have you tried carbon ceramic face seals that are used in rotary
water
> > > > pumps.  They have a spring loaded carbon face that mates to a
> stationary
> > > > ceramic face and will work well even under considerable pressure.
> > > >
> > > > Dan H.
> > > >
> > > > ----- Original Message -----
> > > > From: "steve" <steve@kobol.worldonline.co.uk>
> > > > To: <personal_submersibles@psubs.org>
> > > > Sent: Wednesday, September 17, 2003 7:56 PM
> > > > Subject: [PSUBS-MAILIST] enquiry - Propulsion
> > > >
> > > >
> > > > > Hi All
> > > > >
> > > > > i have a question regarding propulsion but not for surface travel.
> > > > >
> > > > > I am trying to research (small ROV size) thrusters with a
> magnetically
> > > > > coupled shaft but am not able to find much on the subject.
> > > > >
> > > > > my own design thrusters are ok but i am having to look at filling
> them
> > > > with
> > > > > oil to maintain the sealing.
> > > > > i would like to do some experimenting and was wondering, is there
> > anyone
> > > > on
> > > > > the list who has built such a device or can point me in the right
> > > > direction?
> > > > >
> > > > > any ideas would be appreciated
> > > > >
> > > > > Steve Bosworth
> > > > > UK
> > > > >
> > > > >
> > > >
> > > >
> > >
> > >
> >
> >
> >
>
>