RE: [PSUBS-MAILIST] external Motors for depths of 1000ft

["Graham K" <cryogenicz@dsl-only.net>]

When I was 10, I went to Germany with my family to visit our foreign
exchange students parents. We go off on the airport in Hesse Frankfurt
airport, and then we went to some other surrounding cities... Hamburg,
Berlin, saw the Rhein river, I cant remember every detail, (I was only 10)
but I know that Bremen isn't too far, and I think I visited it.. I know I
saw about 100 castles!
Germany is a Great place, I want to visit again.

-Graham Kuberski

-----Original Message-----
From: owner-personal_submersibles@psubs.org
[mailto:owner-personal_submersibles@psubs.org]On Behalf Of Carsten
Standfu?
Sent: Friday, June 21, 2002 7:10 AM
To: personal_submersibles@psubs.org
Subject: Re: [PSUBS-MAILIST] external Motors for depths of 1000ft


Graham K schrieb:
>
> Where in Germany are you?

Northern Germany, 30 km N from Bremen direct on the River Weser. Why ?

Carsten

> -----Original Message-----
> From: owner-personal_submersibles@psubs.org
> [mailto:owner-personal_submersibles@psubs.org]On Behalf Of Carsten
> Standfu?
> Sent: Thursday, June 20, 2002 3:40 PM
> To: personal_submersibles@psubs.org
> Subject: Re: [PSUBS-MAILIST] external Motors for depths of 1000ft
>
> rjune@fuse.net schrieb:
> >
> > Both Minnakota and Motorguide motors are factory warranted
> > to a depth of 33 feet.
> > If you use them deeper than that (without modifying them) than you are
> > relying on the shaft and body seals to hold back the pressure.
> > Because the body seal is a static o-ring seals it will easily hold
> > back 400 to 500 psi (equivalent depth of aprox. 1000 feet).
> > As to the shaft seal, as the pressure increases the friction between the
> > seal and the rotating shaft increases.  Once the seal wears a little it
> > will start to leak.  After enough water gets into the motor, the motor
> > will start to corrode and eventually short out.
> >
> > Roger
>
> On Sgt.Peppers I have as maindrive a Minn Kota - air pressure compensate
> with a normal Scuba regulator. Ken M. can explain better than I - in
> your
> language - how its works. One dive day two years ago the connection
> between
> the pressure bottle and the regulator was missconected.
> Lost the air. Motor was filled with lake water (freshwater) - I realise
> during the dive that it turns slow - no flash or short securit - still
> works - I am pretty shure you lost 20-25 %& efficentcy with a oil filled
> thruster. I dry it later and it still works up today ..
>
> The first version of the main drive was a car engine starter - oil
> filled - but was filled
> with car motoroil - and did'nt start after longer stop periods - later I
> filled the engine with a oil (Terpentin) very simillar to petrol - the
> engine runs well - but the cables plastic gets hard and break.. Last
> version was air compensation for all thruster and batterys - works well
> - but keep care that the pressure bottle is well connected..
>
> Update for friends : Freya is destroyed by lorry accident - very sad but
> maybe can repair,
> sail goes 3-4 inch into the pressure hull during the accident. Just the
> midship section has
> to be replace..
> CSSX interior stainless steel frame work on walls and decks structure of
> diver chamber and control room are done.. Get pretty hot inside the hull
> if the sun is shinning..
> So hot that you can not grab the frames on the top inside the hull !
> Stop working and waiting
> for bad weahter and rain ..
>
> Solutions are one thing - - - expirence an other.
>
> Best regards Carsten, Germany