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

[MerlinSub@t-online.de (Carsten Standfuß)]

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