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Re: [PSUBS-MAILIST] concrete submarine yacht - building cost

Frank,
Even though I'm eliminating (two) rotating shafts by using fixed verticals, in lieu of the standard K-350 set up. I will be retaining one rotating thru-hull for the steering linkage, and another for the distress buoy release.
You would be correct in worrying about such penetrations for something permanently docked but,what makes me feel better about this, is that Nekton (I believe) uses rotating penetrations down to 2 K.
Vance may correct me on this but, I seem to remember reading that one of the boats uses a manual manipulator through a standard gland nut packing arrangement down to 2000'. 

This makes me feel a whole lot better about these at my dinky depths.

Joe




From: ShellyDalg@aol.com
Reply-To: personal_submersibles@psubs.org
To: personal_submersibles@psubs.org
Subject: Re: [PSUBS-MAILIST] concrete submarine yacht - building cost
Date: Tue, 13 Feb 2007 23:05:42 EST

I'm not an expert plumber, but if a shaft seal fails while your sub is
docked, stored, or just parked at the dock....It sinks.
I know the efficiency of a hydraulic system is somewhat less than a direct
drive, but a hydraulic through-hull fitting, with exterior hydraulic thrusters ( available as off the shelf ) has a long history of reliability, is easy to 
maintain, and also easy to monitor/fix.
And then we can consider the magnetic couplers available on hazardous
pumping installations.
There is virtually no leaks, no loss of power from conversion from
electrical to mechanical to hydraulic to mechanical, and really no maintenance of the 
coupler.
Here in California, there is a pumping station supplying millions of gallons 
of water into the California aqueduct and it's been upgraded with  magnetic
couplers.
The horsepower is very large, and the maintenance is quite low.
Sorry for interrupting on this thread, but I just don't like the idea of a
spinning shaft under 200 feet of water.
There's got to be a better way.......Frank D.






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