Joe, Okay, if you insist. The mechanical thru-hull was a ball and socket in
the Nektons, tested for 1000 & 1100--although they got a pretty severe case
of arthritis beyond 500 or 600, according to those who knew. Vance
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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