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

["Øystein Skarholm" <skarholm@gmail.com>]

The idea of hydraulic thruster is also of course under consideration.
Right now I am trying to find out what would be the best solution when
thinking of money / safety / maintenance / reliability. By the way I
think that for initial discussions like this, the more people the
merrier.





On 2/14/07, ShellyDalg@aol.com <ShellyDalg@aol.com> wrote:
> 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.


--
Best Regards
Øystein Skarholm
www.ubat.no




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