Re: [PSUBS-MAILIST] Korwin's first float

["Steven Mills" <invacuo@applevalley.net>]

That was a good report !

For a test launch of this kind, would a
rope and winch on trailer or vehicle tethered
to sub have been of any help?

--Steve

On Wed, 17 Nov 2004 19:22:23 -0800, <atozed@juno.com> wrote:

> Launch: backing down the ramp with two straps giving about 10' between
> the truck and sub trailer. The sub floated off easily because about
> 1300lbs of lead weight needed to submerge was not on it. When launching
> to dive, the straps will have to be longer.
>
> Maneuvering: the boat being light, the bow thruster was above the
> waterline and unusable. The steerable main prop worked fine to reverse
> away from the trailer and motor away. After a few minutes, testing the
> front floodlights (short circuit pun) resulted in a loss of all power,
> dead in the water. Being close enough to the dock to throw a rope, there
> was no risk of needing to swim. A look at the batteries revealed a broken
> terminal.
> Probably it had been cracked and was then overheated. A prop in the water
> takes a lot more power than one in the air, see lesson 1. A quick wiring
> change from 24/36 volts to 12 volts gave the sub a "limp home mode".
>
> Recovery: much easier than anticipated. With the sub unmanned, three
> people on the dock pulled it onto the trailer. The trailer did come up
> the ramp a little as the sub was being pulled on, a remote controlled
> parking brake would be good. Perhaps it could be on a  (steerable?) 5th
> tire near the hitch coupler.
>
> Lessons: 1. Testing in the workshop is not the same as in the water. 2.
> Ability to reconfigure is at least as important as redundancy.
>
> Thanks to all at psubs, especially Gary Boucher for his Convention
> presentation, for helping me get this far. Now I expect I'll be diving
> more and working less.
>
>
>
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--




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