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

[atozed@juno.com]

The tow vehicle can't steer the trailer, going backwards, with straps. 
Being able to push, steer, and brake the trailer would help.
-PK

On Wed, 17 Nov 2004 20:31:45 -0800 "Steven Mills"
<invacuo@applevalley.net> writes:
> 
> 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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