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Re: [PSUBS-MAILIST] Testing "Persistence"
Thanks Pierre,
No, no D-day connection at all. I would have launched this past Sunday but
the place I'm launching from is really busy on the Memorial Day holiday.
Here in the USA Memorial Day is this weekend. It's better next week anyway
because it will give me more time to tune the props.
I reworked all three props and am planning to test in water again tomorrow.
I reduced the blade area, reduced the pitch and rebalanced them. It's only
a guess if I have them right but testing will soon tell.
Dan H.
----- Original Message -----
From: "Pierre Poulin" <pipo305@hotmail.com>
To: <personal_submersibles@psubs.org>
Sent: Monday, May 31, 2004 2:18 PM
Subject: RE: [PSUBS-MAILIST] Testing "Persistence"
> WOU HOU!!! Congrats Dan! You must be an happy guy!
> Good work!
>
> June 6th? Any D-Day connection?
>
> Pierre "historian" Poulin
>
>
>
> >From: "Dan H." <jmachine@adelphia.net>
> >Reply-To: personal_submersibles@psubs.org
> >To: <personal_submersibles@psubs.org>
> >Subject: [PSUBS-MAILIST] Testing "Persistence"
> >Date: Fri, 28 May 2004 08:41:27 -0400
> >
> >All in all, the test on KH- 350 "Persistence" went well. As planned,
we
> >didn't launch, but tested while still tethered to the trailer. It
floated
> >off the deck a few inches but couldn't go anywhere.
> >
> >We have the trailer workings and getting it in the water smooth. It
takes
> >a bit of time to unhook, add in the extension rod and then rehook, but
not
> >bad. After that, it's not much different from launching any other boat.
> >It was a little strange standing up with my head out of the conning tower
> >while the sub pitched and rolling around me. Strange because for three
> >years I've been in and out of it while it was sitting on the shop floor
and
> >it didn't move a bit.
> >
> >We put it in very slowly, watching all around as we proceeded. The first
> >problem we encountered was air leaking from every bolt that passed
through
> >the forward and rear Main Ballast Tanks. I have a bumper / hand rail
> >running around the sides of it and never gave a thought to sealing around
> >each bolt that passed through. I also had a few bubbles coming from the
> >seal where the forward MBT mates to the hull. All this can be fixed with
a
> >few dabs of silicone. Those were the only leaks. As far as I could tell
> >in the hour it was in the water, there were no water leaks. It has been
so
> >long since I put in some of the thruhulls that I wasn't positive I did
the
> >final assembly with the O-rings in place on all of them. Guess I did!
> >
> >The main reason for the wet test was to run the thrusters in water. When
I
> >was purchasing the props, the prop supplier told me that they are a bit
> >over sized but they are the nearest they have to fit my needs. The only
> >way to know how well they matched was to test in water and monitor the
> >amperage draw of the motors. I barrowed a heavy amp meter used to check
> >automobile starting systems and had it in the sub while testing. They
were
> >right! My side thrusters are supposed to draw 20 amps and they drew 30.
> >My rear thruster is suppose to draw 70 amps and it drew 110.
> >
> >In the process of testing the rear thruster I smoked two power
transistors
> >on the motor controller but just happen to have two good ones from the
> >last controller I smoked while I unknowingly reversed the polarity.
Never
> >throw away junk!
> >
> >I played around with the sonar / fish finder and the air system and all
> >worked well there.
> >
> >All in all the test was good. The thruster results were expected and now
I
> >will build a jig to reduce the pitch on the props and also mill them down
a
> >little. After that I will borrow the amp meter and retest to see how
close
> >I come to the proper current draw.
> >
> >Still on for a launch on June 6th.
> >
> >Dan H.
>
> _________________________________________________________________
> MSN Search, le moteur de recherche qui pense comme vous !
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>
>
>
>
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