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Building a WTC: - One way to do it..

Post your favorite modeling 'tips' and 'tricks'

Postby Robse » Wed Aug 13, 2003 1:26 pm

I'd like to share with you guys how to build a watertight compartment. The solution you'll see, has tested tight at 2.5 bar (Both compartment and internal hose system), that's the pressure at 82 ft.
Surf to http://hjem.get2net.dk/robse/pages/SSBN/SSBN.htm , and look under "My Results", "WTC1" and "WTC2"

A little "teaser":
Image




Edited By Robse on 1078619243
Yours Sincerely, Robert Holsting, Denmark
1/81 SSBN Ohio Class scratch builder, more at www.robse.dk

"Never be afraid to try something new; remember that it was amateurs who build Noah's Ark, and professionals who build the Titanic"
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Postby raalst » Sat Aug 16, 2003 3:58 pm

Thank you for detailing the construction in your website.
Very educational !

As an observation from partially looking through
the rest of the site,
I saw you use a mechanical device to level the ship.
Did you put in some PD (proportional-differential)
circuit ? otherwise you risk that the boat in
correcting the previous error, creates the next one.
(this is called overshoot, and leads to the boat
never getting level but porpoising)
Given you technical expertise, I assume you have
given this a thought.

Regards,
Ronald
Regards,

Ronald van Aalst

--------------------------------------------
Just here to Learn
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Postby Robse » Sat Aug 16, 2003 7:25 pm

Hi Ralst

EXELENT point!!! ...and you're right: I have cought this problem on the drawing board a while back. The system has a delay of about 7 sec's to avoid it fighting it self, or waves for that matter..
I'm impressed that you cought this problem at first glimse... it took me a week to think of that one... wow. :)
Yours Sincerely, Robert Holsting, Denmark
1/81 SSBN Ohio Class scratch builder, more at www.robse.dk

"Never be afraid to try something new; remember that it was amateurs who build Noah's Ark, and professionals who build the Titanic"
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Postby duke » Thu Sep 18, 2003 1:37 pm

Hi Guys,

I am building my first WTC from scratch. I have the 3" plexiglas tube cut and the end-caps made. Next step is to make the tray for the interior electronics, servos, motor, gearbox, etc. I have noticed that some folks place their gear box on the wet side of the WTC end-cap. This would save space of course. I am planning to build mine inside. But here is my real question: Do most of you place the main battery in the wet space?? I know gel-cells are ok for this. What about the 6-cell 7.2volt ni cd battery packs?? Will they perform ok in the wet space?

Many Thanks for any comments

Harold Rouchell
aka duke
New Orleans, LA :laugh:
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Postby Sub culture » Thu Sep 18, 2003 2:20 pm

I wouldn't use Nicads in a wet space. Either make room for them in your main cylinder, or build an extra WTC especially for the batteries.

Andy
'Why are you staring at an empty pond?'

Want to dive your boat in crystal clear water? Then you had better Dive-in- http://www.diveintomodelsubmarines.co.uk
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