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Need Formula for Determining Ballast Chamber Size

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Need Formula for Determining Ballast Chamber Size

Postby Davinci » Sun Jul 12, 2009 4:00 pm

Deleted due to Attitude of replies.
Last edited by Davinci on Sun Jul 12, 2009 8:43 pm, edited 5 times in total.
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Postby Sub culture » Sun Jul 12, 2009 5:38 pm

No.
'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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Postby kazzer » Sun Jul 12, 2009 6:16 pm

.....................
Last edited by kazzer on Wed Jul 15, 2009 1:57 pm, edited 1 time in total.
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Postby kazzer » Sun Jul 12, 2009 7:22 pm

'''''''''''''''''''''''
Last edited by kazzer on Wed Jul 15, 2009 1:58 pm, edited 1 time in total.
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Postby Davinci » Sun Jul 12, 2009 8:15 pm

kazzer wrote:Did someone ask if there was a formula for working out ballast tanks sizes, or did I dream that?

You build and install everything but the ballast tank. You leave space in the hull for the eventual ballast tank. You trim the boat for submerged trim with an empty space that will later receive the ballast tank. You place a hunk of foam into the space, sized to get the boat to designed surface trim. Take out the foam and build a ballast tank with the same displacement. Done.
The above is the Dave Copeland method.


Okay, Thanks for the Info.
I've always liked pratical applications more than formulas.
So why didn't you say that in the first reply.
Last edited by Davinci on Tue Jul 14, 2009 12:51 pm, edited 1 time in total.
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Postby kazzer » Sun Jul 12, 2009 8:27 pm

.................
Last edited by kazzer on Tue Jul 14, 2009 10:16 am, edited 2 times in total.
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Postby Davinci » Sun Jul 12, 2009 9:35 pm

Did you try Ships-N-Things?
I know thay have a lot of Robbe hardware.

http://www.shipsnthings.com/HTML/robbe.htm
Last edited by Davinci on Mon Jul 13, 2009 1:23 pm, edited 1 time in total.
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Postby Sub culture » Mon Jul 13, 2009 11:15 am

There are three places in Germany that sell the bayonet rigs. They're not made by Robbe,but by a third party outfit.

The only way you're likely to purchase one in the States is if someone flogs one on ebay S/H (rare).

Apart from Engel, you can get the rings from Piranha Modellbau and Norbert Brueggen.
'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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Postby hakkikt » Mon Jul 13, 2009 7:08 pm

It is "mail@modelluboot.de". Just hover the mouse over the link and the address will appear in the status bar.
From what I hear, you will need some patience, he is sort of known for not answering e-mails too often. Seems like calling him on the phone works best :)
- mobilis in mobili -
SC#1604
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Postby Davinci » Wed Jul 15, 2009 1:50 pm

I found a good 'Rule of Thumb' on the ballast chamber weight and size, that hopefully I can remember.

* 1 pound of water equals about 28 cubic-inches of space *

So, you can get the model to proper levels (submerged and surfaced) with lead weights. Subtract one from the other, then convert that to cubic inches and you have the size if chamber needed.
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Postby Davinci » Wed Jul 15, 2009 2:38 pm

Here's a good website for calculating the volume of a cylinder:
(You can fill in any 3 of the numbers and it will give you the 4th)

http://grapevine.abe.msstate.edu/~fto/t ... inder.html
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Postby Sub culture » Thu Jul 16, 2009 5:12 am

An even easier rule of thumb is to switch to metric (a far more elegant and logical system of measurement), where one litre of water= one kilogram of weight.
'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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Postby Davinci » Thu Jul 16, 2009 10:45 am

............No.............
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