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Re: [PSUBS-MAILIST] Soft Tanks

Emile,
I would definitely like to see some detail on that. How is the build going?
Vance


-----Original Message-----
From: Emile van Essen <emile@airesearch.nl>
To: personal_submersibles@psubs.org
Sent: Sat, 27 Dec 2008 4:23 pm
Subject: RE: [PSUBS-MAILIST] Soft Tanks

Jim,
 
3% is a nice figure for the VBT. The Kreidesee project has 3,5 % or 90 Litres. Enough to compensate 1 passenger.
 
When the sub is in trim on dive #1 It is practical to keep the water in the VBT. You will be quick in trim for dive #2.
 
Emile
 
Van: owner-personal_submersibles@psubs.org [mailto:owner-personal_submersibles@psubs.org] Namens Jim Kocourek
Verzonden: zaterdag 27 december 2008 23:09
Aan: personal_submersibles@psubs.org
Onderwerp: Re: [PSUBS-MAILIST] Soft Tanks
 
Hi Emile,
 
Thanks for the info. I will also have hard tanks that will be good for about an additional 3%.
 
I will look at it again.
 
Thanks Again,
Best Regards,
 
Jim K
 
----- Original Message -----
From: Emile van Essen
To: personal_submersibles@psubs.org
Sent: Saturday, December 27, 2008 3:42 PM
Subject: RE: [PSUBS-MAILIST] Soft Tanks
 
Hi Jim,
 
Nice project pictures!
 
I think 12 % is a bit low. Modern military subs has this figure.
20-25 % is a better figure.
 
U-boat worx C-quester has about 100% to achieve freeboard. But the extra weight is a nuisance when accelerating and turning
 
Groet, Emile
 
Van: owner-personal_submersibles@psubs.org [mailto:owner-personal_submersibles@psubs.org] Namens Jim Kocourek
Verzonden: zaterdag 27 december 2008 21:44
Aan: personal_submersibles@psubs.org
Onderwerp: [PSUBS-MAILIST] Soft Tanks
 
Hi All Psubbers,
 
I have completed preliminary design of my soft tanks and am looking for input. They will be shoulder tanks tapered from the sides and ends at 2-3 degrees to minimize the chance of bubble entrapment. As they are now the will support about 12 % of my subs total weight.
 
The bottoms will be mostly closed with rows of 4 inch diameter holes to minimize burping in rough water.
 
Does anyone have a guideline on this area as to what percentage is good etc.
 
Best Regards,
 
Jim K
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