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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