[PSUBS-MAILIST] MBT's

[James Frankland via Personal_Submersibles]

Hi Rick,

I didn't actually make my tanks, I got a boatbuilding company to make
them.  However, I did do the shape.  My tank shapes are 1/4 of an
ellipse.  I drew out the shape on paper using geometry.  There are
various methods for doing an ellipse.  Then I transferred it to a
wooden template that then formed the shape.  See here.
http://www.guernseysubmarine.com/Extended_files/Page10114.htm

However, I have some suggestions that I would do different.

1.  I would make the ellipse a little steeper.  ie more of an acute
angle.  I can get stuck nose or tail up if I do not vent the tanks
evenly.

2.  Fully enclosed tanks all round would be better.  Or as near to it
as you can.  If you have the standard 15" forward port, you should be
able to enclose most of the forward tank.  Mine are reasonably
enclosed and still spill in rough conditions.

3.  Consider saddle tanks as an alternative.  Or a combination of both.

Im sure ive said this lot before!

Kind Regards
James


On 28 November 2017 at 21:41, Rick Patton via Personal_Submersibles
<personal_submersibles at psubs.org> wrote:
> This is mainly directed to those who have built a K-350. I am thinking about
> making my main ballast tanks and notice from pictures of others that the
> front is a different shape than the back and was wondering how you came up
> with the specific shapes as there are NO offsets on the plans.
> Rick
>
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