[PSUBS-MAILIST] many questions from a rookie

Mon Feb 23 15:57:35 EST 2015

Håvard, 

Some quick awnsers..

i was thinking of building a small 1 man sub. i used the psub
<http://www.psubs.org/design/unstiffcyl> Unstiffened Cylinder Calculator to
check how thick the hull hadd to be, to get to 200 meters, the hull have to
be over 15mm thick.. so thought maybe i should use ribbs to get it thinner,
but dont know how to calculate whit ribs, and how to find out how many ribs
i need, and spacing betwen them.

> Hull dia??  

a few other tecnical things i dont know.

How to you keep the pressure not to rise in the pressure hull? you need
oxygen, so the pressure will rise?..

>>You consume / burn  the oxygen. No pressure rise

and how do you get the propeler shaft thru the hull, and not get water in
the sub. easy on a boat where the pressure is not so big, but att 500 feet?

>> ceramic / mechanical seal like in pumps

does somone sell the through hulls to get wires thru the pressure hull? or
do i have to make on my own?

>> Subconn and similar company’s sell them. You can also use high pressure
cable glands  (up to 400 M) Or make your own with brass and Epoxy.

if the pressure hull have a operation deapth off 500 feet, how do i find out
how thick the Viewports have to be..

See table: You only have to translate a few German words.

and does anyone no of a good drawing program to draw the sub? have only made
it on paper.. need to make on the computer and get a FEA.

If you want it legal: ZWcad is a cheap but good Autocad clone

Regards, Emile

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