[PSUBS-MAILIST] many questions from a rookie

[Alan James via Personal_Submersibles]

Hi Havard,a couple of years ago I looked at ZW cad & it was economical but didn't have an FEA option.It might have changed since.You could export the file to another program (can't remember it's name) but this program wasvery expensive.I bought Rhino 5 & two plug ins, "Orca" (marine design) & scan & solve, which is a basic FEAprogram. I am doubtful of the accuracy of scan & solve as I questioned one of their experts& he was very evasive on how accurate the program was. It is generally thought best to leave FEA up to the experts.Emile touched on your question about pressure build up. Oxygen is fed in at the same rate asyou consume it & is breathed out in identical volume as CO2. The CO2 is removed in the CO2scrubber.Alan

      From: Håvard Hardy via Personal_Submersibles <personal_submersibles at psubs.org>
 To: Personal Submersibles General Discussion <Personal_Submersibles at psubs.org> 
 Sent: Tuesday, February 24, 2015 9:18 AM
 Subject: [PSUBS-MAILIST] many questions from a rookie
   
i allways wantet to build a sub, but still got allot of research to do.. there is a few things i could not find the answer in the internet, so have to ask here.
i was thinking of building a small 1 man sub. i used the psub 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.
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?..
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?
does somone sell the through hulls to get wires thru the pressure hull? or do i have to make on my own?
if the pressure hull have a operation deapth off 500 feet, how do i find out how thick the Viewports have to be..
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.
probably have many other things coming :)
Håvard.
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