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Re: [PSUBS-MAILIST] Re: Variable Ballast Calculations, Bill



Hi Paul.
 
You wrote..."Well that's the rub, isn't it?  My feeling is that many engineering types would be comfortable designing something for themselves to use but would be pretty hesitant to give someone else recommendations on pressure vessel details.  Is that right?"
 
Perhaps some people might be Paul, but I have seen a lot of recommendations given for a lot of different things here. Many things that were critical also. Everyone here at psubs understands that it is their own responsibility to make sure anything they build is safe
 
regardless of whether other people's recomendations are correct or not.
 
Bill.
 
 
----- Original Message -----
Sent: Wednesday, November 16, 2005 12:14 PM
Subject: Re: [PSUBS-MAILIST] Re: Variable Ballast Calculations, Bill

On 11/15/05, Akins <lakins1@tampabay.rr.com> wrote:

... So imagine yourself at only 2 atm or 33 ft of pressure on your body, but actually diving to 99 feet and staying for a maximum of 205
minutes without any deco! Wouldn't we scuba divers love it if we could do that! A hybrid like this would allow us to. I would say it would be worth the extra trouble. What do you think Paul?

I'm with you Bill, sign me up for a pressure-limited cabin!  But I am starting to wonder why not just limit it to 1atm. :-)  Once I start thinking about building a crew compartment that handles 3atm and maybe 1atm of overpressure, well it seems like why not just build a traditional 1atm boat?  But this hybrid sub design is fascinating and I'd like to see it sketched out. 
 

Now I would like to know what hull strength I would need for a 1 atm pressure vessel to withstand 2 atm of outside water pressure. Probably have to build it with a safety factor for 3 or so atm
just to make sure it was safe. I wonder what steel thickness I would need or if a 1/2 inch thick kevlar wing tank would withstand 2 or 3 atm with 1 atm inside it? Any help here fellas?

Well that's the rub, isn't it?  My feeling is that many engineering types would be comfortable designing something for themselves to use but would be pretty hesitant to give someone else recommendations on pressure vessel details.  Is that right?  Sorry I haven't been on this mailling list long enough to know what's been done and discussed in the past and I didn't find anything on PSUBS.org or by searching it with Google.