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Re: [PSUBS-MAILIST] Gathering  Material to build mini sub
    As said previously in carl's message 
the subject of using an epty or even a new propane tank for use as the hull of a 
sub has been thouroughly discussed here before, and the general concensus is 
that it would be better to build your own.  If you check the archives on 
the website I am sure you will see the oodles of messages pertaining to 
this.
    The reasons for this philosophy are 
numerous but I'll touch on some of the biggies.
    First off, it can be bery difficult to 
know anything about the metalurgy of  the tank this is very important 
because if it is a brittle metal it could cause some problems when put under 
pressure.  Second, even though it seems you have the perfect shape all 
ready to go, if you plan on inserting reinforcement ribbing as you have stated 
that yoiu do, you still Have to cut the whole thing open in order to slide it in 
the end, and then you have to weld it back on.
    If you are planning on using an old 
tank then your problems become even larger, first is the smell, withought a 
thourough sandblasting of the entire interior of the tank, the smell is permant 
and unbearable.  Also with an old tank, determining the metalurgy can be 
next to impossible.
    Lastly is cost.  It is probably 
true that you could save a few bucks by going with a tank, but the difference is 
not so terribly significant to make it worth the while. You can easily buy a 
cylinder and two endcaps at whatever thickness you want with whatever sort of 
steel you might desire.  When you do it this wayyou know everything about 
your sub and are put in control of more variables that relate to your 
safety.
    It is possible to build a sub from a 
propane tank, and what still I believe it has been done before.  Doing this 
though is more of a novel thing and can be a risky and displeasureful 
adventure.  It is true that you for the use of wich you intend your sub for 
could probably use a propane tank as a sub hull, but it is a slightly risky 
venture and can be somewhat more troublesome that building your own hull.  
I would strongly recomend reading some of the archives on this subject matter as 
I am sure that unless you have your heart set on using a propane tank that you 
will be quickly converted.
 
Brett Pinkepank
  
  Thank you Carl for responding ,if i was to use a propane tank as the hull 
  for a shallow sub , that was reinforced with ribbing,what kind of max depth 
  are we looking at. And why is this tank such a bad idea? This mini sub would 
  be inland water sub and would never see deep depths. I do appericate your 
  thoughts and ideas ,thank you.    
  Kurt      Frederic,Wisconsin
   
  
    ----- Original Message -----
    From: 
    Coalbunny
    Sent: zaterdag 20 april 2002 6:56
    To: 
    personal_submersibles@psubs.org
    Subject: Re: [PSUBS-MAILIST] Gathering 
    Material to build mini sub
     
LOL!  Welcome to the group!  Forget it!  Not 
    worth the trouble.  We've
discussed this many times in here.  
    Please do not be offended as most
(if not all) of us have had the same 
    thoughts.
Carl
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