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Re: [PSUBS-MAILIST] Inner / Outer support ribs.



Carsten,

Thank you for that. Thanks to you and Dan, I have made up my mind to put the ribs on the inside of the hull. Is it required to put ribs in the tower or is the fact that it is smaller make it stronger and so it doesn't need them ? I do not remember seeing any ribs in conning towers of any subs I have seen.

Myles.
----- Original Message ----- From: "Carsten Standfuss" <Merlinsub@t-online.de>
To: <personal_submersibles@psubs.org>
Sent: Thursday, November 10, 2005 11:34 AM
Subject: Re: [PSUBS-MAILIST] Inner / Outer support ribs.


Outside ribs :

Pro - more space inside

contra - no streamline outside anymore
contra - corossion outside, special if doublehull concept
contra - welds on pull, needs good and full welds instead of
inside             welds under pressure have just to huld the frame in
place..
contra - to build a round hull is more tricky

Useful places example scetch :

http://www.prismnet.com/~moki/20050111.115907/OptimizedXcylinderXpressureXhullX001.jpg

regards Carsten


Myles Hall schrieb:

I understand that support ribs offer the same strength increase
whether they are on the inside or outside of the pressure hull.  As I
am planning on adding fairing, I am also considering puting the ribs
on the outside to free up interior space.  Is this a good idea ?  In
other words, is it easier to install the ribs when they are on the
outside ?  Are the ribs pre-made and then welded on or built right
onto the pressure hull ?  I can't seem to figure out the ribs, how
they are made, and the best way to install them.  My pressure hull is
of a similar design as the K350 36" x 1/4 " x 8'.  I am considering a
rib spacing of 18".

Myles.




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603-529-1100
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