Re: [PSUBS-MAILIST] Rebar/Fiberglass Hull- 1 ATM design

[Coalbunny <coalbunny@onewest.net>]

NOT good Ryan.  You see, rebar is not good when it comes to strength. 
It's great for pouring concrete and setting forms, it then provides a
non-permiable ribbing to keep the concrete from separating when
cracked.  It's strength is in the linear sense.  Not good for anything
structural like a sub frame.  Maybe, if it was unmanned.  But I doubt
you're gonna do that, right?

Square tubing would be best for a secondary frame (would have to sketch
out what I'm talking about for you to really understand that thought,
I'm sure).  For bulkheads, I'd say use thick sheet steel.  Of course I
ain't the engineerin' type.  Just thinking of what I've seen in books
and such.
Carl


Rf3500psi@aol.com wrote:
> 
> I had an idea for a hull that I wanted to run by you guys and get an
> opinion-good, bad, or indifferent.
> 
> The hull is frame based.  The frame is made of 5/8" rebar, bent and
> welded into circular rings, spaced 1' apart along the length of the
> keel.  For the nose cone, rebar lengths would be bent into oval or
> parabola shaped sections and then crosed and welded.  The tail would
> go the same way, shaping sections of rebar and welding.  Then, the
> frame would be covered in a thin, flexible plywood.  We are also
> considering a sheet metal layer on top of this.  Finally, the hull
> would be coated with fiberglass.
> Penetrations would be sealed with o-rings and a sealant.
> 
> So,what do you think?
> 
> Thanks,
> Ryan
> 
> P.S. What do you guys think of a spray on bedliner layer somewhere
> in/on the hull?  Just some half-baked idea my colleague had; figured I
> should ask.

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