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From: "Tracy crook" <lors01@msn.com>
To: flyrotary@lancaironline.net
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Subject: RE: [FlyRotary] Re: PP construction methods
Date: Thu, 21 Jun 2007 09:31:05 -0400
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I don't intend to build a PP engine anytime soon but FWIW,  I think the best 
possible material for bonding and sealing the insert is Proseal (Polysulfide 
stuff used to seal fuel tanks).   It is amazing stuff and I use it whenever 
it absolutely, positively has to seal and bond the first time.  Not cheap 
and it has a short shelf life but worth it when failure could mean the loss 
of a $400 rousing (or worse).  Use an appropriate viscosity (it is made in 
various ones) and it's my guess that welding, O-rings, epoxy, etc would be 
unnecessary.

Tracy

What is Wildblue?    Wildblue is my satelite internet provider that freed me 
from dial-up hell where DSL is not available.

>
>George,
>     Let me get this straight.........Steel tube TIG welded to steel 
>insert.......Then aluminum
>insert with O-ring (s) to seal to the steel tube.......? A sketch would be 
>worth a thousand
>words for the engineering challenged........
>--
>Kelly Troyer
>"Dyke Delta"_13B ROTARY Engine
>"RWS"_RD1C/EC2/EM2
>"Mistral"_Backplate/Oil Manifold
>
>
>
>
>
>
>-------------- Original message from "George Lendich" 
><lendich@optusnet.com.au>: --------------
>
>
>Rusty,
>I Heard similar stories, but am sure Lynn is correct in that, if their done 
>correctly their OK. The one's I seen weren't so good.
>The new method of welding to the steel liner, eliminates any possible leak. 
>I originally suggested welding to the inner and outer aluminium, but 
>someone suggested that wasn't feasible, as it was too difficult to get 
>access to.
>So Tig welding to the steel liner is good but you have to use a steel tube 
>- which you can't weld externally. So I came up with a method of Tig 
>welding a aluminium tube and flange to the exterior, which has an O ring 
>seal to the steel tube, and passed it by Bill J. who felt it was a good 
>idea. Probably could use a couple of O rings if you felt like it. The 
>advantage of this is that the O ring will allow for differing expansion and 
>contraction rates which might put stress on the inner tig welding. Am 
>elegant solution IMHO.
>On the side ports, your suggestion would be OK.
>Of course the factory PP were integral to the injection casting.
>George ( down under)
>
>
>Greetings,
>
>One of the things that's always bothered me about making a PP housing is 
>leakage.  I've heard very experienced folks say that eventually, any PP 
>housing you make will leak, and it's easy for me to imagine that happening. 
>  I don't think I've heard the same thing about factory housings though.  
>How are the ports installed in the factory PP housing?
>
>The other problem with a conversion is the side ports.  I know people fill 
>these with their favorite epoxy, but I'd worry about that coming loose, and 
>getting into the rotor.  How much would it hurt the PP operation if you 
>just sealed the ports on the outside of the side housings with a plate 
>where the intake would have been?
>
>Cheers,
>Rusty