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Date: Thu, 7 Sep 2006 20:47:58 -0600
From: Bob White <rlwhite@comcast.net>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
Subject: Re: [FlyRotary] Re: Exhaust System - Comments?
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Hi Steve,

I would be interested in what your costs are when you get it finished.
I have a tangential muffler with cool tube, similar to several that
have broke, so I may be looking for an alternative.  I already don't
like the high heat levels under the cowl. :(  Your layout appears to be
quite close to what I would need, possibly with the down tube moved a
little forward.  If I used something like that, I think I would start
with a run of straight pipe a few feet down the fuselage and see how
bad the noise was.  I like Buly's suggestion also.  Seems like it would
be a little extra insurance against cracking and it would make engine
removal a little easier.

Do you have the Mistral gear reduction also?  They seem to have done a
great job on the design.

Bob W.  (DAR sometime this month, I think!)

On Thu, 7 Sep 2006 22:02:49 -0400
Bulent Aliev <atlasyts@bellsouth.net> wrote:

> Steve, one thing I would do is have short stubs welded to the flange  
> and than the bends slipped on top with slip joints.
> The rest of it looks good. Have tabs on each side of the slip joints  
> for springs to pull the two parts together at all times, but allow  
> for some movement if the pipes expand or twist.
> Bulent "Buly" Aliev
> FXE Ft lauderdale, FL
> http://tinyurl.com/s5xw8
> 
> On Sep 7, 2006, at 8:28 PM, Steve Thomas wrote:
> 
> > I have been lurking on this list for some time, really enjoying and  
> > learning from all of your experiences.  I'm the guy who has  
> > Mistral's serial number 001, two rotor normally aspirated engine.
> >
> > I just finished tacking this exhaust system together and thought  
> > that I'd ask for comments.  The current material is mild steel, but  
> > my plan is to take it to Burns Stainless (just down the road from  
> > me) and have them duplicate it in 16 ga.  321 stainless.  The  
> > collector is from Burns, as is the muffler.  If you can see the  
> > tacks, you'll be able to see why I'm taking it elsewhere.  ;-)  The  
> > header pipes are 2" and the combined pipe after the collector is 2  
> > 1/2".  This was recommended by Burns.
> >
> > After fabrication, I plan to have it coated with HPC HyperCoat  
> > Extreme as my design goal was to get the heat out as quickly and  
> > directly as possible and keep as much in the pipes as possible  
> > until it exits to atmosphere.
> >
> > The oddball bends in the header were designed to keep the header  
> > pipes the same length, which they are.  Given all the difficulty  
> > some have had with their exhaust systems, I'd thought that I'd  
> > throw it out there for comments.
> >
> > Best Regards,
> >
> > Steve Thomas
> > SteveT.Net
> >
> > ______________________________________________________________________ 
> > __
> > <DSCN0168.jpg>
> >
> > DSCN0168.JPG
> >
> >
> > --
> > Homepage:  http://www.flyrotary.com/
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> 
> 
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