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From: "george lendich" <lendich@optusnet.com.au>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
References: <list-1333196@logan.com>
Subject: Re: [FlyRotary] Re: New NA exhaust finished
Date: Wed, 16 Aug 2006 17:12:42 +1000
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> On Aug 15, 2006, at 7:51 PM, Charlie England wrote:
> 
> > Bulent Aliev wrote:
> >
> >> After almost 3 weeks, my new 2 pipe straight out exhaust is  
> >> finished.  It is made of 2"  321 stainless tubing. At the end they  
> >> converge into  one short 4" oval tube. The fancy bends are to make  
> >> the inside length  the same for each tube. The flange is Racing  
> >> Beat mild steel. Each  tube has one EGT sensor about 3" away from  
> >> the exhaust port. The O2  sensor is on only one of the tubes due  
> >> to lack of room.. My biggest  concern was the noise that it was  
> >> going to make. I was pleasantly  surprised when I started it in  
> >> the hangar (John Slade told me it is  OK to do it :). The noise  
> >> was almost the same as with the turbo  housing on. Saved 30 pounds  
> >> of weight on the engine and maybe 10  pounds less of ballast on  
> >> the nose. Did not have time to run the  engine at full tilt, since  
> >> I'm in the process of making stainless  steel heat shields.
> >> Bulent "Buly" Aliev
> >> FXE Ft lauderdale, FL
> >> http://tinyurl.com/s5xw8
> >
> >
> > It sure looks nice, but is there any reason for the oval collector?  
> > Haven't quite a few others had fatigue failure 'issues' with non- 
> > round outlets?
> >
> >
> >
> 
> That crossed my mind too Charlie, but we'll see? The shop that made  
> it it is across the street :)
> Buly

Buly,
It isn't the shape but the weld ( that joins the two pipes) that fails.
George (down under)