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From: "Ed Anderson" <eanderson@carolina.rr.com>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
References: <list-1333172@logan.com>
Subject: Re: [FlyRotary] Re: New NA exhaust finished
Date: Tue, 15 Aug 2006 20:24:11 -0400
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----- Original Message ----- 
From: "Charlie England" <ceengland@bellsouth.net>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
Sent: Tuesday, August 15, 2006 7:51 PM
Subject: [FlyRotary] Re: New NA exhaust finished


> 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?
>
>
> Charlie, I don't think that will be a problem in this case.  Seeing as how 
> the oval is not enclosed, the gases would probably not exert much force 
> perpendicular to the walls.  Now if it were a closed tank, I agree that 
> flexing of the flatter sides would like lead to fatigue and failure.  But, 
> don't see that being problem - unless Buly closes it up to make it even 
> quieter {:>)

Ed