X-Virus-Scanned: clean according to Sophos on Logan.com X-SpamCatcher-Score: 10 [X] Return-Path: Received: from ms-smtp-05.texas.rr.com ([24.93.47.44] verified) by logan.com (CommuniGate Pro SMTP 5.1.6) with ESMTP id 1854666 for flyrotary@lancaironline.net; Wed, 21 Feb 2007 23:30:51 -0500 Received-SPF: pass receiver=logan.com; client-ip=24.93.47.44; envelope-from=clouduster@austin.rr.com Received: from [10.0.0.99] (cpe-72-177-106-38.austin.res.rr.com [72.177.106.38]) by ms-smtp-05.texas.rr.com (8.13.6/8.13.6) with ESMTP id l1M4U4Eh009507 for ; Wed, 21 Feb 2007 22:30:04 -0600 (CST) Message-ID: <45DD1C4A.5030105@austin.rr.com> Date: Wed, 21 Feb 2007 22:30:02 -0600 From: Dennis Haverlah User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.7.2) Gecko/20040804 Netscape/7.2 (ax) X-Accept-Language: en-us, en MIME-Version: 1.0 To: Rotary motors in aircraft Subject: Re: [FlyRotary] Re: Another exploding cigar?? References: In-Reply-To: Content-Type: multipart/alternative; boundary="------------080107070409000601040803" X-Virus-Scanned: Symantec AntiVirus Scan Engine This is a multi-part message in MIME format. --------------080107070409000601040803 Content-Type: text/plain; charset=us-ascii; format=flowed Content-Transfer-Encoding: 7bit Although I'm only aware of one Renesis powered plane now flying the Renesis exhaust is much quieter, exits the engine at a lower temperature and is not nearly as sharp a pulse as the earlier 13 b engines. Is Tracy still the only person with a Renesis flying? Dennis H. Ed Anderson wrote: > Hi Allen, > > Yes, the temps get up there a bit. Stainless steel is pretty much the > standard although heavy gauge mile steel can work - but generally too > heavy for an aircraft. I think the two mufflers already mentioned the > FlowMaster Hushpower II and the SpinTech are two that have flown and > survived. I do not now of any specs for an exhaust system, it would > depend a lot on the type of installation involved. > > Ed > > ----- Original Message ----- > From: Allen Slominski > To: Rotary motors in aircraft > Sent: Wednesday, February 21, 2007 9:48 PM > Subject: [FlyRotary] Re: Another exploding cigar?? > > Ed, > > I'm a newby to the rotary, but I understand that the temps are > pretty outrageous also. Somethink like 1700 to 1900 degrees F. > Does anyone have a spec or detail for exhaust systems? Mufflers > would be nice also. > > Allen Slominski > Houston, TX > > Ed Anderson > wrote: > > Hi Dave. > > Basically, the Swiss muffler is attributed to the tough noise > abatement rules of the Swiss government for aircraft > - including small GA and experimental. Tony Bingelis who > wrote a column of "How to" for Sport Aviation for years > included it in one of his books "FireWall Forward"-Page 112. > > The muffler (as shown in his book) was an aluminum tube 3 1/8" > in diameter about 4 -5 feet long. A stainless steel mesh was > rolled into a smaller diameter tube to be stuck in the > middle after fiberglass cloth was wrapped around the mesh > tube. This was all stuffed in the 3 1/8" aluminum tube making > a very light weight and effective muffler. Sort of a > light weight glass-pack muffler. > > It was then hung under the belly of the aircraft. > > The problem for the rotary is that the exhaust pulse will > pulverize fiberglass (or almost anything else in short time). > Again, the problem is not the heat its the power of the > exhaust pulse. > > Hope that explained it. > > > Ed > > ----- Original Message ----- > From: david mccandless > To: Rotary motors in aircraft > > Sent: Wednesday, February 21, 2007 6:44 PM > Subject: [FlyRotary] Re: Another exploding cigar?? > > On 22, Feb , at 6:29 AM, Ed Anderson wrote: > > Thanks, Jason. > My experiments with the Swiss muffler did not work out - > Ed > > Hi Ed, > could you explain "Swiss" muffler? > TIA, Dave > > --------------080107070409000601040803 Content-Type: text/html; charset=us-ascii Content-Transfer-Encoding: 7bit Although I'm only aware of one Renesis powered plane now flying the Renesis exhaust is much quieter, exits the engine at a lower temperature and is not nearly as sharp a pulse as the earlier 13 b engines.   Is Tracy still the only  person with a Renesis flying?

Dennis H.

Ed Anderson wrote:
Hi Allen,
 
Yes, the temps get up there a bit.  Stainless steel is pretty much the standard although heavy gauge mile steel can work - but generally too heavy for an aircraft.  I think the two mufflers already mentioned the FlowMaster Hushpower II and the SpinTech are two that have flown and survived.   I do not now of any specs for an exhaust system, it would depend a lot on the type of installation involved. 
 
Ed
----- Original Message -----
Sent: Wednesday, February 21, 2007 9:48 PM
Subject: [FlyRotary] Re: Another exploding cigar??

Ed,
 
I'm a newby to the rotary, but I understand that the temps are pretty outrageous also.  Somethink like 1700 to 1900 degrees F.  Does anyone have a spec or detail for exhaust systems?  Mufflers would be nice also.
 
Allen Slominski
Houston, TX

Ed Anderson <eanderson@carolina.rr.com> wrote:
Hi Dave.
 
Basically, the Swiss muffler is attributed to the tough noise abatement rules of the Swiss government for aircraft - including small GA and experimental.  Tony Bingelis who wrote a column of "How to" for Sport Aviation for years included it in one of his books "FireWall Forward"-Page 112.
 
The muffler (as shown in his book) was an aluminum tube 3 1/8" in diameter about 4 -5 feet long.  A stainless steel mesh was rolled into a smaller diameter tube to be  stuck in the middle after  fiberglass cloth was wrapped around the mesh tube.  This was all stuffed in the 3 1/8" aluminum tube making a very light weight and effective muffler.  Sort of a light weight glass-pack muffler.
 
It was then hung under the belly of the aircraft.
 
The problem for the rotary is that the exhaust pulse will pulverize fiberglass (or almost anything else in short time).  Again, the problem is not the heat its the power of the exhaust pulse.
 
Hope that explained it.
 

Ed 
----- Original Message -----
Sent: Wednesday, February 21, 2007 6:44 PM
Subject: [FlyRotary] Re: Another exploding cigar??

On 22, Feb , at 6:29 AM, Ed Anderson wrote:
Thanks, Jason.
My experiments with the Swiss muffler did not work out -
Ed
Hi Ed,
could you explain "Swiss" muffler?
TIA, Dave

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