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 <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 -----

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