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=20 ----- Original Message -----=20 From: david mccandless=20 To: Rotary motors in aircraft=20 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=20 Hi Ed, could you explain "Swiss" muffler? TIA, Dave ------=_NextPart_000_0004_01C7560F.45FAA1E0 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable

Hi Allen,

Yes, the temps get up there a bit. = Stainless steel=20 is pretty much the standard although heavy gauge mile steel can work - = but=20 generally too heavy for an aircraft. I think the two mufflers = already=20 mentioned the FlowMaster Hushpower II and the SpinTech are two that have = flown=20 and survived. I do not now of any specs for an exhaust = system, it=20 would depend a lot on the type of installation involved. =

----- Original Message -----

From:=20 Allen=20 Slominski

To: Rotary motors in = aircraft

Sent: Wednesday, February 21, = 2007 9:48=20 PM

Subject: [FlyRotary] Re: = Another=20 exploding cigar??

Ed,

I'm a newby to the rotary, but I understand that the temps are = pretty=20 outrageous also. Somethink like 1700 to 1900 degrees F. = Does=20 anyone have a spec or detail for exhaust systems? Mufflers would = be nice=20 also.

Allen Slominski

Houston, TX

Ed Anderson <eanderson@carolina.rr.com&g= t;=20 wrote:

Hi Dave.

Basically, the Swiss muffler is attributed = to the=20 tough noise abatement rules of the Swiss government for = aircraft=20 - including small GA and experimental. Tony Bingelis who = wrote a=20 column of "How to" for Sport Aviation for years included it in one = of his=20 books "FireWall Forward"-Page 112.

The muffler (as shown in his book) was an = aluminum=20 tube 3 1/8" in diameter about 4 -5 feet long. A stainless = steel mesh=20 was rolled into a smaller diameter tube to be stuck in = the=20 middle after fiberglass cloth was wrapped = around=20 the mesh tube. This was all stuffed in the 3 1/8" = aluminum tube=20 making a very light weight and effective muffler. Sort of = a=20 light weight glass-pack muffler.

It was then hung under the belly of the=20 aircraft.

The problem for the rotary is that the = exhaust pulse=20 will pulverize fiberglass (or almost anything else = in short=20 time). Again, the problem is not the heat its the power of the = exhaust=20 pulse.

Hope that explained it.

Ed

----- Original Message ----- =
From:=20 david=20 mccandless
To: Rotary motors in = aircraft=20

Sent: Wednesday, February = 21, 2007=20 6:44 PM

Subject: [FlyRotary] Re: = Another=20 exploding cigar??

On 22, Feb , at 6:29 AM, Ed Anderson wrote:

Thanks, Jason.
My experiments with the Swiss = muffler did=20 not work out -
Ed
H= i=20 Ed,
could you explain "Swiss" muffler?
TIA,=20 Dave

------=_NextPart_000_0004_01C7560F.45FAA1E0--