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Ed, you are referring to the VAM which did not have a cooling tube, just an open end. It was very loud, I understand. It was in looking at the VAM that Ed Klepeis and I finally asked each other, what if we weld a tube in there? We still think it is a good idea. The large diameter is also important. The idea is that the exhaust gases will lose heat and energy (sound) as they expand within the can. Also, note the exit pipe (rectangular, 1.75 x 4) is has a much larger area then the two 2" o.d. pipes coming out of the engine. The idea is to create a completely free flowing exhaust in which the exhaust gases become very disorganize as they expand and cool. Jerry
On Tuesday, March 8, 2005, at 03:50 PM, Ed Anderson wrote:
Well, I hope it works out. A somewhat similar muffler (although not as
large in diameter) with a cooling tube has been tried. It was fired up at
Tracy's, it is my opinion that the design failed to mute the exhaust very
much. But, not certain how much the two designs have in common other than
appearances. Seeing as the exhaust BTU is equivalent to approx twice the
heat discharged through the radiators and mufflers together, it is my
opinion, that its going to take a LOT of cooling air to make any difference
in temps of the oven. However, I would love to see it work, I've got the
room - just can't take the heat. {:>)
Ed
----- Original Message -----
From: "Jerry Hey" <jerryhey@earthlink.net>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
Sent: Tuesday, March 08, 2005 3:33 PM
Subject: [FlyRotary] Re: Tangential muffler
Thanks for your comment Ed. The cool tube is intended to extract a
lot of that heat and pump it overboard. We shall soon see if it works
as Bob White will be running his engine soon. I got my fingers
crossed.
On Tuesday, March 8, 2005, at 03:17 PM, Ed Anderson wrote:
Jerry, Tracy Crook flew with a similar Tangential muffler for a number
of
hours. The neat thing is it does fit under the cowl and suppress sound
nicely, the un-neat thing is it acts like a large oven under the cowl
and
keeps cowl temps highly elevated. I am fairly certain that is why
Tracy
removed it.
Ed A
----- Original Message -----
From: "Jerry Hey" <jerryhey@earthlink.net>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
Sent: Tuesday, March 08, 2005 3:01 PM
Subject: [FlyRotary] Tangential muffler
From the "other" list comes the report that someone has tested a
similar exhaust system to what I have been building on his PowerSport
p
ported engine. . He reports the muffler worked well to quiet the
exhaust note and that the engine seemed to breath freely. The neat
thing about this exhaust system is that it fits inside the cowl.
Here are a couple of photos showing the muffler on a Mustang 2. The
muffler is 6" o.d. x 10 inches long. Construction is 321 16 gage.
The cool tube running through the center is intended to cool the
exhaust gas. Fresh air is plumbed through it. The engine mount is
the S-beam. Jerry
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