| Al,
Per Lynn H., the p-port is very sensitive to exhaust back pressure. So, I made sure to put lots of V-shaped slots in the inner pipe, 109 to be exact. My goal with my tangential muffler design was to dissipate the exhaust heat energy, chop up the exhaust pulses into small pieces while minimizing back pressure. The jury is still out as to how successful I was at meeting these three goals, but my initial impressions are favorable.
Mark
On Fri, Apr 9, 2010 at 12:29 PM, Al Gietzen <ALVentures@cox.net> wrote:
I’d expect it to be very effective.
Is the total area of the slots = or >
than the x-section of the 2 ½” pipe?
Is the P-port less sensitive to exhaust
back pressure?
Al
-----Original Message-----
From: Rotary motors in aircraft
[mailto: flyrotary@lancaironline.net] On
Behalf Of Mark Steitle
Sent: Friday, April 09, 2010 7:47
AM
To: Rotary motors in aircraft
Subject: [FlyRotary] Re:
Tangential muffler
Al,
The slotted tube exits through the aft end of the
muffler. It is 2-1/2" the whole way. I slotted it after I was
unable to drill holes through the SS. Cutting 1" slits was very
easy. After making the cuts, I took a hammer and chisel and made a
"V" shaped indent on one side of the cut to increase the exit area
provided by each cut and to encourage the exhaust gasses to flow toward the
exit. Seems to be working. I'll take some sound measurements a
little later on.
Mark
On Fri, Apr 9, 2010 at 11:13 AM, Al Gietzen <ALVentures@cox.net> wrote:
I should make it clear that my tangential muffler uses
a slotted tube that runs down through the length of the 5" tube. This
tube is also inconel and is welded to both ends, thereby adding strength to the
flat ends. I utilized Lynn's coupling design to allow for movement
between the muffler and the engine.
Mark;
This
is interesting. Would you care to give a bit more info – or perhaps
provide a sketch? Where is the exit from the muffler? Does the exhaust exit
through the slotted tube? How big is the tube?
Al
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