Mike, I have a friend who flies a rotary
powered GlasStar who tried the Trapps with about the same results – he took
them off
As best I recall, he said when there were
enough plates to give him his power it was too loud. When there were few
enough plates to quite the sound, the power was knocked down.
Ed
From: Rotary motors in aircraft
[mailto:flyrotary@lancaironline.net] On
Behalf Of Mike Wills
Sent: Monday, January 05, 2009
10:15 PM
To: Rotary
motors in aircraft
Subject: [FlyRotary] Re: 20B
install issues overcome
At one point a few months ago I added a SuperTrapp to my
existing exhaust just to see if it would tame it a little. Cost me about 500RPM
on the top end with little or no improvement in the sound output.
----- Original Message -----
Sent: Monday, January
05, 2009 11:49 AM
Subject: [FlyRotary] Re:
20B install issues overcome
Earnest,
I believe that the SuperTrapp muffler is an example of a band gap device and it
worked well, if properly tuned.
I think the large block idea has merit too, but you will have to allow enough
thickness to prevent the tubes that see the exhaust first to fight the harmonic
vibration and heat. Different size diamonds in the exhaust stream might also
help fight harmonics.
Bill Jepson
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