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
Ed Anderson
Rv-6A N494BW Rotary Powered
Matthews, NC
From: Rotary motors in aircraft [mailto:flyro
tary@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 bl
ock 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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