Typically the measurement for cars and motorcycles is at 50 feet away at 90 degrees to the directin of the exhaust flow. Any in-cabin measurements wouldn't need orientation, just put the pick up about where your head is.
-----Original Message-----
From: Steve Thomas <glasair2@me.com>
To: Rotary motors in aircraft <flyrotary@lancaironline.net>
Sent: Thu, Jul 29, 2010 9:31 am
Subject: [FlyRotary] Noise Measurements
I want to take some noise measurements today with a new muffler I just
installed. What is a reasonable distance from the aircraft to be taking these
measurements? Right next to the airplane seems to be somewhat unreasonable, and
distance makes a big difference.
Best Regards,
Steve Thomas
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