Buy new underwear at Wall-marts?
The exhaust pipe could be rolling vortexs
off its tips affecting your comm. Antenna.
Ed
From: Rotary motors in aircraft
[mailto:flyrotary@lancaironline.net] On
Behalf Of Bobby J. Hughes
Sent: Tuesday, October 06, 2009
6:54 PM
To: Rotary
motors in aircraft
Subject: [FlyRotary] Mystery Radio
Noise
Got the plane back together late Sunday just in time for a
few laps around the airport. Oil temps showed major improvements with the
larger inlets. Climbing at 100 mph to 3000 ft, 7200 rpm on take off, reduced
to 6500 rpm at 500 ft agl.
Maintained 6500 rpm at 37" MP for several circuits. Oil
temps went to 220F but started to come down when I leveled off. Water stay at
190F or below. OAT was 88F . My new "test" ducts do not
seal as well as the first set so hopefully I still have room for improvement.
While level at 3000 ft \ ground speed showing 145 knots
I pitched the nose down and heard a startling noise in my headset.
Almost like wires shorting. Leveled off and noise stopped. Pitched up no
change. Pitch down the noise returned. I decided it could not be wiring and
repeated this several times. It also happened at slower speeds but I don't
remember at what speed it stopped. It doesn't happen on the ground at full
power run up. My guess is my new exhaust is somehow affecting the comm antenna
when in a nose down attitude. The exhaust ends about 1 ft in front and 1 ft to
the side of the antenna. Any ideas?
RV-10 SC Renesis
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