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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?
Bobby J
Hughes
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