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Date: Sun, 06 Dec 2009 12:32:22 -0500
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Subject: fluctuations in static system
From: Keith Smith <keith.smith@gmail.com>
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Hello again,

Watching the videos from previous flights, I notice the VSI/ASI and
altimeter 'bouncing' around (in the case of the altimeter +/- 10-15ft)
after power is applied during the takeoff run.

I haven't yet established more a pattern than that (ie. any trends
related to engine power or speed once airborne), but the problem is
more or less consistent. I haven't tried engaging the alt static port
in flight, but will do that on tomorrow's test flight before the plane
goes to the shop.

Has anyone encountered anything like this before? I have seen cockpit
videos of other 360's and haven't seen the issue, so it's certainly
not a problem native to the design of the aircraft.

I'm not sure if there is a burble around the static port due to some
strange airflow around the ports, or if there's a small blockage
within the static system.

Any thoughts on likely causes? I'll report back after the alt static
test tomorrow, and then, ultimately on the diagnosis from the shop
once it's done.

Thanks,
Keith