Thanks to everyone who gave me input on my altitude hold proposing problem.
It flew perfectly stable during today's test flight. My main static port is
located on the pitot tube which is connected to a manifold just inside the
fuselage next to the pilots leg. Static instruments, AOA, and autopilot
pressure transducer are all connected to this manifold. I installed two
dedicated static ports just for the autopilot pressure transducer. These new
Ports are located
At the position recommended by the factory for the main static ports just
aft of the baggage door. The second port was placed on the other side of the
fuselage. The altitude hold worked perfectly, even in some choppy air.
Problem solved.

Thanks
Skip

Skip Long
N47SL, HWD
(650) 578-9167
FAX  576-9153
mailto:skiplong@videocomm.com