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Position of the static port is critical. We had erroneous IAS when
compared to a calibrated system using a static drogue. It transpired
that the static position had been determined by LOOKING at the manual
rather than measuring. It was only out by a couple of inches but
repositioning as per manual completely corrected the IAS.
The cockpit pressure is definately lower than ambient and an alternate
cockpit staic source will give an apparent increase of 20Kts and an
altitude gain of 200ft (good for showing how fast Your plane goes)!

Cheers

David Byrnes