I just collected data from two flight tests, one an RV-6,
the other an RV-9A. The six's TAS from IAS was 11 mph high, the nine's was 9-10
mph high. Another 9 builder there when we discussed it said his was also about
10 mph high. The two 9s used the Cessna-type disc on both sides of the fuselage
at the recommended location, and the 6 had the Van's pop rivet
port.
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