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Dan:

Agree that for most general aviation flying, forget the aerodynamic heating
and compressibility effects.  I got focussed on this topic when Brent Regan
and I were preparing to the Denver to OSH race.  In Brent's Lancair IV racing
at 320 knots TAS, the aero heating is about 20F and the TAS error is about 20
knots.  I think you would agree that errors of this size are not negligible.  
Keep in mind that this forum has Lancair IV builders also.

Even a strictly stock Lancair IV at 290 Knots has a TAS error of more than 15
knots if you use a standard E6B and cockpit readings with accurate
instrumentation.  I have grown tired of Lancair IV jockies claiming 310 knot
cruise speeds when it ain't so, and so want to save others from possible
embarassment and disappointment when they learn the limitations of their
instrumentation.

I am in complete agreement concerning the accuracy of most general aviation
instrumentation: awful.  Brand new tachometers that read 100 RPM low, fuel
level gages that work "kind of," and temperature instrumentation that should
be marked as "cold - warm - hot" instead of in degrees.  We should expect
better. And we should strive for better.

Fred
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