Mike I Green wrote:
Wouldn't it be sufficient if the other glider was calibrated?
mg

I'm not sure what you mean by sufficient, but in any case, using a
comparison sailplane (calibrated or not), was not what the original
poster had in mind.

The advantage of a using a calibrated sailplane for the comparison is
you could actually calculate a polar, rather than just a relative
performance curve. Perhaps that was what you meant?

Eric Greenwell wrote:


Here's another way that flight logs might used: Comparison flights
using GPS logs to determine the difference between gliders would be
useful, but that requires at least two gliders to fly together at the
same airspeed; again, useful, but as you point out, not an answer to
the original question.




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Eric Greenwell
Washington State
USA