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Old Jul 22, 2012, 02:42 AM
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South-west France
Joined Sep 2007
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Quite right Colonel, the "uncovered" CG needs to be somewhat forward of the finished CG due to the extra covering weight at longer moment aft.

I don't know for sure where the Ajax CG should be, but as it has a relatively large and cambered tailplane I would expect that it would be happy with it further aft than your typical radio model. The Witch, similar layout, flies very happily with the CG at 60 percent which is just in front of the free-flight position, my instinct with the Ajax would be to aim for 40 - 45% rather than the 30-35% which would be the recommendation for a "normal" sport radio model. This should be completely safe, but the old truism about tail heavy models only flying once still applies, so if in doubt err on the forward side!
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