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Old Aug 29, 2012, 08:24 AM
kaptondave is offline
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IMO predetermining the cg and then trying to force the plane to fly that way after making the mod is not the best approach. There are too many variables involved. A better way is to make the mod and then determine where the new cg is by doing a series of power-off glide tests with neutral rudder trim. After that do some test flights that include dive tests to verify the configuration. If you wind up with the cg outside the desired range it may be necessary to add ballast. Changing to an aluminum hub and spinner for example will add weight to the front which may have to be compensated for by tail ballast or by bobbing the nose as was done on the "stubby".
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