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I found the culprit to be improperly torqued attatchig hardware. The elevator itself is in a low frequency flutter. This could be problematic if left to it's own devices but I found that a change in rear prop RPM would throw the flutter out of phase and interupt the cycle for a while. Anyway two minutes with the end wrenches fixes the problem. One should note that most mechanics fear over tightening the bearings and will not quite finish the job. So a bit more than snug doesthe trick.
_travis
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