I have a 2 blade MaxProp which feathers rather than folds, but I also had a vibration problem. My mechanic suggested that the length of shaft from the strut to the prop was to long. He extended the key slot at the front of the shaft by about 2" and drilled new dimples for the set screws. It got rid of much of the vibration. Not all, but quite a lot. Unfortunately the coupling at the tranny was worn, and eventually the shaft slipped out prior to the start of a race. Was able to re-insert the shaft in the coupling with much grunting and groaning, but missed the race. Had to replace the coupling. Since then all's been good enough.
Dan SheerPegathy - LF38Rock Creek off the Patapsco
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