I just installed a Gori 3 blade
in our 361, and yesterday we launched her. I had had vibrations with the 2-blade fix, but they were caused by bad alignment and had virtually gone after I fixed it. During the winter I added a drive saver to allow space for a line cutter. Yesterday motoring the engine felt like a pussycat but I did feel a little increased vibration during idling compared with the two-blade fixed. I don’t know if the added weight of the folding prop and the increased distance from the strut may be causing a sort of resonance at that speed. During motoring the vibration disappeared. Another thing, my boat came from factory missing a nut in one of the engine mounts!!!. That really caused quite a bit of vibration particularly at low RPM. Initially the dealer dismissed the problem but after insisting for almost 6 months, Beneteau finally agreed to have it checked and they found the missing nut. That and a new alignment was obviously fixed under warranty, including a new bearing. Even after that, the vibration continued, and only ended after I personally checked the alignment and fixed it to less than 0.003. You can’t really trust any body. Good luck
