I purchased my boat, a 1984 35Mk3 three years ago. The first season the boat would vibrate badly when I'd slow down under power. I'd put it in reverse, throw it into forward (ouch) and things would be fine. The blades always opened initially when I motored off the mooring but if I slowed down the flow over the blades exceeded the centripetal force and folded one of the blades and not the other . So, that winter I sent the 2 bladed prop back to Martek to have it rebuilt. They said the blades were so badly oxidized that they couldn't weld them to build up the stops so, they replaced the blades with another pair (used) they had available. To be sure the problem was fixed I also had the cone clutch in the transmission replaced. Last summer the only thing that changed was that the boat now moved forward when the lever was pulled back to reverse and visa versa. The vibration still happened under the same scenarios. Having had the blades replaced and the transmission rebuilt there was no way to tell whether it was that the blades were the opposite hand as what I had previously or if the transmission was done incorrectly.
This spring I purchased a 2 blade Flexfold geared prop and guess what, the vibration problem is still there and forward and reverse are still, yep reversed. So, I know that the direction issue is the transmission and that is easily fixed by rotating the linkage arm. But, I'm totally baffled as to why the vibration problem has not been resolved. So, if anyone has any suggestions or ideas they would be greatly appreciated. Dave J Saltaire C&C 35Mk3 Bristol, RI
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