I wonder if the prop isn't opening properly? Andy C&C 40 Peregrine
Andrew Burton 61 W Narragansett Newport, RI USA 02840 http://sites.google.com/site/andrewburtonyachtservices/ +401 965-5260 > On May 8, 2016, at 18:40, Andrew Means via CnC-List <cnc-list@cnc-list.com> > wrote: > > Boat: 1977 C&C 34 > Engine: Yanmar 3GM30 (F) > Prop: 3 Blade Max Prop > > Recently I noticed that when engaged in forward-drive, at low RPM, it almost > feels like something is banging against the bottom of the hull, like a piece > of kelp or rope tangled in the prop. Once the RPMs get above 1400 or so the > roughness goes away completely and everything feels very smooth. > > Additional info: > > + Looking at the propshaft and listening for knocks coming from the engine > doesn’t reveal anything obvious. > + We ran aground recently, but just the keel in soft sand. Bottom was painted > between now and then and yard didn’t report anything amiss. > + In reverse at the same RPMs everything feels pretty smooth. > > I’m waiting for the next 80° day to dive under the boat and see what I can > see, but was wondering if that’s even where I should be looking. Does this > sound familiar to anybody else? > > Andrew > > -- > Andrew Means > S.V. Safari - 1977 C&C 34 Mk I > Seattle, WA > _______________________________________________ > > This list is supported by the generous donations of our members. If you like > what we do, please help us pay for our costs by donating. All Contributions > are greatly appreciated!
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