Thanks Andy- I had not thought of that specific issue. In fact, I have a Maxprop so that would fit your explanation. Dave
> On Jul 31, 2019, at 11:00 AM, Andrew Burton via CnC-List > <cnc-list@cnc-list.com> wrote: > > I think you are on the right track with your diagnosis. I’ve found that with > a feathering prop if you start sailing faster than the prop is driving the > boat you can get a vibration. I assume this is because the prop partly > feathers. > > Andy > > Andrew Burton > 139 Tuckerman Ave > Middletown, RI > USA 02842 > > www.burtonsailing.com > <http://www.burtonsailing.com/>http://sites.google.com/site/andrewburtonyachtservices/ > <http://sites.google.com/site/andrewburtonyachtservices/> > +401 965-5260 > > On Jul 31, 2019, at 10:05, Matthew L. Wolford via CnC-List > <cnc-list@cnc-list.com <mailto:cnc-list@cnc-list.com>> wrote: > >> Motor sailing as you described should not present any issues. >> >> From: David Knecht via CnC-List <mailto:cnc-list@cnc-list.com> >> Sent: Wednesday, July 31, 2019 9:37 AM >> To: CnC CnC discussion list <mailto:CnC-List@cnc-list.com> >> Cc: David Knecht <mailto:davidakne...@gmail.com> >> Subject: Stus-List Motorsailing >> >> We just got back from a long cruise (long for us- 5 days) where the wind >> tended to be against us every day. We ended up motor sailing some of the >> time fairly close hauled with winds varying 5-10 knots. We were pressed >> for time and wanted to keep our speed up and direction to our destination so >> that ended up with some pinched sailing a bit too close to the wind, but >> better than either motor alone or sail alone. Periodically, (especially as >> the wind increased) the engine/hull would start intensly vibrating and if I >> adjusted engine rpm, I could usually get it to stop. I am presuming that I >> was getting resonances in the engine/prop due to the sails and prop trying >> to drive the boat simultaneously and not always in sync. Obviously strong >> vibrations are not a good thing, but my question is whether motorsailing >> like this is a bad idea altogether due strain on transmission/engine. >> Thanks- Dave >> >> S/V Aries >> 1990 C&C 34+ >> New London, CT >> >> <pastedGraphic.tiff> >> >> >> _______________________________________________ >> >> Thanks everyone for supporting this list with your contributions. Each and >> every one is greatly appreciated. If you want to support the list - use >> PayPal to send contribution -- https://www.paypal.me/stumurray >> <https://www.paypal.me/stumurray> >> >> _______________________________________________ >> >> Thanks everyone for supporting this list with your contributions. Each and >> every one is greatly appreciated. If you want to support the list - use >> PayPal to send contribution -- https://www.paypal.me/stumurray >> <https://www.paypal.me/stumurray> >> > _______________________________________________ > > Thanks everyone for supporting this list with your contributions. Each and > every one is greatly appreciated. If you want to support the list - use > PayPal to send contribution -- https://www.paypal.me/stumurray > Dr. David Knecht Professor of Molecular and Cell Biology University of Connecticut 91 N. Eagleville Rd. Storrs, CT 06269-3125
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