Brian, This is great insight, big thanks to you for taking the time to respond. Cheers, Chris
Sent from my iPhone > On Aug 5, 2016, at 5:44 PM, cnc-list-requ...@cnc-list.com wrote: > > Send CnC-List mailing list submissions to > cnc-list@cnc-list.com > > To subscribe or unsubscribe via the World Wide Web, visit > http://cnc-list.com/mailman/listinfo/cnc-list_cnc-list.com > or, via email, send a message with subject or body 'help' to > cnc-list-requ...@cnc-list.com > > You can reach the person managing the list at > cnc-list-ow...@cnc-list.com > > When replying, please edit your Subject line so it is more specific > than "Re: Contents of CnC-List digest..." > > > Today's Topics: > > 1. Re: Bad Vibes from Maxprop? (Nauset Beach) > 2. Re: Finally Won a Race (Joel Aronson) > 3. Re: Finally Won a Race (David Knecht) > > > ---------------------------------------------------------------------- > > Message: 1 > Date: Fri, 5 Aug 2016 15:48:18 -0400 > From: "Nauset Beach" <nausetbe...@optonline.net> > To: <cnc-list@cnc-list.com> > Subject: Re: Stus-List Bad Vibes from Maxprop? > Message-ID: <00c701d1ef52$50b63450$f2229cf0$@optonline.net> > Content-Type: text/plain; charset="us-ascii" > > Chris, > > It sounds like the pitch of your prop may be too high. Several of us on the > list have been told by "experts" that X" of pitch was the correct amount for > our engine / gear reduction / boat, only to get excessive vibration and not > be able to reach anything close to maximum RPM even in a full throttle test. > I believe all of us have significantly reduced if not eliminated the > vibration by stepping down the pitch &/or diameter of the prop. > > Possibly a way to test if the vibration is actually coming from the rudder > is to have someone go below and feel the rudder shaft when under power. > Would think you would be able to feel something if the vibration is that > bad. > >> From what I have read, if you went to a 3 blade from a 2 blade the prop > should be considerably smoother. > > Brian > > -----Original Message----- > From: CnC-List [mailto:cnc-list-boun...@cnc-list.com] On Behalf Of Chris > Tirtirau via CnC-List > Sent: Tuesday, August 02, 2016 8:30 PM > To: cnc-list@cnc-list.com > Cc: Chris Tirtirau <christian_tirti...@yahoo.com> > Subject: Stus-List Bad Vibes from Maxprop? > > I got a strange vibration/sound coming from outside the hull, under the > cockpit floor, when motoring in my 37. After seeing two separate mechanics I > was told it was the rudder vibrating and creating harmonics as the water > pushed by the Maxprop flows by it. Apparently harmless but annoying and to > me unsettling nevertheless. I cannot reach cruising speed with that sound > and vibration under my feet. > Any ideas? I have the original 2-bladed prop. Should I revert to original, > or can anything be done about the Maxprop? I talked to the Maxprop people > and I had the pitch set according to their specs but it looks like the C&C > rudder design doesn't like it. > Christian Tirtirau, > C&C 37 Northern Light > _______________________________________________ > > 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! > > > > > > ------------------------------ > > > > ------------------------------ > > End of CnC-List Digest, Vol 127, Issue 25 > ***************************************** _______________________________________________ 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!
