Joel reminded me, I forgot to mention that a properly pitched prop will reach max engine RPM. My Yanmar has an instantaneous rating of 3600rpm, a 1 hour rating of 3400rpm, and a continuous rating of 3200rpm. The correlating horse power changes with each rating. I chose the 1 hour rating when setting the pitch on my Max-Prop. This ensures that I can get max punch when needed but crack off for cruising. If you have a diesel, remember they like to run at 80% load as often as possible. I know I'm there when I see 2600-2800.
Josh On Wed, Feb 3, 2016, 5:09 PM Sam Wheeler via CnC-List <[email protected]> wrote: > Hi everyone, > > I recently bought a 35-3, and one of the projects it came with was the > prop had galvanic corrosion and needed to be replaced. It's a fixed two > blade. > > The previous owners adjusted the pitch on it, apparently from 10 to 8. > They seemed to think that improved performance but the boatyard is telling > me that the specs for the boat and engine call for 10. Does anyone have > any thoughts on this? > > Thanks, > Sam > > > ---------- Forwarded message ---------- > From: Carston Grasvik <[email protected]> > Date: Wed, Feb 3, 2016 at 8:19 AM > Subject: FW: Propeller for C&C 35 > To: Sam Wheeler <[email protected]> > > > Hi Sam, > > > > It appears your old prop has an odd pitch to it. The prop I estimated for > you has a 10 degree pitch which is specified for your boat and engine. > Please see note below from our prop people and advise what you’d like to do. > > > > Best Regards, > > > > Carston > > > > *From:* Ernel Elkin [mailto:[email protected]] > *Sent:* Monday, February 01, 2016 3:47 PM > *To:* Carston Grasvik > *Subject:* Propeller for C&C 35 > > > > HI CARSTON - DAVE MEASURED THE PITCH ON THE 2 BLADE AND IT IS 8"! > UNFORTUNATELY, THE PROP I FOUND FOR YOU HAD ALREADY BEEN REPITCHED FROM 12 > TO 10 AND CAN NOT BE REPITCHED ANYMORE. IT WOULD PROBABLY CRACK. > > > > I LOOKED AROUND AND FOUND ANOTHER 18"X 10", BUT THE PILOT BORE IS 1-1/8", > SO THE CUSTOMER WOULD HAVE TO USE A BUSHING WITH IT AND HAVE IT REPITCHED > TO 8". BUSHING COST IS $74 AND REPITCHING IS $150. > > > > KIND OF A WEIRD SIZE. THE LOWEST PITCH AVAILABLE IS 10". PLEASE DISCUSS > WITH YOUR CUSTOMER. THANKS. > > > > ERNEL > > _______________________________________________ > > Email address: > [email protected] > To change your list preferences, including unsubscribing -- go to the > bottom of page at: > http://cnc-list.com/mailman/listinfo/cnc-list_cnc-list.com > >
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