I think that will be the plan of attack. On Jul 28, 2014, at 10:24 AM, Martin DeYoung via CnC-List <cnc-list@cnc-list.com> wrote:
> I agree with Josh on contacting Hutch at PYI to get the best info. Your > description of being unable to reach full RPM when in gear does sound like a > reduction in pitch is called for. > > I have changed the pitch on Calypso’s MAX Prop several times including the > original effort at installation. For a few years I intentionally ran 10% > over pitch to reduce cruise speed RPM. Before we went around Vancouver > Island (2011) I reduced pitch by one increment to be sure we could achieve > full RPM (horsepower) when motoring into bigger waves and higher winds. The > reduction to cruise speed (at a smooth engine RPM) was about .2 knot with no > measurable change in fuel consumption. > > The MAX prop owner’s manual has the chart that describes the X Y relationship > to pitch. I have heard tales of divers willing and able to change the pitch > on a classic MAX prop underwater. I would not attempt it myself and in the > past set up a deal with a yard to haul and hold in the slings for the change > then re-launch. It may take several haul/launch cycles if you want to fully > optimize the pitch. > > Martin > Calypso > 1971 C&C 43 > Seattle > > <image001.png> > > From: CnC-List [mailto:cnc-list-boun...@cnc-list.com] On Behalf Of Josh > Muckley via CnC-List > Sent: Sunday, July 27, 2014 9:22 PM > To: C&C List; Bill Hoyne > Subject: Re: Stus-List Prop Grease (Now Max-Prop settings) > > Bill, > > Contact Fred "Hutch" Hutchinson at PYI. He'll be able to tell you > immediately where to start. > > hu...@pyiinc.com > > Josh Muckley > S/V Sea Hawk > 1989 C&C 37+ > Solomons, MD > > On Jul 28, 2014 12:16 AM, "Bill Hoyne via CnC-List" <cnc-list@cnc-list.com> > wrote: > Hi All, > I have a Max Prop of unknown diameter (forgot to measure when I had the boat > out of the water). I also have a Volvo Penta 2003 and when I run the engine > in idle I get 3000+ RPM,s but when I run it in gear I only get 1900-2000 > RPM’s. I suspect the pitch is a little high. ( A dripless seal, new shaft and > cutless bering were installed last year and in the process the max-prop was > taken off and may not have been installed with the original specs of which I > don’t have from the PO.) My question in does anybody out there know what the > X,Y values should be for a typical C&C MKII? I would like a starting point to > compare what is in the prop now and where I should head to. The other > question is can I do thin in the water or do I need to haul the boat? > Thanks, > Bill > > Bill Hoyne > Mithrandir > ’74 C&C35 MkII > in Victoria,BC > > > _______________________________________________ > This List is provided by the C&C Photo Album > > Email address: > CnC-List@cnc-list.com > To change your list preferences, including unsubscribing -- go bottom of page > at: > http://cnc-list.com/mailman/listinfo/cnc-list_cnc-list.com
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