What Martin said...but I want to emphasize that you need to know your engine model and the reduction gearing on your transmission and the diameter of the prop *before* calling PYI.
They are very helpful and nailed the setting I should use first try. It was only my lack of smarts that led me to using a slightly different pitch the first couple of years. Jim Watts Paradigm Shift C&C 35 Mk III Victoria, BC On 3 January 2015 at 11:04, Martin DeYoung via CnC-List < cnc-list@cnc-list.com> wrote: > I recommend contacting PYI, Inc. and asking for assistance. Be sure to > have your MAX prop owner's manual or obtain another from PYI (often > downloadable from their web site). The manual will have a chart to > indicate what the prop is set at now and which way to go to reduce pitch. > > > > I have changed the pitch several times on Calypso's 3 blade MAX prop. It > is easy to do when hauled out. The hard part is getting it just right. > The guys at PYI will be able to give a good starting point after you tell > them what engine and reduction gear you have. > > > > After intentially over pitching Calypso's prop by 10% for 10 years (for > longer trips in calmer PNW waters) I "downshifted" to 10% under pitched > to be sure our Perkins 4-108 could reach max RPM when motoring into wind > and waves. We were planning a trip around Vancouver Island. The > conditions on the west side of the island can be boisterous and I wanted > the extra safety factor of being able to power into offshore wind and wave. > > > > I have not noticed any increase in fuel consumption at normal cruising > speed but the engine is spinning faster if I push towards hull speed. The > lower pitch accomplished what I wanted in regards to powering into bigger > wind and seas. > > > > Martin > > Calypso > > 1971 C&C 43 > > Seattle > > > > > ------------------------------ > *From:* CnC-List [cnc-list-boun...@cnc-list.com] on behalf of Rex & > Jennifer Delay via CnC-List [cnc-list@cnc-list.com] > *Sent:* Saturday, January 03, 2015 10:33 AM > *To:* cnc-list@cnc-list.com > *Subject:* Stus-List Max Prop > > We have a new to us C&C 41 with a Max prop which is severely > overpitched. Does anyone know the correct settings for when I haul it? > > > > Rex & Jennifer Delay > > www. Ghostlake.com <http://www.ghostlake.com/> > > www.ghostlakesailing.com > > > > _______________________________________________ > This List is provided by the C&C Photo Album. > > Please donate to the C&C Photo Album to keep this list free for all > subscribers. > > 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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