This may just confuse thing as our engine is an atypical Yanmar Model: 3JH2-TBE so has a turbo and 47 Hp.
Anyway, these are the specs on our prop and its pitch setting in inches (I don't know what that translates to in degrees): Propeller Make: “J” Prop, Marine Propeller s.r.l Propeller Size: 18” - 3 blade Pitch: Set between Notches 7 & 8 R (19") Ken Heaton & Anne Tobin S/V Salazar - Can 54955 C&C 37/40 XL - Hull # 67 Cape Breton Island, Nova Scotia http://www.racethecape.ca/the-race/entrants/salazar/ On 24 March 2016 at 09:21, Josh Muckley via CnC-List <[email protected]> wrote: > Double check the size. I think mine is a 16" and I thought it was at > 24°. I also suggest getting a laser tach from Amazon. The Yanmar tachs > are notorious for being about 200 rpm slow. Mine was. > > It sounds like you already know that the pitch can only be changed in 2° > increments and for every 2° you change rpm by about 10%. > > What do you want to consider max RPM? Mine had 3, > max instantaneous = 3600 > Max 1 hour = 3400 > Max continuous = 3200 > > It is best to run at 80% load as often as possible. So for me I pitched > the prop to 3200 max and try to run at ~2500. > > You'll also find that a dirty prop, shaft, and bottom can significantly > change the load and subsequently change the max achievable rpm. If your > surveyor was basing his advice on your boat with a dirty bottom and prop > then you may not need to do anything other than get them cleaned. > > Engine/fuel problems resulting in reduced power output can also lead one > to believe that the bottom is dirty or the prop is incorrectly pitched. > > When I adjusted my pitch I simply changed it by 1 increment (2°), with > plans to do additional adjustments in future years if need be. PM me if > you'd like any other guidance/advice/details. > > Josh Muckley > S/V Sea Hawk > 1989 C&C 37+ > Solomons, MD > > I have a 3 blade Max Prop, 17". The surveyor said to adjust propeller > pitch to allow the engine to reach top speed in gear. > The current settings are for 24 degrees. > I think I am supposed to reduce the angle. > I do not know how far off the speed is, so I am thinking of starting at 22. > Anyone else with a 37/40 know their pitch or angle? > > Brian Fry > La Neige > 37/40 XL > Havre de Grace MD > > _______________________________________________ > > 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! > > > _______________________________________________ > > 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! > >
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