Wow, you ought to be able to get up to eight knots with that setup.
Bill Coleman
-------- Original message --------
From: Ken Heaton via CnC-List <cnc-list@cnc-list.com>
Date: 3/27/2016 2:46 PM (GMT-05:00)
To: cnc-list <cnc-list@cnc-list.com>
Cc: Ken Heaton <kenhea...@gmail.com>
Subject: Re: Stus-List Max prop angle
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 <cnc-list@cnc-list.com>
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
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_______________________________________________
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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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!
