I do have a spare 2 blade fixed that was on my C&C 40 that you can try, I
suspect it will be a lot closer than what you are using now, and I am in the
Shelburne shipyard to get it, my shaft is 1 1/8” the replacement prop is 16 x
11, my 3 hm27 will rev to 3000.
George
From: CnC-List [mailto
Goes to Amazon UK??
From: CnC-List [mailto:cnc-list-boun...@cnc-list.com] On Behalf Of Daniel Sheer
via CnC-List
Sent: Monday, December 18, 2017 2:44 PM
To: cnc-list@cnc-list.com
Cc: Daniel Sheer
Subject: Stus-List Prop pitch
Try this spreadsheet.
http://www.surfbaud.co.uk/wave
Try this spreadsheet.
http://www.surfbaud.co.uk/wave/
Dan SheerPegathy - LF 38Rock Creek off the Patapsco
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Thanks everyone for supporting this list with your contributions. Each and
every one is greatly appreciated. If you want to support the list
You REALLY need less pitch and/or less diameter, and maybe less blades. This is
really really hard on your engine.
Joe
Coquina
-Original Message-
From: CnC-List [mailto:cnc-list-boun...@cnc-list.com] On Behalf Of Bunky via
CnC-List
Sent: Monday, December 18, 2017 1:25 PM
To: cnc-list@cn
Thanks for all the helpful comments and thoughts. Luna's problem is that
she cruises under power at about 5.5 kts at 1500rpm, but starts to smoke
and overheat above that. She'll do about 6kts at 1800rpm. Next time I
pull her out, I'll have a closer look at the prop.
I have the original owner's
It is not an exact science, IIRC power boaters will use loaner props and swap
them around to find the best one. It is very hard on a diesel to not be able to
hit the factory spec max RPMs, gasoline engines tolerate this much better.
Joe
Coquina
From: CnC-List [mailto:cnc-list-boun...@cnc-list.c
One advantage of using the manufacturer's recommendation though, is that if it
isn't quite right, they will usually fix it. My three bladed Gori would not
quite get up to max RPM, and smoked a little bit, so I sent it back. They sent
it over to Denmark or wherever they make them and took a
Richard
My MaxProp was set to 14 degrees. Gear ration was 2.6:1
Joel
On Mon, Dec 18, 2017 at 11:24 AM, Dennis C. via CnC-List <
cnc-list@cnc-list.com> wrote:
> Take prop manufacturers recommendations with a grain of salt. Years ago I
> requested a recommendation from Flexofold. The rep at th
Matthew,
They did the same for me in 2011 and 2016. For example here's the 2016
reply:
"With a Universal M25XPB, 26/3000 ( gear reduction ratio 1:2,05 ) we would
recommend a 2-blade 16x12R propeller for your C&C 35mki. Please confirm the
HP/RPM as this engine comes in different variants concerni
Flexofold has gotten better. When I replaced my prop a year ago, they wanted
to know not only shaft size, but also information about my engine and
transmission. This is how they responded:
Hello Matthew
Thank you for the missing gear reduction.
With a Westerbeke W40, max rated 37hp/3000r
Take prop manufacturers recommendations with a grain of salt. Years ago I
requested a recommendation from Flexofold. The rep at the time was Chuck
Angle who was highly regarded. He said he didn't have a good prop
recommendation for my 35-1. :) I went with Martec.
In 2011, I repeated the reque
The problem that I see with this calculator is that there is no value for prop
diameter (and slip is pretty intangible, though I suspect using .10 slip might
be a good approximation for 90% efficiency).
The rule of thumb that a local propshop told me is that changing prop diameter
by 1” is a
Hi
I have 3GM30F with Kanzaki KM3P transmission and 1 inch shaft. Boat is Frers
33 so a bit different. Prop that came with the boat was Martec Eliptical
RH16DX14P-3. This may be of some use.
The Martec was replaced last Fall with a Flex-o-Fold (better reverse/less
vibration). They spec'd t
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