[C38] Propeller issue follow up

[Mike and Jeannie Yount]

Max and others, I installed a Campbell prop about three years ago. I gave
Campbell all the info they needed to calculate the correct size. Based on
all the info I could find our transmissions have a 2 to 1 reduction.
Campbell said I would need a 14x10 prop.After installing the prop I was
tickled to death. I could motor at 6.9 to 7.2. at 80% power.(so I thought) I
went to open her to see just what she would do wide open.Well, I was  wide
open. I was prop limited by at least 500 rpms.Got to checking ,put a digital
tach on the prop shaft at the rear of the tranny,did the math only to find
out my hurst tranny was a 1.79 to 1.Called Campbell,they said to re-pitch to
14x8.(you are suppose to get 200rpms for every inch of pitch) Long story
short, I lost boat speed and only gained 200 rpms.Tranny went out and I
replaced it with a 2 to 1 reduction,re-pitched the prop to 14x9, still prop
limited and I get soot all over the stern at the exhaust outlet. Campbell's
are nice props ,but make sure you get the right pitch. The cupping on the
blades does put a lot of extra strain on the engine and tranny. You can
really tell a difference sailing with the Campbell over the old 3 bladed
Michigan props.Hope this will help \.
Mike
"Moonraker" C-38 #204


-- Original Message ----- 
From: "Max Soto" <maxsoto at hotmail.com>
To: <listserve at catalina38.org>
Sent: Monday, June 12, 2006 1:04 PM
Subject: Re: [C38] Propeller issue follow up


>
> Hi Charles,
>
> This prop seems to be awsome, do you have their web page???
> This is a fixed prop right??
>
> Thanks
>
>
> Max Soto
> C38 #198 ESTANCIA
> Puntarenas, Costa Rica
>
> >From: Charles Finn <charles at finn.ws>
> >Reply-To: Catalina 38 Listserve <listserve at catalina38.org>
> >To: Catalina 38 Listserve <listserve at catalina38.org>
> >Subject: [C38] Propeller issue follow up
> >Date: Mon, 12 Jun 2006 11:03:06 -0400
> >
> >Based upon our discussions a few months back, I purchased the Campbell
> >Sailor prop  (15 x 9 three blade).  I have the Universal 5424 and have
> >only been able to obtain 5-6 knots at 2400+ rpm.  I had a two-blade
> >fixed prop.  In addition, I had awful "prop walk" and the boat would
> >"thrum" at higher rpms that was wearing over any long motoring.
> >
> >I talked with the Norm Ross at West by North Enterprises and he made
> >three promises:
> >1. The boat will go faster at reduced rpm and will not load the diesel.
> >2. The "thrum" is due to the two-blade prop as it is completely covered
> >by the keel vortex, so it is essentially grabbing more water when it is
> >outside the keel shadow and then relieved when within.
> >3. Prop walk would be significantly reduced.
> >
> >Well, he was right on all three promises!  I now get about 6.5 knots at
> >2000 rpm.  The engine is a lot quieter and the thrum is gone.  I still
> >have prop walk, but it is not nearly as bad.  The prop looks very
> >different from the Michigan Wheel design.   My last test of course will
> >be how the drag will affect sailing, but I suspect I won't seem much
> >(the weather in my area has been absolutely awful for the last 6-7
weeks).
> >
> >Charles Finn
> >Mighty Quinn,  #114
> >Lake Champlain
> >
> >_______________________________________________
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> >Listserve at catalina38.org
> >http://catalina38.org/mailman/listinfo/listserve_catalina38.org
>
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