[C320-list] Gori-Prop buyer question - Not a prop manufacturer debate

[Len]

Jeff,

If I understand you correctly, you have Gori 15 x 10 with 3GM30 (same pitch
as factory prop). And you like the performance.
With my 3YM30 and lower ratio tranny, Gori recommended 15 x 12 (1 pitch over
factory).  But now it seems they recommend 15 x 11---which you also think is
best for my boat.

Do I have it right?   (as incoming Chief Measurer I have to check All
measurements!)

Len


On 9/18/06, Jeffrey Hare <catalina at thehares.com> wrote:
>
> Hmm.
>
> I have a Gori 15x10 on my boat.  Your transmission spins slower than mine
> so
> you'd need a little more bite.  On my boat, the 10 pitch prop is
> *slightly*
> overpitched, since I'm ~150RPM shy of 3600 (according to my Tach) which
> could be missing a beat here or there.  That 150RPM is maybe close enough
> to
> the Yanmar spec to not worry about?
>
> I assume you give the guys the transmission ratio?  I'd check with the
> C320
> owners with your engine/transmission ratio and see, but I still think the
> 11
> pitch would be better for your boat.  I have some contact info for at
> least
> one person with your engine/tranny combo that installed the Gori 15x11x3.
>
> I'll dig it up and forward it to you.
>
> I think if you went with the 10 pitch, then you wouldn't be able to motor
> any faster than you do today (unless you went into overdrive).
>
> -Jeff
>
>
> -----Original Message-----
> From: Pat Moriarty [mailto:patm at psiurethanes.com]
> Sent: Monday, September 18, 2006 1:36 PM
> To: C320-List
> Subject: Re: [C320-list] Gori-Prop buyer question - Not a prop
> manufacturer
> debate
>
> 10 PITCH IS GOING TO GIVE YOU MORE RPM THAN 11 PITCH...THEY GOT IT
> RIGHT FINALLY.
>
> PAT #130
>
> At 12:33 PM 9/18/2006, you wrote:
> >I stopped by the AB Marine booth at the Newport boat show this last
> >weekend and talked to them about purchasing a Gori 3 blade prop.
> >I told them how we have all been discussing the proper pitch that
> >people have found based on experience so I suggested the 15x11 3
> >blade RH model based on the "1 pitch higher than factory prop"
> >rule.  He wrote to me today and said this:
> >
> >"Based on calculations and also other C-320 owners sea trial results
> >the propeller will be a 15 x 10 x 3RH propeller."
> >
> >This surprised me as he said the 15 x 10 was found to be the ideal
> >propeller.  Does anybody have the Gori 3 blade 15 x 10?
> >I know that the some of the people who have the 15 x 11 have said
> >they can't reach max RPMs so I'm wondering if he is correct.
> >
> >BTW: I have the 3GM30.  Hull #447.
> >
> >Thanks,
> >
> >Chris Holt
>
>
>
>