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

[Jeffrey Hare]

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