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

[Chris Holt]

I believe that Jeff's factory prop was a 15 x 9.   Correct me if I'm wrong 
Jeff?

----- Original Message ----- 
From: "Len" <aqua5len at gmail.com>
To: <catalina at thehares.com>; "C320-List" <c320-list at catalina320.com>
Sent: Monday, September 18, 2006 2:16 PM
Subject: Re: [C320-list] Gori-Prop buyer question - Not a prop 
manufacturerdebate


> 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
>>
>>
>>
>>
>