[C320-list] Gori-Prop buyer question -Notapropmanufacturerdebate

[Jeff Church]

Jeff,

For what it's worth, I was referring to Catalina's current specs for the 320 
which indicate that the 3 blade prop has 11 inches of pitch. I don't doubt 
that the prop pitch varied over the years with different engine/trans 
combinations, and I hope Chris takes that into consideration as he reviews 
other boater's results. There are other things that he needs to consider.

 I was talking to the owner of Max Prop today and he said that there are a 
lot of variables besides engine/trans ratio that go into determining the 
correct pitch for a given model of boat. Combinations of factors such as 
water temperature and salinity, how heavily loaded the boat is, how clean 
the bottom is, and predominant sea state are among the things that will 
influence your pitch selection. Chris should take this into account when 
attempting to use other boater's results to make his decision.

One reason that an adjustable pitch prop might have a big advantage over the 
non-adjustable Gori or Autoprop is it takes some experimentation to get to 
the right pitch for your specific boat. Initially I pitched my MaxProp to 
the manufacturer's pitch recommendation, but over the years I have done an 
increasing amount of distance sailing and gone from pitching the prop for 
clean bottom - lightly loaded - flat water conditions, to dirty bottom - 
loaded for cruising - heavy weather conditions. A difference of 4 degrees (2 
inches) of pitch.

Jeff


----- Original Message ----- 
From: "Jeffrey Hare" <catalina at thehares.com>
To: "'C320-List'" <c320-list at catalina320.com>
Sent: Monday, September 18, 2006 5:21 PM
Subject: Re: [C320-list] Gori-Prop buyer 
question -Notapropmanufacturerdebate


>
> JeffC,
>
> That's not really true.  It depends entirely on which engine and
> transmission combination you have.  For Yanmars 3gm30f, Catalina specs, 
> 15x9
> and 15x11 depending on the transmission ratio your boat came with.
>
> The 3YM will be different, and the Perkins & Westerbekes have their own 
> spec
> from Catalina.
>
> -JeffH
>
>
> -----Original Message-----
> From: Jeff Church [mailto:jjemail at comcast.net]
> Sent: Monday, September 18, 2006 6:05 PM
> To: C320-List
> Subject: Re: [C320-list] Gori-Prop buyer question -
> Notapropmanufacturerdebate
>
> And to further confuse matters, according to Catalina's specs the 3 blade 
> is
> 15x11.
>
> JeffC
>