[C320-list] folding props again

Mon Apr 3 10:16:06 PDT 2006

Don't know the pitch, but the diameter is 16.5.  ASK Gori or Martec. 
THEY KNOW.  I gave this advice before.

The recommended prop is dependent on the engine, the transmission, and
the boat.  Our installation may not exactly match your boat.  ASK THE
EXPERTS!

Steve
Alchemist #909

--- Scott Thompson <sthompson at toad.net> wrote:

> All:  If you look way, way down near the bottom of this message you
> will 
> see my original question, namely what size/pitch I should order for
> the 
> Martec or Gori two-blade folders, given I have the Yanmar 3GM30F and 
> 2.21:1 reduction.  So far, despite all of the replies, no one has 
> offered an answer.  Can no one provide this info?
> 
> Scott Thompson
> 
> 
> Darrell wrote:
> > I have the 3 blade flexifold and appreciate the extra torque when I
> need it. 
> > I also backs the boat up with little to no walk, Darrell
> > ----- Original Message ----- 
> > From: "Walter burnett" <selkie2003 at yahoo.com>
> > To: "C320-List" <C320-List at catalina320.com>
> > Sent: Thursday, March 30, 2006 6:04 PM
> > Subject: Re: [C320-list] folding props again
> > 
> > 
> > The difference in drag under sail between a two and three blade
> folding prop 
> > is insignificant (folded is folded). A three blade does give more
> torque 
> > (bite) for a given size and it typically will run with a little
> less 
> > vibration because the weight is more evenly distributed around the
> center of 
> > rotation.  Some resonance vibration at certain RPMs seems to be
> endemic to 
> > all folding props, probably because of moving parts. As Dick
> suggests, the 
> > three blade folders work better if you do a lot of motoring or
> encounter 
> > heavy seas.
> > 
> >   BTW, I'm very happy with a 3 blade Gori.
> > 
> >   Walter Burnett
> >   Selkie #887
> > 
> > "Richard A. Walker" <dickwalker at att.net> wrote:
> >   On the left coast we motor relatively allot. Up to Catalina which
> is about
> > 78 miles from Coronado we are both into the wind and into a .5 to 1
> kt
> > current. So motoring is the thing. The Autoprop gets WindWalker II
> 7.1 kts
> > at 2600 rpm which is our normal transit mode. In 61/2 years we have
> about
> > 450 hours on the engine.
> > 
> > WE do not use it much for our day sailing, into and out of the slip
> but on
> > the long trips it is well used.
> > 
> > Cheers,
> > 
> > Dick Walker
> > C-320 (687) WindWalker II
> > 740 Olive Ave.
> > Coronado, CA 92118-2136
> > 
> > 
> > 
> > 619.435.8986-----Original Message-----
> > From: C320-List-bounces at catalina320.com
> > [mailto:C320-List-bounces at catalina320.com] On Behalf Of Peter
> Clancy
> > Sent: Thursday, March 30, 2006 4:04 PM
> > To: C320-List
> > Subject: Re: [C320-list] folding props again
> > 
> > Good question. I have the Gori 2-blade folder. Price is a factor
> and you'd
> > probably have a little more drag under sail with the 3-blade prop
> (a racing
> > issue). I have a 10 year old boat with only 360 hours on the
> engine. So, we
> > sail 80-90% of the time. Folks who motor more often, particularly
> in windy
> > and choppy conditions, could probably make a case for the 3-blade
> having a
> > better "bite" and possibly driving the boat better thru such
> conditions
> > although I've never had a problem with my 2-blade folder.
> > 
> > Peter Clancy
> > AROBAN C320 #222
> > Miami, FL
> > ----- Original Message ----- 
> > From: belairlk at aim.com
> > To: C320-List at catalina320.com
> > Sent: Thursday, March 30, 2006 6:52 PM
> > Subject: Re: [C320-list] folding props again
> > 
> > 
> > What is the reason most of this thread prefers the Gori 2-blade
> instead of
> > the Gori 3-blade---other than price.
> > 
> > Len
> > Aqua5 #1070
> > 
> > -----Original Message-----
> > From: Pat Moriarty
> > To: C320-List
> > Sent: Thu, 30 Mar 2006 11:25:51 -0600
> > Subject: Re: [C320-list] folding props again
> > 
> > 
> > So I have the same combo and was thinking about the Gori 2 blade
> > also. How have you liked it so far? RPM vs speed and reverse etc.
> Did
> > you have the 3 blade fixed before?
> > 
> > Pat
> > SEXUALHEELING #130
> > 
> > At 11:16 AM 3/30/2006, you wrote:
> >> I hope I'm not violating any usage clause with this little
> endorsement
> >> but I just acquired and installed a Gori 2 blade from AB Marine in
> >> Newport for my 94' hull #141 with a Perkins. They beat every price
> I
> >> could find on the net and more importantly were very knowledgable
> and
> >> helpful during prop selection and sizing. The fella I dealt with
> was
> >> Geoff Prior [geoff at ab-marine.com]
> >> Mike LaChance
> >> Seychelle, #141
> >>
> >> -----Original Message-----
> >> From:
> > C320-List-bounces at catalina320.com
> >> [mailto:C320-List-bounces at catalina320.com] On Behalf Of Scott
> Thompson
> >> Sent: Thursday, March 30, 2006 11:50 AM
> >> To: C320-List
> >> Subject: [C320-list] folding props again
> >>
> >> Sorry to beat a dead horse, but I can't seem to find the answers
> in the
> >> older threads on this. Surprise is 1999 wing keel model, hull 653.
> She
> >> has the Yanmar 3GM30F, continuous HP rating 24.1HP at 3400 RPM.
> Her
> >> gearbox has 2.21:1 reduction in forward gear.
> >>
> >> For cost reasons and to get minimal drag I'm only looking at the
> Gori
> >> and Martec 2 blade folders. What pitch and diameter of these props
> >> would be recommended for my boat? Am I correct that the shaft is 1
> >> inch, standard US taper?
> >>
> >> Who has the best deals on these props? Any reason to prefer Gori
> to
> >> Martec or vice versa? I've read good things about both.
> >>
> >>
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