[C320-list] folding props again
Scott Thompson
sthompson at toad.net
Mon Apr 3 12:31:43 PDT 2006
Actually I'm taking a belt-and-suspenders approach. The prop people
don't sail 320s, and so I'm interested in what is actually working on
boats like mine, in addition to the official recommendations. I'm a bit
surprised to learn from my dealer that Catalina does not have a list of
recommended models. You'd think that this would be a good item for
dealers to make some extra margin on by installing folding props on new
boats.
Orlando.Duran at AveryDennison.com wrote:
> Scott,
>
> Wouldn't be best for you to give all of the info to the prop mfg's and let
> them tell you what would work best on your particular boat? I just went
> thru this exercise with both Flex-O-Fold and Varifold for my new boat, it
> really helps in speaking to the mfg instead of just getting the same thing
> someone else has....
>
> cuba libre 2
>
>
>
> Scott Thompson
> <sthompson at toad.
> net> To
> Sent by: C320-List
> C320-List-bounce <C320-List at catalina320.com>
> s at catalina320.or cc
> g
> Subject
> Re: [C320-list] folding props again
> 04/03/2006 10:10
> AM
>
>
> Please respond
> to
> C320-List
> <C320-List at catal
> ina320.org>
>
>
>
>
>
>
> 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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