I put a used 2 blade geared Gori, non racing version, on my 27 MKIII about 6 
years ago. It replaced a fixed 2 blade 12 X 8
Michigan Wheel. I have been completely satisfied with the result and noticed no 
change to the amount of vibration or noise, but
with a single cylinder engine there is a fair bit of both. Back up performance 
is better if anything, a fact which I attribute to
the greater surface area of the Gori blades. I grease the prop with Lewmar 
winch grease every year, but there is not the slightest
trace of grease by haul out in the fall. Engine is YSB12 and prop size is 13 X 
9.
Steve Thomas
C&C27 MKIII


-----Original Message-----
From: CnC-List [mailto:cnc-list-boun...@cnc-list.com]On Behalf Of 
cenel...@aol.com
Sent: Monday, February 11, 2013 9:47 PM
To: cnc-list@cnc-list.com
Subject: Re: Stus-List tip clearance


When my old (15 year with one rebuild) MaxProp was replaced last spring, I went 
with a Gori 2 blade racing prop which was
discounted
at the time I bought it. My research showed that it had barely measurable drag.


After various discussions with Geoff of AB Marine, I got a 16 x 11 (I think) 
for my 36XL/kcb. I had to rely on some sketches from
my diver
regarding prop clearance, etc. so I was a little nervous about ordering it with 
the boat in the water.


Yard installed it, no vibrations, excessive noise, etc. basically no issues at 
all except for me learning that it takes a little
more time in reverse
to 'catch' the water and get some flow over the rudder for steerage.


Although there were other issues addressed including a re-faired and new 
centerboard at the same time, I am now competitive with
other similarly
rated boats that I was not competitive with prior to this.


She reaches hull speed at the recommended shaft RPM which matches the 
recommended Beta 1005 cruising RPM.


I am completely satisfied with the switch and only hope that the prop life is 
reasonably long.


Charlie Nelson
Water Phantom





cenel...@aol.com




-----Original Message-----
From: Eric Baumes <eric.bau...@gmail.com>
To: cnc-list <cnc-list@cnc-list.com>
Sent: Mon, Feb 11, 2013 9:25 pm
Subject: Re: Stus-List tip clearance


Chris,


What model do you have?


I just yanked my Gori 2-blade prop off my 34/36. I put it on last year and when 
it first went on the boat shook like crazy. I got
100 yards out of the marina, throttled up then turned around. The yard hauled 
the boat, check the shaft for true, put it back in
the water, aligned the engine, drove it, aligned the engine again.


I picked the boat up as the racing season had started, and took the boat 9 
hours to a regatta. On the way home I brought it back
to the boat yard as the vibration was still bad except for a few RPM bands. I 
talked with AB marine and they didn't have a 1 1/8'
hub but swapped out the blades. The boat came out of the water, blades swapped 
and went back in. It was better, but when I took
the boat out on a cruise, I found the vibration/noise and the complaint of my 
wife who sleeps in the aft cabin when I leave
anchorage early that it was much louder than last year.


As I said, I had the yard pull the prop and I am going to contact AB Marine 
this week. Given everything I went through last year,
I am really tempted to just get a martec. If they tell me the prop is fine, 
then I don't want to put it back on the boat. If they
tell me it had to be balanced, I am not sure I trust putting it back on the 
boat.


Eric
34/36 #74


On Fri, Feb 8, 2013 at 7:55 PM, Chris Tassone <ctass...@charter.net> wrote:

  Steve,
  Thanks for getting back to me.  I doubt getting this Gori 2-blade 16.5 x 11 
RH  prop rebalanced will help since I already did
this and the results we're negative.  After trying to resolve this for the last 
three years I think the only solution is a new
prop.  I relied on your company's expertise to size this prop for me and I made 
a mistake that I will have to live with.  If you
know of anyone that wants to buy a prop please let me know.  Thanks for your 
concern.
  Chris
    ----- Original Message -----
    From: Steve Armitage
    To: Chris Tassone
    Sent: Friday, February 08, 2013 12:22 PM
    Subject: Re: tip clearance


    Dear Sir,


    Perhaps the thing to do is have the propeller removed and re-balanced as i 
think you have enough tip clearance and don't see
this as an issue.  Sorry that i cannot be more helpful than that.

    Regards, Steve Armitage
    AB Marine, Inc

    747 Aquidneck Ave
    Middletown, RI 02842
    sa...@ab-marine.com
    401-847-7960



    On Sat, Feb 2, 2013 at 4:58 PM, Chris Tassone <ctass...@charter.net> wrote:

      Hi Steve,
      My name is Chris Tassone.  I spoke with you at  Strictly Sail Chicago 
concerning the noise I get with my Gori 16.5" x 11 x
2rh prop.  You suggested that tip clearance could be the culprit.  My tip 
clearance is 5-1/2".  I spread the prop by spanning the
blades and hub with a strait edge and measured this distance.  I also measured 
the distance on my 1" shaft from the cutlass to the
front of the prop hub which is 1-3/8".  My boat is a 1979 C&C 34 with a Yanmar 
2QM.  The noise is really noticeable and could be a
concern if I ever try to sell the boat.  Would a smaller prop solve the 
problem?  I installed a new shaft and coupling when I
purchased the Gori.  I lapped the shaft and checked it with a dial indicator.  
The shaft is aligned.  I really appreciate your
attention.
      Thanks,
      Chris Tassone
      231-946-8185 H
      231-883-1234 C



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http://www.cncphotoalbum.com
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