Hi Eric,
When I broke a blade on my 2-blade fixed prop, I bought a Gori 2-blade 16.5x11
RH for My 1979 C&C 34. I bought a new shaft, coupling and cutlass to
complement the Gori. From 3 to 5 knots I get a lot of noise/vibration. At 6
knots it is better but still noticeable. After haulout I spoke with Geoff at
AB and they finally agreed to rebalance it. I put it back on an there was no
improvement. I saw Steve from AB at the Strictly Sail Chicago show last month
and he questioned my tip clearance. I measured it at 5" from the hull.
Steve's response was to have it rebalanced again. At this point I can't live
with this prop and am considering going back to a fixed blade. I spoke to the
people at Flexo-Fold and they believe the problem is the rectangular shape of
the Gori blades. They could be right but I'm a little gun shy regarding
folding props.
Chris
----- Original Message -----
From: Eric Baumes
To: cnc-list@cnc-list.com
Sent: Monday, February 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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