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 _______________________________________________ This List is provided by the C&C Photo Album http://www.cncphotoalbum.com CnC-List@cnc-list.com _______________________________________________ This List is provided by the C&C Photo Album http://www.cncphotoalbum.com CnC-List@cnc-list.com
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