Sam, The original prop was a Michigan Wheel fixed 2 blade, and there was no remarkable change in vibration either way when the Gori was installed. It might have been better, prop mass is more central to the shaft, but it would take some sort of measurement instrument to tell for certain. I have read, and it makes perfect sense, that all else being equal a 3 blade is less prone to vibration, so that is why I was looking. I don't think that I get appreciable vibration from the prop anyway, and whatever there may be is totally swamped out by the one cylinder diesel. (Yanmar YSB12) I did do a careful engine to prop shaft alignment once, which when wrong will cause vibration problems, and I should do it again sometime in mid to late season when the various hull bending stresses have settled down. It is a task best done on a cool day and when in a very patient frame of mind.
I am sure that there must be someone who has done it, but I know of no one who actually has a 3 blade feathering or folding prop on a boat as small as ours. Makes it hard to weigh the advantage of such a costly upgrade. Steve Thomas C&C27 MKIII -----Original Message----- From: CnC-List [mailto:cnc-list-boun...@cnc-list.com]On Behalf Of sam.c.sal...@gmail.com Sent: Tuesday, October 22, 2013 1:44 AM To: cnc-list@cnc-list.com Subject: Re: Stus-List Folding/feathering Props Steve, ...and anyone else - how do you find the 2 blade and vibration? I note you had a concern; was the concern justified or does the 2 blade run OK? Anyone have any experience with 2 blade and 3 blade vibration differences? If anyone is interested, I’ve had a quote back from Max Prop already: Current prop is: 12” x 8” RH 3 Blade Recommendations are: 12” x 10” 2 blade - $1500 12” x 9” 3 blade - $2400 sam :-) C&C 26 Liquorice Ghost Lake Alberta From: Steve Thomas Sent: October 21, 2013 6:18 AM To: cnc-list@cnc-list.com Subject: Re: Stus-List Folding/feathering Props Sam, I found a used geared Gori for my 27 and it works fine in forward and reverse. I had hoped to find a 3 blade folder of some kind to minimise vibration but when I checked the manufacturers specifications there were none available in a small enough diameter. That was a few years ago so it might not be true now. Steve Thomas C&C27 MKIII -----Original Message----- From: CnC-List [mailto:cnc-list-boun...@cnc-list.com]On Behalf Of sam.c.sal...@gmail.com Sent: Monday, October 21, 2013 4:02 AM To: cnc-list@cnc-list.com Subject: Re: Stus-List Folding/feathering Props Good experiences; thanks for sharing. Looks like two or three endorsements for the Max Prop; about the same against the Martec; one for the Flexofold; ...and a Gori replacing a Martec! couple of questions: How big a deal is the maintenance on the Max Prop? Is it just a matter of greasing the prop every couple of years or is there more? - I pull the boat out of the lake every October; so it wouldn't be too much of a concern. I still have the old prop on the shaft. Am I correct in assuming that the taper is a standard SAE? I'm going to need to know for sure before I order. (Probably safer to remove the prop and measure for peace of mind!) Any more information / experiences / insights welcome. sam C&C 26. Liquorice Ghost Lake Alberta On 10/20/2013 7:21 PM, Tim Goodyear wrote: Sam, I have a two blade Flex I Fold, which goes nicely forwards and backwards and replaced a 2 blade non-geared Martec that went sideways in reverse and sometimes went forward if the blades opened together (even after rebuilding). The two do not compare. Tim Mojito C&C 35-3 Branford, CT On Oct 20, 2013, at 7:10 PM, David Donnelly <da...@gnuattitude.ca> wrote: Sam I also have the 2 blade Martec and a 26. I have not found poor performance in reverse but I don't do it a bunch either. Can push just fine going forward. David Sent from Samsung Mobile -------- Original message -------- From: Harry Hallgring <hhallgr...@icloud.com> Date: 10-20-2013 5:00 PM (GMT-07:00) To: cnc-list@cnc-list.com Subject: Re: Stus-List Folding/feathering Props Sam, I have a two blade folding Martec prop that goes 7 kts forward and four kts directly sideways in reverse. Going with a Gori this winter. Harry Sent from my iPhone 6Beta On Oct 19, 2013, at 20:21, Sam Salter <sam.c.sal...@gmail.com> wrote: This winters project is a folding/feathering prop. I've just sent off inquiries to: Flexofold Max Prop Slipstream Anyone got any comments/observations/likes/dislikes. Any experience good or bad with any type of folding/feathering prop would be useful. Any other manufacturers recommended. Now is your chance to get in on a real sailing topic - folding/feathering props OR rum! sam :-) C&C 26 Liquorice Ghost Lake Alberta _______________________________________________ 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 _______________________________________________ This List is provided by the C&C Photo Album http://www.cncphotoalbum.com CnC-List@cnc-list.com
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