I second this regarding 1) what you are looking for and 2) considering a new prop.
I re-propped this spring after my 15 year old 3 blade feathering Max-Prop was facing its second rebuild. Since I was interested in absolutely minimum drag for my club-racing C&C 36 XL/kcb, I investigated this pretty thoroughly. There are several articles in the last couple of years that actually compared this parameter (among others) between different props in drag tests with the prop mounted on a boat. Google will probably find the articles for you. I ended up with the Gori-racing prop after much discussion with experts (Geoff) at AB Marine about prop radius and pitch. This props' drag was the lowest (practically immeasurable), it's geared so it always opens and the pull in reverse is adequate (but a far cry from my Maxprop) for maneuvering into my slip in reverse. Of course, it also had to match the transmission regarding the reduction ratio, which needed to be consistent with the engine power curve, etc. IMHO, there were enough places for an amateur like me to screw up the selection process that it was worth the price of a new prop to be sure I didn't make an expensive mistake. I don't know about longevity yet but I am pleased with its sailing performance and can live with its reverse performance. Charlie Nelson Water Phantom C&C 36 XL/kcb cenel...@aol.com -----Original Message----- From: Bruno Lachance <bruno_lacha...@hotmail.com> To: cnc-list <cnc-list@cnc-list.com> Sent: Wed, Sep 5, 2012 12:59 pm Subject: Re: Stus-List Folding/Feathering Prop for 33-1 It depends of what you are looking for. I wanted to improve the performance of the boat sailing, more power motoring, with good reverse (not being the priority), less vibrations and an easy to maintain long term purchase. After a good look at what is on the market and a lot of reading i decided to go with a 3 blades Flex-o-fold. My boat is a 33 mk II that came with a fixed 2 blades (16"x10RH). The company recomended 15x11 for the 3 blades and i have a lot of power with it (little over 6 knots at 2200 rpm in calm water) so it's economic on fuel too. I did the mistake to cheap on a prop before and bought a martec on e-bay, it was too small and the performance motoring was crap with close to zero power in reverse. Worse summer on the water... Yes buying new is expensive, but you wont regret your choice in the long run. After one season i would recommend my prop to anybody looking for the same compromise, i think it's a good fit for this racer-cruiser type of boat. It's the way i use it. Good luck. Bruno Bécassine 33 mkII 87 > Date: Wed, 5 Sep 2012 12:36:14 -0400 > From: bobmo...@gmail.com > To: cnc-list@cnc-list.com > Subject: Re: Stus-List Folding/Feathering Prop for 33-1 > > Thanks for all the replies. > Ebay has a Martec RH 12 x 10P - 1" Shaft for only $195. > It's right down the road (Green Cove Springs, FL). > I could haul the boat and install it there. > I wonder if the 12" diameter is way too small. > I don't do a lot of motoring, mainly just off and back onto the dock. > > http://www.ebay.com/itm/Martec-Eliptec-Feathering-Folding-Propeller-prop-RH-12-x-10P-1-Shaft-/130755867589?hash=item1e71a833c5&item=130755867589&pt=Boat_Parts_Accessories_Gear&vxp=mtr#ht_838wt_169 > > On Wed, Sep 5, 2012 at 10:12 AM, Rod randow <rod22gstul...@gmail.com> wrote: > > Bob, > > My C&C 33-1 owner's manual (1976) lists props & engines supplied by C&C > > Yachts as > > > > C&C 33 Std Atomic four - gas 16x10x1 2blade (fixed or > > folder) (comes with V-drive 2:1 reduction standard) > > > > I have inquired at boat show about folding props for my boat and I believe > > several companies were recommending something like 15x12. It was awhile ago > > so the pitch may be wrong. I'm still using a fixed 16x10RH. > > > > Rod > > C&C 33-1 > > > > > > On 9/4/2012 8:23 PM, Bob Moriarty wrote: > > > > I've been off the list for awhile as I was considering going to the > > dark (non-C&C - but still sail) side. At any rate Ox and I have > > renewed our vows and I am going to open the ol' checkbook and lavish > > some attention on my 36 year-old beauty . I've already ordered a new > > (used) headsail from Minney's. Now I'm thinking about a > > folding/feathering prop to replace the two-bladed fixed prop I > > currently have. > > If there's a way to search the Stu's-List archives for prop > > info/opinions I will do so. > > > > Ox is in the water year-round so it's not easy to verify some of my > > assumptions. Ox has a rebuilt A4 (for sure, for sure) with a V-drive > > (for sure) and a 2:1 reduction gear (I'm pretty sure) and a > > right-hand drive (prop walk is to port). The prop is a fixed two-blade > > but I have no idea as to it's size or pitch. > > > > Flex-o-fold has my attention as a replacement. I'm not into hardcore > > racing but a 0.5 to 1.0 knot increase would be very satisfying. > > > > Opinions, experiences, and suggestions much appreciated. > > > > Bob Moriarty > > Ox 33-1 > > Jax, FL > > > > _______________________________________________ > > 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 _______________________________________________ his List is provided by the C&C Photo Album ttp://www.cncphotoalbum.com nc-l...@cnc-list.com
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