Im a bit surprised at the recommendation from Flex-o-fold. Seems like a lot of prop for a boat that is essentially 30 ft with a 15 HP engine.
For perspective, a friends J/30 with an 18HP Yanmar has a 12x9 Martec. The Gori for my C&C 38 with a 36 HP Universal @3000 RPM is a 16x10, and the Martec recommendation was 16x10 ½. Suggest you contact Flex=o=fold and discuss the recommendation with them. They may have made a mistake in one of the inputs for the recommendation. For example, the reduction gear: A prop for a 2:1 reduction gear would have more pitch than one for a 1.5:1 reduction. IIRC there are more than 1 reduction gears available on the Yanmar engines. I would also contact Campbell, MaxProp, and Gori to see what they recommend. Rick Brass From: CnC-List [mailto:cnc-list-boun...@cnc-list.com] On Behalf Of Martin Kane Sent: Wednesday, January 15, 2014 10:01 AM To: cnc-list@cnc-list.com Subject: Stus-List Prop Size C&C 29-2 Id like to tap into the collective experience of C&C 29-2 and/or Yanmar 2GM (15hp @3600) owners. My 29-2 , acquired 3 years ago, had a 15x9 3 blade fixed prop installed and 15x10 2 blade Gori spare. This was my first diesel engine and initially I was quite pleased when I could reach 5knts at about 1800 +/- rpm and would top out around 2200 rpm. After learning more about diesels I realized the boat was overpropped. The next season I installed the 15x10 Gori and the overpropping is worse black smoke starting around 2100rpm and reduced ability to push thru wind/waves. The Yanmar tach shows 3600 max rpm in neutral and also matches the reading on a laser tach at 2000rpm. Im looking for a new prop and am considering a Campbell Sailor, 2 blade Flexofold, or 2 blade Max Prop. On the basis of the current performance and C&C owners manual I was thinking that a correctly sized 2 blade prop would be 14 diameter and 8 or 9 pitch. I submitted a sizing/quote request to Flexofold and they recommended a 15x11 which was not what I was expecting. Id be grateful to hear what type/size props other listers have on their 29-2s or Yanmar 2GM-15s and how satisfied they are. Martin C&C 29-2 Recalculating Mimico Cruising Club
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