I had a 2 blade Martec folder on my 38, with a Universal M35B (36hp) and HBW100 transmission (1.76 reduction). The recommended prop from Martec based on this engine/transmission and a 15,000 pound boat was a 16x10 ½. I had found a 17x10 for cheap and had it reconditioned for use on the boat, and experienced the same condition you indicate. Max RPM of the engine is 3000, but I could only get 25-2600 from the engine with the 17 prop.
I have since been told that 1 of diameter increases thrust and torque approximately twice as much as 1 of pitch. So the 17x10 is about the same load on the engine as a 16x12, and was considered too much prop for the power available. I have gone back to a 16x10 ½ 2 blade fixed prop for cruising. Mostly because of the improved ability to back the boat. But I also have a 2 blade Gori 16 ½x11 (which is what Gori recommended for the boat) which I may install eventually. Apparently the Gori has less blade area than the Martec, which accounts for the difference in recommended prop. Rick Brass Imzadi -1976 C&C 38 mk1 Washington, NC From: CnC-List [mailto:cnc-list-boun...@cnc-list.com] On Behalf Of Tony Wroblewski Sent: Tuesday, August 13, 2013 8:10 AM To: cnc-list@cnc-list.com Subject: Re: Stus-List C&C 41 re-engine I also have a C&C 41- 1986 with the 3HMF Yanmar but do not need to repower. Why go to the 3JH5? Mine seems satisfactory with the 27HP. My problem however is it doesn't want to develop more than 2800 RPM. Have a Martec 17x10 folding prop. Any suggestions. I have owned the boat since new and it's always been that way. What props do others have on their 41s _____ Date: Sun, 4 Aug 2013 20:21:47 -0400 From: rsh...@optonline.net To: cnc-list@cnc-list.com Subject: Re: Stus-List C&C 41 re-engine Paul, I have a 1984 C&C 41. No, I have not done an engine swap but I would be real interested in the details of the project. Seems that getting the old engine out would be the main concern. Relocating engine mounts should not be a problem. Of course putting the new engine in would be interesting. I am not contemplating an engine swap but I have played "what if" and thought that cutting the cockpit floor out and lifting the engine straight up would solve engine removal issues. With the engine out you would have unrestricted access for fiberglassing, painting, soundproofing and anything else you want to do down there. Good luck, Ray Shibe Stinky Dog. On Sun, Aug 04, 2013 at 07:17 PM, Paul Parsons wrote: I would like to ask the membership if any C&C 41 owners have done an re-engine to the Yanmar 3JH5(39hp), removing a 3HMF(27 hp), has this been done before. Thank you. Paul Sent from my iPad _____ _______________________________________________ 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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