Bill
Are those speeds in flat water with no significant current? I can't comment specifically on the Max prop but I have a nominal 30 hp Universal M4-30 diesel engine in my 35 MKII and I use a 3 blade Autoprop, which is self pitching so it chooses for itself what is the proper pitch for a given rpm.at 2400 rpm Alianna cruises at hull speed and is still very quiet without any sound damping materials in the engine room.If I am driving into a strong head wind or heavy seas I will rev her to 2600-3000 to maintain over 6kts but I like steaming at 1600 rpm because it is very quiet and that will drive Alianna at 5 to 5.5 knots into 10-12 kts apparent wind. I really don't have a slow speed unless I shift to neutral because at idle which is set at 1000 rpm she still moves along at about 2.5 kts. I shift the transmission in and out of gear and let her coast a bit to achieve slow speed while approaching a mooring or dock. I have had this setup for 10 years and nothing has changed during that time. Dwight Veinot C&C 35MKII, Alianna Head of St. Margaret's Bay, NS _____ From: CnC-List [mailto:cnc-list-boun...@cnc-list.com] On Behalf Of Josh Muckley via CnC-List Sent: August 15, 2014 2:30 PM To: C&C List; Bill Hoyne Subject: Re: Stus-List Max-Prop settings Oh and resetting the pitch means another haul (more money). Live with it at least till next season's haul. Josh On Aug 15, 2014 12:30 PM, "Bill Hoyne via CnC-List" <cnc-list@cnc-list.com> wrote: Hi All, Here are the results of my Max Prop issues. I have a C&C 35 Mk II with a Volvo Penta 2003 28hp with a 2.4:1 reduction MS2B transmission max RPM is 3200. The prop is a left rotation. The Max Prop is 14" and set to 24 deg (X=C, Y=E). This gives 11.6" pitch. The original settings were way off with wrong settings for any degree and thus the issues. Now I am getting 3000rpm = 6.8-6.9 knots, 2800 rpm = 6.4 knots, 2600rpm = 6.0 knots. How are does this compare with what you guys are seeing? Do you guys thing I can go up to 26 deg and get better speed at some what lower RPM? 3000 rpm is rather loud ( especially if you are motoring for several hours), 26-2700 is much easier on the ears but still loud. (Any ideas on what is best to sound proof the engine compartment?) Cheers, Bill PS I just did my first cruise. An 11 day trip in the Gulf Islands. Lots of fun!! No dents or dings and the boat still floats!! Bill Hoyne Mithrandir '74 C&C35 MkII in Victoria,BC On Jul 28, 2014, at 11:23 AM, Bill Hoyne via CnC-List <cnc-list@cnc-list.com> wrote: I think that will be the plan of attack. On Jul 28, 2014, at 10:24 AM, Martin DeYoung via CnC-List <cnc-list@cnc-list.com> wrote: I agree with Josh on contacting Hutch at PYI to get the best info. Your description of being unable to reach full RPM when in gear does sound like a reduction in pitch is called for. I have changed the pitch on Calypso's MAX Prop several times including the original effort at installation. For a few years I intentionally ran 10% over pitch to reduce cruise speed RPM. Before we went around Vancouver Island (2011) I reduced pitch by one increment to be sure we could achieve full RPM (horsepower) when motoring into bigger waves and higher winds. The reduction to cruise speed (at a smooth engine RPM) was about .2 knot with no measurable change in fuel consumption. The MAX prop owner's manual has the chart that describes the X Y relationship to pitch. I have heard tales of divers willing and able to change the pitch on a classic MAX prop underwater. I would not attempt it myself and in the past set up a deal with a yard to haul and hold in the slings for the change then re-launch. It may take several haul/launch cycles if you want to fully optimize the pitch. Martin Calypso 1971 C&C 43 Seattle <image001.png> From: CnC-List [mailto:cnc-list-boun...@cnc-list.com] On Behalf Of Josh Muckley via CnC-List Sent: Sunday, July 27, 2014 9:22 PM To: C&C List; Bill Hoyne Subject: Re: Stus-List Prop Grease (Now Max-Prop settings) Bill, Contact Fred "Hutch" Hutchinson at PYI. He'll be able to tell you immediately where to start. <mailto:hu...@pyiinc.com> hu...@pyiinc.com Josh Muckley S/V Sea Hawk 1989 C&C 37+ Solomons, MD On Jul 28, 2014 12:16 AM, "Bill Hoyne via CnC-List" < <mailto:cnc-list@cnc-list.com> cnc-list@cnc-list.com> wrote: Hi All, I have a Max Prop of unknown diameter (forgot to measure when I had the boat out of the water). I also have a Volvo Penta 2003 and when I run the engine in idle I get 3000+ RPM,s but when I run it in gear I only get 1900-2000 RPM's. I suspect the pitch is a little high. ( A dripless seal, new shaft and cutless bering were installed last year and in the process the max-prop was taken off and may not have been installed with the original specs of which I don't have from the PO.) My question in does anybody out there know what the X,Y values should be for a typical C&C MKII? I would like a starting point to compare what is in the prop now and where I should head to. The other question is can I do thin in the water or do I need to haul the boat? Thanks, Bill Bill Hoyne Mithrandir '74 C&C35 MkII in Victoria,BC _______________________________________________ This List is provided by the C&C Photo Album Email address: CnC-List@cnc-list.com To change your list preferences, including unsubscribing -- go bottom of page at: http://cnc-list.com/mailman/listinfo/cnc-list_cnc-list.com _______________________________________________ This List is provided by the C&C Photo Album Email address: CnC-List@cnc-list.com To change your list preferences, including unsubscribing -- go bottom of page at: http://cnc-list.com/mailman/listinfo/cnc-list_cnc-list.com _______________________________________________ This List is provided by the C&C Photo Album Email address: CnC-List@cnc-list.com To change your list preferences, including unsubscribing -- go bottom of page at: http://cnc-list.com/mailman/listinfo/cnc-list_cnc-list.com _____ No virus found in this message. 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