Tim Dow Conflict Hull 133
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Post by Tim Dow Conflict Hull 133 on Feb 5, 2004 21:31:51 GMT -5
Can anyone give advice for a good prop for the 35??? When I bought this boat, it has a 2 blade...would like to change to a 3 blade to beat against the prevailing SW wind here on Cape Cod. Any experience would be appreciated. noreastermarine@verizon.net THANKS!!!
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Post by Harris on Feb 7, 2004 7:23:39 GMT -5
I found an old email message on this. Also you can search around on the web pages. I have a 3 blade installed on Mikhaya. I still have the old two blade somewhere. Props are a science with the shaft, engine, hull shape and cruising area in consideration. Harris
Greetings, I have an original 14 LH 8 three blade prop on my Westerbeke 30 (Perkins Four-91) with a SAO transmission on my 1978 P-35. At 2,300 rpm, I get 6.4 or 6.5 knots in smooth water. The engine will not turn the prop or itself any faster with the prop engaged. I have reached hull speed of 6.9 knots under sail (full main only in 30 plus knots of wind). Increased wind made no difference in speed. My guess is I could make hull speed under power with a clean bottom. Is this the answer you need?
Ken 1978 P-35 #405 Briganta Cape Cod hesperus@capecod.net
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Post by Tim Dow on Feb 29, 2004 20:59:18 GMT -5
Thanks Ken and all for advice abouth the prop. CONFLICT really struggled under power against the prevailing SW wind here on Cape Cod. Will let you all know how a 3 blade works out. Happy Sailing!! Timmy Dow CONFLICT Hull #133 noreastermarine@verizon.net
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Dan
New Member
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Post by Dan on Dec 2, 2005 22:37:29 GMT -5
I also need advise on a new prop. My 1976 25hp westerbeke has a 14/8 TWO blade LH prop that has never reached hull speed (closer to 4 knots). Harris what is your engine/tranny setup and size of your prop? Thank you for any additional info. Dan.
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Post by windance on Dec 3, 2005 22:46:27 GMT -5
So much depends on the engine/reduction gear combination. I had an A4 with a 2:1 reduction gear swinging a 15x8 3 blade sailor prop. Always felt the boat was under propped. When I installed the new Beta 28 last winter I selected a 2.5:1 reduction gear to allow me to swing a larger diameter prop. The final prop selection turned out to be a 16X11 full profile 3 blade. I now cruise at 6.2 kts @2200 rpm and peak the engine @ 3300 rpm. At 2400 rpm the boat cruises at 6.5 kts. These speeds are cross checked between my GPS and Knot meter. The point of all this is that there is a distinct relationship between prop speed and prop diameter and you have to be able to match your prop to your particular engine and reduction gear. www.boatdiesel.com is an excellent site that will allow you to match a prop to youre engine. It'll cost you $25 for a years subscription. Your other option is to get on Michigan Wheel's website, fill out their questionaire and let them recommend a prop to you. a couple things to remember; a narrow blade sailor prop is prone to cavitation due to excessive blade loading and an increase in diameter, if practical, is good because of the additional projected blade area outside of the turbulent flow from the keel Jack
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Post by Larry on Dec 20, 2005 20:03:08 GMT -5
does anyone out there who has an A 4 straight drive have a sailor prop? If so what size and how do you rate your performance under power and sail? Larry ;Nightwind
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Post by Mark S on Jul 7, 2009 21:25:51 GMT -5
Harris,
What engine powers your three blade? I think I must be the last 35 to be powered by an Atomic 4 because I'm having a great deal of difficulty finding out what 35 owners with A4's are finding to be the best propeller. Right now I have a 2 blade and can get 6 knots but not much more than 1500 RPM. While 6 knots is fine, I'd prefer to get it running the engine a little faster. Lots of people with A4's in other boats like the Indigo 3 blade. I'd like to know what other 35 owners are doing with their A4's before I leap to an Indigo.
Mark S
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Post by hirover on Mar 20, 2011 13:54:23 GMT -5
I've got a Yanmar 3gm30f advertized at 27hp, max rpm 3600, max continuous 3400 according to Yanmar. Had 13x12 conventional 3 blade which seemed to be about ideal for the boat and engine. Recently switched to a Sailor 13x13 that I picked up at a good price. The Sailor prop is way way overpitched. Can only get 2800rpm wide open with lots of smoke and 4knots at 2600 rpm with no smoke. Talked with North by West and they said I'm at least 3 inches and possibly more overpitched. If you are going with a sailor be aware that those skinny blades bite a lot more water than a conventional prop. Will be changing out the prop and repitching the Sailor. Will report the results when I get the prop back on.
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irishbasket
New Member
Location is Galena, MD. They call it a museum piece.
Posts: 9
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Post by irishbasket on Jun 27, 2011 7:06:48 GMT -5
info needed about prop size on 35 with an atomic 4 po put a 3 blade on this boat but i cant seem to back up straight boat crabs to the rite or starboard very bad no amount of rudder adjustment seams to correct or compensate for the prop pulling to rite any one experience this problem an have a remedy art.
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Post by Peter O on Jan 4, 2012 21:08:13 GMT -5
Welcome to the world of the Pearson 35 in reverse. The ony way I can guarantee that I'll back out of the slip in the direction I want to go is have someone stand on the finger pier and push the bow in the right direction. If I don't have anyone do that, just take what the boat gives me and use Prop walk to turn to stbd and get out. In a narrow fairway, it's possible to get stuck sideways. btdt
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Post by jmcleodfl on Aug 16, 2012 10:20:17 GMT -5
I need a new prop for my P35. I've got a Yanmar 3gm30f. A prop guy checked out my current prop and said I had a 1 1/2" prop shaft and the standard prop is a 16 x 12 made for a 1 1/4" shaft. Does this sound right? Can someone tell me how to get a new prop or maybe a reconditioned one? A prior post said thay had success with a 16X11 full profile 3 blade prop. Any suggestions?
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Post by Harris on Aug 19, 2012 5:16:54 GMT -5
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Post by Peter O on Sept 29, 2012 11:57:14 GMT -5
The factory supplied shaft on my '69 boat originally with an Atomic 4 was 7/8". Can't see the need for 1 1/2" shaft on any engine that would fit in the boat. 1" would probably be as large a shaft as you'd need. I'd recheck the diameter of yours.
The 3gm30 came with two different transmission ratios. I've got the lower ratio faster turning transmission and 13x12 is perfect for that gearing. If you've got the higher ratio slower turning box, a larger diameter prop would be better.
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Post by jmcleodfl on Oct 1, 2012 22:43:09 GMT -5
Thanks Peter O, I have a 2.62 gear ratio and found a used 13 x 12 prop. The shaft was seven eights inch. After installing the prop the Sea trial showed full throttle RPM just under 3600. Within the specifications for the 3gm30 Yanmar. I replaced the prop while the boat was in the water. Not an easy task. All the activity on the prop and shaft has now caused the stuffing box to leak The packing nut is completely tight and I probably need to replace the packing. Any suggestions on how to get to the stuffing box. It looks like it would take a trained monkey with 4 arms to get to it.
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Post by jmcleodfl on Oct 8, 2012 19:35:43 GMT -5
Correction the used prop I Installed was a13x13. I managed to get to the stuffing box and was able to tighten it enough to slow the leak down to one or two drops per minute. Check out this website for the correct procedures www.pbase.com/mainecruising/stuffing_box&page=1
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