Cal 35 MKII with Campbell Sailor - SailNet Community
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post #1 of 15 Old 10-01-2013 Thread Starter
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Cal 35 MKII with Campbell Sailor

I own a 1983 Cal 35 MkII (new to me) and have been getting her into shape. Anyone have any experience with moving to a 3 blade prop? I had a 17-10 on my Cal and expect that was what it came with. I recently purchased a Campbell Sailor 16-8 and it is looking like it is way to much prop. Stern drops dramatically, Universal 5432 will only rev to 2000rpm under load. WbyN are more than willing to send me smaller prop. Any feedback much appreciated. To get RPM's where expected I would have to move to a 15-8 3 blade Mike
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post #2 of 15 Old 10-01-2013
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Re: Cal 35 MKII with Campbell Sailor

From everything I've heard about the Campbell Sailer folks I'd just take their advice about what prop size and pitch and let them send it to me.

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36' Solaris Sunstar catamaran
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post #3 of 15 Old 10-02-2013 Thread Starter
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Re: Cal 35 MKII with Campbell Sailor

Thanks and agree, and did that. The prop is based on standard and typical configuration. West by North is great to work with and while it is typical they have some instances where things did not work out as typical. Right now I am eliminating any other variables (which are few) to determine if it is the prop. Inability to rev past 2000 and stern drop are the big indicators. Good news is West by North has great customer focus and are willing to work through the issue with me.
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post #4 of 15 Old 10-02-2013
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Re: Cal 35 MKII with Campbell Sailor

Years back we removed a 18x16 martec, W by N specc'd a 17 x 11 Campbell - quite a change. It worked great.

Ron

1984 Fast/Nicholson 345 "FastForward"

".. there is much you could do at sea with common sense.. and very little you could do without it.."
Capt G E Ericson (from "The Cruel Sea" by Nicholas Monsarrat)
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post #5 of 15 Old 10-02-2013 Thread Starter
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Re: Cal 35 MKII with Campbell Sailor

Thanks for the additional info. I went from 2-Blade 17x10 to 3-Blade CS 16x8. Not as much pitch drop as you but thought to be a good fit based on past jobs and my set up with motor and tranny. My first question was if by chance the wrong prop went out the door. A long shot as W by N is so good. Anyway, interestingly they have a few (3-4) set ups that required a 15x8 to reach engine rpm. My big question before chasing a prop issue that may not be an issue is what else could be the problem. Obvious items like cable linkage, etc. is fine. Motor will rev to 2800 redline without load. When maxed at 2000 under load no black smoke or strain or overheat on diesel. I have not done a compression check yet or pulled injectors but trying to avoid that. And the big item is the stern dropping. The Cal 35 sits pretty high in the back and for the muffler to go to water line is being caused by some significant thrust. Thanks again for feedback.
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post #6 of 15 Old 02-13-2014
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Re: Cal 35 MKII with Campbell Sailor

just bought a cal 35 1982 there was no prop when I investigated I would only be able to fit about a 14" I think the shaft is too short does your prop go jut behind the strut or is there space between this one has no space if shaft was longer I would be able to swing 16" really would like to know dimension from end of shaft to rudder any pic would help also really in a bind want to do it rite, any help very appreciated thx cliff
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post #7 of 15 Old 02-14-2014 Thread Starter
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Re: Cal 35 MKII with Campbell Sailor

Cliffs508: that does not sound right only being able to fit a 14" diameter prop. My Cal 35 MkII (1983) original prop was a 17" 10 pitch RH and my current Campbell Sailor is a 16" 8 pitch ( i am actually getting it reworked now to a 15/8). I can assure you both had enough clearance. I have attached a picture of my strut/shaft but do not have dimensions. We have heavy snow here in Baltimore so I will be going down to the marina to check on things and will grab a measurement from strut end to the end as well as distance between rudder and shaft end. I will also grab some strut dimensions. Is it possible your strut was modified? That certainly would have caused the shaft angle to be modified.
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post #8 of 15 Old 02-14-2014
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Re: Cal 35 MKII with Campbell Sailor

thx really appreciate your help I bought the bought as a project boat so I am not overly excited about finding this problem a few things are possible strut put back in wrong place I doubt that shaft alignment is good, there seems to be excessive feathering around the strut why I have no clue, I have talked to prop guy who told me he would leave it all alone and go with a 13-12 prop which will work fine my problem is I would rather be sure about dimensions and fix it rite now not later so I can not tell you how excited I am that you can do that I am in no real hurry there is plenty to do I hope to get in the water april im in so florida thx
cliff
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post #9 of 15 Old 02-16-2014
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Re: Cal 35 MKII with Campbell Sailor

If you want a technical reference Dave Gerr's Propeller Handbook is the best I've come across. As I understand it prop diameter and number of blades are to get enough blade surface area so that your engine can deliver its power without cavitation. In general the largest blade diameter that gives you sufficient blade tip clearance from the hull is the most efficient. If a two blade doesn't give you enough blade area you go to three.
If you're not getting full power RPMs your prop has too much pitch.
Having said all that, my opinion is that the technical analysis assumes that your boat is traveling in flat water. Adding wind and waves to what the engine is pushing against favors more blade area e.g. three blade. BTW I have a Campbell. There's a MIT tank test on prop drag resistance that show it to be a good choice for sailboats.

Walt Elliott
Kingston WA
Puget Sound
Cal-29
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post #10 of 15 Old 02-17-2014
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Re: Cal 35 MKII with Campbell Sailor

thk app the advice
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