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Go Back   SailNet Community > On Board > Gear & Maintenance > 3-blade fixed prop recommendations?
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Thread: 3-blade fixed prop recommendations? Reply to Thread
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Topic Review (Newest First)
09-29-2012 09:02 PM
rikhall
Re: 3-blade fixed prop recommendations?

Quote:
Originally Posted by Maine Sail View Post
To free it I just give a quick blast of revers and it's gone. I would think we'd get more with a fin keel but perhaps not...
We have a "fin keel" on our Irwin Citation 34 and we bought and installed a Campbell Sailor this past spring and used it this summer.

Our old Michigan three blade (I called it a "tug boat prop") was a major weed magnet and nothing would get the weeds off except going for a swim.

Like Maine Sail says - a quick bit of reverse (usually) takes the weeds off the new Campbell Sailor. Two times this summer, once off Petit Manan and once just off The Wolves in the Bay of Fundy it took a quick swim to get them off.

So, I happily add my recommendation for the Campbell Sailor prop.

Rik
09-29-2012 07:41 PM
preservedkillick
Re: 3-blade fixed prop recommendations?

Quote:
Originally Posted by DoubleEnder View Post
You could possibly cut or have machined a zinc to be narrower.
I used to do this with my old setup. I'd buy the thinnest ring-type shaft zinc and just grind it down myself with a bench grinder. Took about a half hour, but it worked well.
09-29-2012 10:00 AM
DoubleEnder
Re: 3-blade fixed prop recommendations?

Quote:
Originally Posted by Catboatfan View Post
I've only got about 1/2 or 3/4 inch space there-not enough for a zinc.
You could possibly cut or have machined a zinc to be narrower.
09-29-2012 04:25 AM
Catboatfan
Re: 3-blade fixed prop recommendations?

I've only got about 1/2 or 3/4 inch space there-not enough for a zinc.
09-28-2012 06:11 PM
preservedkillick
Re: 3-blade fixed prop recommendations?

Catboat fan,

How close to the bearing is the front edge of your prop hub?

I agree, I'm going to dive next time I go to the boat and add a shaft zinc.

-pk
09-28-2012 04:44 PM
Catboatfan
Re: 3-blade fixed prop recommendations?

I see you have an external bearing support, thus the prop is much farther away from the deadwood; on my boat it's very close to the deadwood as the cutless bearing is pressed into the deadwood itself. In fact, there's no room for a zinc ahead of my prop; I use a "doughnut" zinc clamped to the propeller nut. You might try a doughnut zinc ahead of the prop and see if it helps.
09-28-2012 01:38 PM
Maine Sail
Re: 3-blade fixed prop recommendations?

Quote:
Originally Posted by preservedkillick View Post
This is exactly what I experience, except it happens all the time! I often end up getting in the dinghy at the end of the day to pull seaweed from the prop.

I wonder why my setup is such a seaweed magnet?



Could it be the gap between the and of the bearing and the start of the prop?? Perhaps I should try a shaft zinc in front of the prop to take up the space. ?
That's odd. This summer it happened just twice to us but I never noticed any difference in frequency between the CS and our old prop.. We had a LOT of weed this summer too. To free it I just give a quick blast of revers and it's gone. I would think we'd get more with a fin keel but perhaps not...
09-28-2012 01:31 PM
preservedkillick
Re: 3-blade fixed prop recommendations?

Quote:
Originally Posted by Catboatfan View Post
It's been a long time since I sailed in Maine-unfortunately-so I can't remember what kind of seaweed you encounter up there. Here on the outer Cape, we have quite a bit of a type of seaweed which looks like big clumps of sawgrass floating just below the surface; only once have I had a problem with it. Not long after I first installed the new prop, I was running from the mooring to the town dock and suddenly all hell broke loose; all kinds of vibration and noise, and the boat slowed down to a crawl. Of course the first thing I thought of was the prop was coming off, the shaft was bent, etc. etc.
This is exactly what I experience, except it happens all the time! I often end up getting in the dinghy at the end of the day to pull seaweed from the prop.

I wonder why my setup is such a seaweed magnet?



Could it be the gap between the and of the bearing and the start of the prop?? Perhaps I should try a shaft zinc in front of the prop to take up the space. ?
09-28-2012 04:17 AM
Catboatfan
Re: 3-blade fixed prop recommendations?

It's been a long time since I sailed in Maine-unfortunately-so I can't remember what kind of seaweed you encounter up there. Here on the outer Cape, we have quite a bit of a type of seaweed which looks like big clumps of sawgrass floating just below the surface; only once have I had a problem with it. Not long after I first installed the new prop, I was running from the mooring to the town dock and suddenly all hell broke loose; all kinds of vibration and noise, and the boat slowed down to a crawl. Of course the first thing I thought of was the prop was coming off, the shaft was bent, etc. etc. I went to neutral and looked over the transom, and saw a huge bunch of this weed trailing from the screw. I reversed a couple of times and it came off. Knock on wood, hasn't happened again. I can't say that this wheel is more susceptible to fouling than what I had before-the only thing that ever fouled my 2-blade was a length of 5/8" nylon line, leading to my first working experience with a scuba tank! I should note that my prop is also in an aperture, cut into the deadwood ahead of my barn door-style rudder.
09-27-2012 09:55 PM
Waltthesalt
Re: 3-blade fixed prop recommendations?

I'm doing a gasoline to diesel repower and am working on the same issue. I think what matters in performance is having the correct pitch/diameter/blade area combination. If you want to get into this the ultimate reference for us amatures is Gerr's "Propeller Handbook". Besides all the basic info it gives the info so you can make your own calculations. I went to Michigan Wheel and they entered thier data into thier computer and were failly close in pitch however thier blade area was too low for the cavitation curve calculations so it was good to have done them. You may find the book at the library.
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