Author Topic: Propeller 11x13x3  (Read 2966 times)

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SteveNorris

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Propeller 11x13x3
« on: 02 August, 2012, 01:06:09 »
Hi! I broke my prop on my Contest 25 (1969 #259) and am wondering if anyone in the US might have an old one that went with the one cylinder Marstal 6K (original, I think) engine or know if there are any around. It appears to be a 11x13x3 with what appears to be a 20 mm tapered to 17 mm shaft size. 11 is the diameter of the prop as best I can tell, 13 the pitch. I had to change it from my original post because I had the numbers backwards.  Could have one made (big Bucks) but thought I'd throw it out there. Any thoughts? Thanks,
Steve
« Last Edit: 06 August, 2012, 00:10:19 by SteveNorris »

Offline BJ

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Re: Propeller 11x13x3
« Reply #1 on: 02 August, 2012, 10:50:39 »
Are you sure on the diameter because 11 inch is very rare and (in these days) in use with outboards. If you have the space you can try to fit a 12 inch diameter prop, a very common and off-the-shelf size.

SteveNorris

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Re: Propeller 11x13x3
« Reply #2 on: 02 August, 2012, 17:12:30 »
Thanks, I'll double check that diameter. I'm learning about what is possible as a replacement and appreciate your insights.The metric shaft seems a puzzlement but I understand you can get bushings to make other props fit. I haven't delved into the world of prop replacement before but am finding some of the big manufacturers online to see what's out there off the shelf. There seem to be some pretty close matches so I'm hopeful I'll find a good match. I have found a couple of YouTube movies of this engine I have which seem to be looking at the novelty of it. It keeps on going! Simple but reliable so far.

Offline BJ

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Re: Propeller 11x13x3
« Reply #3 on: 02 August, 2012, 17:44:10 »
If a 12" prop fits then you might have a look in the catalog of Vetus. They have a couple of thousand models on stock and I guess they're available in the US as well. Best of all their props are designed for metric shafts saving you the costs of a bushing.
BTW, very cool that you still have the original Marstal engine, by now they are considered museumpieces  :D

SteveNorris

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Re: Propeller 11x13x3
« Reply #4 on: 06 August, 2012, 00:19:15 »
Again thanks for the thoughts on this. I am having no luck here in Maine with anything close to this prop. Some "wow"s and some "good lucks". Another wrinkle is that it is keyless, a feature that has elicited some head scratching and wonderment. I have checked that diameter and it is 11". I'll see what kind of clearance I have for a possible 12 and keep looking for one of those. And I may go to a two blade as I hope to find something so I can get this boat in the water before the Maine season ends in two months!
The Marstal engine is quite a piece of machine. Running well at this point. It has a new exhaust system and some modifications to make it an electric start done by the last owner. It keeps on chugging away. I'll keep you posted. I have inquiries out in Florida and Seattle, Washington. Something will turn up. I couldn't find a Vetus distributor in US yet but am looking into that.

Offline Jaap

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Re: Propeller 11x13x3
« Reply #5 on: 06 August, 2012, 00:26:40 »
don't go for a two blade if your engine is an two cilinder!
you will end up in nasty resonace problems between engine and the two blades; three blades is a must in the case of a two cilinder motor.   

Jaap

SteveNorris

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Re: Propeller 11x13x3
« Reply #6 on: 09 August, 2012, 00:41:40 »
Hi, Engine is a ONE cylinder! Engine is 8 hp Marstal "f" is quite an antique, most were replaced ages ago. I have wondered about change to 2 blade as there are some available. With one cylinder, low RPM (800 max) do you think it would be a problem? Obviously less Prop working in the water, but this engine is not fast anyway.Thanks for thoughts!

Offline BJ

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Re: Propeller 11x13x3
« Reply #7 on: 09 August, 2012, 08:53:52 »
A two blade on a single cylinder is no problem but if you will loose some efficiency if you keed the same diameter. On the other hand, it will also reduce the drag when sailing which is a good thing I would say  ;)

About Vetus in the US, HQ is located in Hanover MD. Also see: http://www.vetus.nl/dealerfinderusa/new_jersey.php
« Last Edit: 09 August, 2012, 08:56:15 by BJ »

 


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