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Old 26-08-2015, 13:21   #76
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Re: My prop fell off... f.ck f.ck f.ck.

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Originally Posted by wsailing1 View Post
Funny, I installed a 2 blade flex-o-fold 2 months ago, following the directions explicitly and mine fell off after 30 days. We had a lot of vibration from the beginning, which I contacted the manufacture and the Annapolis dealer about. The dealer said they had a lot of problems with them. The manufacturer said the prop was factory tested before shipping and was perfectly true, but they also sent some wrong parts which had to be reordered. We did not find the prop as it came off in a 30' deep badly silted river. The diver said the silt was 6' deep at least. We did not have any vibration before this prop was installed.
Ouch..... Mine lasted 5 years and yes I was extremely lucky to find it
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Old 26-08-2015, 13:26   #77
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Re: My prop fell off... f.ck f.ck f.ck.

Had a new engine installed by a little firm run by Aussies in Phuket, Thailand. Should have got my head around it, so partly my fault for not paying attention to the new prop shaft they installed, but there was nothing to keep the prop nut on, no cotter pin, no key, no lock nut, nothing. So she came off turning into a gale off NW Borneo. Took forever to get a suitable replacement in Kudat.

Oh, and I never found mine :-)
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Old 26-08-2015, 13:26   #78
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Re: My prop fell off... f.ck f.ck f.ck.

FYI (and I should have mentioned this before, I guess)- French boats use a different fail-safe system to secure fixed blade props than anybody else. As Hoppy has discovered I'm sure, in the French system, the prop goes on over the key, then a special washer goes on the shaft. The washer has a tang that fits into the keyway on the prop. Then the prop nut (which is a cone nut that accepts the prop anode) is installed. Once the nut has been torqued, you bend an edge of the washer up over one of the flat surfaces of the prop nut. This secures the prop and nut to the shaft. There is no cotter pin in this arrangement nor is it possible to use one, as the prop nut covers the entire end of the shaft and has no holes to allow a cotter pin to pass through.

This setup is a real PITA, IMHO, but I guess the French have gotta be different.
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Old 26-08-2015, 13:32   #79
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Re: My prop fell off... f.ck f.ck f.ck.

Actually, what you describe is the way a lot of automobile wheels axle nut is held on, works very well, just have a spare "special" washer
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Old 26-08-2015, 13:32   #80
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Re: My prop fell off... f.ck f.ck f.ck.

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thanks for all of the suggestions and encouragement. I think I might have gone mad with worry if I wasn't occupied with the thread.

Hoppy, really glad to hear you are tied up snuggly!
Well done with the installation of the old prop.

SWL
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Old 26-08-2015, 14:05   #81
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Re: My prop fell off... f.ck f.ck f.ck.

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Originally Posted by fstbttms View Post
FYI (and I should have mentioned this before, I guess)- French boats use a different fail-safe system to secure fixed blade props than anybody else. As Hoppy has discovered I'm sure, in the French system, the prop goes on over the key, then a special washer goes on the shaft. The washer has a tang that fits into the keyway on the prop. Then the prop nut (which is a cone nut that accepts the prop anode) is installed. Once the nut has been torqued, you bend an edge of the washer up over one of the flat surfaces of the prop nut. This secures the prop and nut to the shaft. There is no cotter pin in this arrangement nor is it possible to use one, as the prop nut covers the entire end of the shaft and has no holes to allow a cotter pin to pass through.

This setup is a real PITA, IMHO, but I guess the French have gotta be different.
Ahhh, so that's how it works. My washer was used with the prop before I fitted the flexofold and I think was perfectly flat with no sign of ever been previously being bent.
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Old 26-08-2015, 14:40   #82
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Re: My prop fell off... f.ck f.ck f.ck.

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Hoppy, you deserve a beer! Or three!

Very glad you & your boat are safe!

So dead tired that I was more happy to celebrate with a cup of tea


Sent from my iPhone using Cruisers Sailing Forum
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Old 26-08-2015, 15:10   #83
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Re: My prop fell off... f.ck f.ck f.ck.

raft up your dink midships, fore and aft, nearly as good as an inboard
Bill
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Old 26-08-2015, 16:53   #84
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Re: My prop fell off... f.ck f.ck f.ck.

The most important thing is, that the taper of the shaft matches exactly with the taper of the prop. Otherwise it works loose due to small movements of the prop on the shaft. This has nothing to do with the key. The key is not intented to take up the torque forces.

Most of the time the propshaft is made by another firm then the firm supplying the prop. You must carefully check if the tapers match with a blue dye layer or with a grinding paste.
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Old 26-08-2015, 17:04   #85
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Re: My prop fell off... f.ck f.ck f.ck.

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Most of the time the propshaft is made by another firm then the firm supplying the prop. You must carefully check if the tapers match with a blue dye layer or with a grinding paste.
I tried that once. It could take years to get a perfect fit with valve grinding paste. Might be why we have big nuts and keys.
Speaking of big nuts, which one goes on first, the thin one or the thick one?
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Old 26-08-2015, 17:19   #86
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Re: My prop fell off... f.ck f.ck f.ck.

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Speaking of big nuts, which one goes on first, the thin one or the thick one?
Thin one (jam nut) first, big one (king nut) second.
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Old 26-08-2015, 17:24   #87
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Re: My prop fell off... f.ck f.ck f.ck.

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Thin one (jam nut) first, big one (king nut) second.
Correct, often done backwards, thinking the jam nut holds the big nut in place.
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Old 26-08-2015, 17:33   #88
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Re: My prop fell off... f.ck f.ck f.ck.

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I tried that once. It could take years to get a perfect fit with valve grinding paste. Might be why we have big nuts and keys.
Speaking of big nuts, which one goes on first, the thin one or the thick one?
No, that is not the way to do a proper mounting.

It is the good fit of the tapers that takes up the load. Of course, if the tapers are different you cannot easily make them fit with a grinding paste. But with a grinding paste or the blue dye, you can see where the problem is. And then the taper has to be changed on a lathe.
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Old 26-08-2015, 18:23   #89
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Re: My prop fell off... f.ck f.ck f.ck.

Rum all around....
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Old 26-08-2015, 18:34   #90
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Re: My prop fell off... f.ck f.ck f.ck.

REad this all the way thru. Congrats Hoppy good job. Sailing singlehanded when something like that happens is a bit of a nightmare but you did well. Cheers.
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