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Old 12-01-2010, 18:26   #1
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Incredible New Prop Braking Mechanism!

Please don't let this out, as there is still a patent pending.

http://www.cruisersforum.com/forums/...cture4361.html
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Old 12-01-2010, 19:03   #2
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Actually this is what Dave the diver removed from my prop shaft. It really underscores the need for periodic maintenance. Although a lot of what you see here is probably from my decks, this can happen from things floating in the water, lobster traps, etc...
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Old 13-01-2010, 06:22   #3
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Found a similar "prop brake" a couple of weeks ago. I always test propulsion dockside before casting off, and the stbd engine wouldn't go above 1400 rpm while in gear......

It's good to find these while dockside
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Old 13-01-2010, 07:36   #4
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Are you sure your not missing a spinnaker sheet?
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Old 13-01-2010, 14:38   #5
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Where did you find my dock line?
regards
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Old 13-01-2010, 19:42   #6
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Quote:
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Where did you find my dock line?
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LOL... Hey, did you install your dock line on my prop?

Seriously, we were out in 10-15 foot seas and 25+ knot winds that day. If a dock like fell in when we were motoring, I had an excuse, albeit one that didn't help things.

Tom
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Old 13-01-2010, 20:07   #7
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I think this one is even more effective:



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Old 13-01-2010, 20:17   #8
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At least it was braking and not breaking.
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Old 13-01-2010, 20:20   #9
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Frank: Yea, no schtic! Could have been a disaster.

Ziggy: I can't compete with that!
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Old 14-01-2010, 04:36   #10
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Fouling the shaft with line can be more than an inconvenience.

There was a boat on the 2001 Caribbean 1500 that wrapped it's own jibsheet around the shaft. The resulting wad of rope between the prop and the cutless bearing forced the shaft back, jammed the rudder hard over, and pulled the engine off it's mounts. This happened about 250 nm SW of Bermuda, in the middle of a gale. The British Navy sent a ship down to help, but it was too rough for divers to remove the rope. They took the crew off and tried to take the boat under tow, but it didn't work out. The boat was abandoned. It was a fairly new Pacific Seacraft 37, if I recall correctly.
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Old 14-01-2010, 04:55   #11
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shaft cutter

That's why I now have a shaft cutter. I had to remove lobster pot warp from my prop several times. I try to avoid them, but it still happens. Having to dive in rough open water to clear the prop is no fun at all.
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Old 14-01-2010, 05:12   #12
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Even with the shaft cutter, my folding prop still managed to collect a lot of rope. See How to catch a fish trap and Rope Cutter
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Old 14-01-2010, 06:03   #13
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Even with the shaft cutter, my folding prop still managed to collect a lot of rope. See How to catch a fish trap and Rope Cutter
I think if it works only half the time, it's still worth it. Also, before I had the shaft cutter, on a few occasions I managed to get the pot warp wrapped around the shaft, but with the lobster trap still attached to it, effectively anchoring the the boat. In your case the rope was cut and at least you were able to sail, even though the engine was temporarily disabled.
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Old 14-01-2010, 06:58   #14
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Ziggy - I agree with you and should have changed the wording on the web page since if the rope cutter hadn't worked my engine would have just died and in both cases, even with lots of rope trailing from the boat, I retained some amount of maneuverability. I haven't checked on the pricing for the little rope cutter on the shaft but it is a worthwhile investment.
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Old 14-01-2010, 09:06   #15
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Quote:
Originally Posted by Zanshin View Post
Even with the shaft cutter, my folding prop still managed to collect a lot of rope. See How to catch a fish trap and Rope Cutter
I can see how a folding prop might not be as effective for a shaft cutter. Seemed to give the rope a place to tangle away from the blade.
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