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Chinook mast base failure in the waves
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rangerider



Joined: 19 Jul 2009
Posts: 157

PostPosted: Fri Jan 17, 2014 11:25 pm    Post subject: Reply with quote

Recently broke a tendon Chinook base in the Caribbean which earned me a long swim and a ride in a really nice dinghy. I had just inspected the joint before going out - it broke around the pin. Unfortunately I didn't realize that the safety rope was not installed so I had to de-rig the sail in the water and swim in. Lesson for me is that the safety rope/strap should also be inspected each time.
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GURGLETROUSERS



Joined: 30 Dec 2009
Posts: 1363

PostPosted: Sat Jan 18, 2014 4:50 am    Post subject: Reply with quote

The strong criss=crossed rope system around the one piece stainless steel topped Chinook tendon U.J. seems to be the safest fail safe. (Provided you check the knots! Wink )

It probably also is safer to use the tendons with the metal bush inserts for the bolt holes, while still dismantling it regularly to check for splits. It would seem they cover all failure modes with the ropes fastened to the solid stainless tops and bottoms, especially the one piece top and pin.

I still can't fathom how anyone is able to check the inner integrity of a rubber joint, when the interior GLUED inner parts are impossible to see? Also, the safety webbing would be of no help if the threaded top pin snapped, as some are prone to do.

Perhaps some clever folk have X ray eyesight!
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swchandler



Joined: 08 Nov 1993
Posts: 5888

PostPosted: Sat Jan 18, 2014 1:23 pm    Post subject: Reply with quote

When it comes down to it, just look down at a hourglass universal when you're sailing. The amount of deflection between forces is telling. The better tendon-type universals, particularly the Chinook SS one, are a superior product that is more readily serviceable. The extra money for the superior product? Peanuts really, and it's a good example that you get what you pay for.
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manuel



Joined: 08 Oct 2007
Posts: 148

PostPosted: Sat Jan 18, 2014 11:51 pm    Post subject: Reply with quote

The Chinook ss has the same weak strap webbing. It's drilled through and doesn't provide much resistance to the huge lever force on a bent joint.
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GURGLETROUSERS



Joined: 30 Dec 2009
Posts: 1363

PostPosted: Sun Jan 19, 2014 3:22 am    Post subject: Reply with quote

Manual. My two Chinook Stainless steel tendon UJ's both have looped (4 strands) of stout rope criss-crossed through holes in the top and bottom stainless parts, and tied off with knots.

There is no webbing, and the ropes will hold should the tendon fail.
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manuel



Joined: 08 Oct 2007
Posts: 148

PostPosted: Sun Jan 19, 2014 9:06 am    Post subject: Reply with quote

Must have been looking at a different model, the stainless steel one does use the rope.
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