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Chinook Tendons - Safety strap interference.
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mamero



Joined: 25 Aug 2013
Posts: 322
Location: Vancouver, Canada

PostPosted: Fri Jan 26, 2018 12:20 pm    Post subject: Chinook Tendons - Safety strap interference. Reply with quote

I have a couple Chinook US cup Tendons and just ordered one more. Anyone else have issues with the nylon safety straps interfering with the rotation of the joint? There is a rubber o-ring which is meant to keep everything together. The trouble is after just a few sessions the nylon safety straps seem to either shift up in to the the extension area (interfering with the extension pulleys) or, down towards the plate (interfering with the quick release). This affects sail rotation. It's seems once those straps have found their home in the wrong spot it's nearly impossible to get them to stay put in the middle where they should be. Anyway to solve this? It's most noticeable during sail transitions and waterstarts when trying to position the sail around or over the board.


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westender



Joined: 02 Aug 2007
Posts: 1071
Location: Portland / Gorge

PostPosted: Fri Jan 26, 2018 12:49 pm    Post subject: Reply with quote

The strap has to be long enough to not impede the flexing of the joint. Did you have others that were any different? Maybe they're too new.
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nw30



Joined: 21 Dec 2008
Posts: 4834
Location: The eye of the universe, Cen. Cal. coast

PostPosted: Fri Jan 26, 2018 2:10 pm    Post subject: Reply with quote

Cut that big 'O' ring, or slip it off, you don't really need it. I haven't however, because I haven't had that problem you describe. Just don't get your big toe stuck between the tendon and the safety strap.
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manuel



Joined: 08 Oct 2007
Posts: 756

PostPosted: Fri Jan 26, 2018 4:04 pm    Post subject: Reply with quote

Photo or video of the problem?
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joethewindsufa



Joined: 10 Oct 2010
Posts: 995
Location: Montréal

PostPosted: Sat Jan 27, 2018 7:46 am    Post subject: Reply with quote

^+1
NEVER had such an issue and neither did OP with previous ones
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U2U2U2



Joined: 06 Jul 2001
Posts: 4686
Location: Shipsterns Bluff, Tasmania. Colorado

PostPosted: Sat Jan 27, 2018 11:03 am    Post subject: Reply with quote

Never seen that safety strap configuration with a tendon .

Chinook have good customer service , rite them

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joethewindsufa



Joined: 10 Oct 2010
Posts: 995
Location: Montréal

PostPosted: Sat Jan 27, 2018 2:13 pm    Post subject: Reply with quote

well , you may not have seen 'em but they are for sail
(pardon the pun)
big winds:

https://www.bigwinds.com/chinook-windsurf-mast-base-tendon-1-bolt-us-mast-base
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swchandler



Joined: 08 Nov 1993
Posts: 8951

PostPosted: Sat Jan 27, 2018 2:59 pm    Post subject: Reply with quote

I have to wonder why Chinook changed from using line for so many years. However, it's good to know that they are retaining the use of line in their stainless steel universals.

mamero, I have to ask, why not buy the superior stainless universals? While that would require updating your mast extension(s) to the Euro-pin design, you would have superior setup that is far more stout and avoids the shortcomings of the US cup design.

Speaking for myself, I could only get about a year out of the US cup universals before they got wobbly and questionable in my mind. Also, I always had a repeated problem with the spring pins shearing off. Fortunately, it never led to board and rig separation, because the single remaining pin always seemed hold everything together. Of course, you would never want to be foolish enough to use the damaged spring pin component again.
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U2U2U2



Joined: 06 Jul 2001
Posts: 4686
Location: Shipsterns Bluff, Tasmania. Colorado

PostPosted: Sat Jan 27, 2018 5:08 pm    Post subject: Reply with quote

joethewindsufa wrote:
well , you may not have seen 'em but they are for sail
(pardon the pun)
big winds:

https://www.bigwinds.com/chinook-windsurf-mast-base-tendon-1-bolt-us-mast-base


Your provided link is the same tendon type , but not the same base. Irregardless the upper is the same.

The reason I dont pay attention to these,is I have only few USBase attachments, and rarely use a SDM nowadays.

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gregnw44



Joined: 23 Jul 2008
Posts: 742
Location: Seattle, Wa

PostPosted: Sat Jan 27, 2018 7:16 pm    Post subject: Reply with quote

Mamero - I've seen this problem, just as you describe it... on many different brands of U-joints.
But I don't worry about it.
Sometimes "just for looks" I twist the nylon webbing back straight again, so it's lined up with the washers.
And yes, it's sometimes in the way, when attaching the rig... but I never worried about it. I've had U-joints break, and the webbing has saved a huge hassle for me. As long as they're attached, I don't worry if they shift around some.
And yes, I know what you mean, how it can impede the easy swivel of the mastbase.,, between my hands, on the beach.
But again, I don't worry about it... cause it's not going to stop the sail from rotating. There's so much force when flipping a sail around, the slight binding of the webbing isn't going to be noticed (I think).

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