Tendon Mast Base + Euro Style Pin = Trouble

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> 10 years ago

General Gps & Speed Waves Foiling Gear Reviews Lost & Found WA NSW QLD SA VIC TAS

nebbian

6277 posts

nebbian

WA, 6277 posts

19 Dec 2009 10:53pm

Twice I've had a little button break off the spring clip inside a chinook cup, both times I discovered it while derigging -- the other button was holding the rig on

I quite like the idea of having to have two bits fail in the same session before you lose the rig

Mark _australia

23647 posts

Mark _australia

WA, 23647 posts

20 Dec 2009 11:05am

NotWal, they are now a socket head capscrew that looks fatter M5 vs M4 (?) but having said that, I never broke the old ones. I've had 10 y/0 ones I refurbushed and the bolts thru the tendons may have been bend a little but never broken. I think the thin stainless sleeve in the tendon helps a lot.

Nebbs, I had the same thing with cups all the time and that is why I changed away from them. Pretty scary when you've had a big big sesh and come in to find one of the button sheared off the spring clip thingo

Haircut

QLD

6491 posts

Haircut

QLD, 6491 posts

21 Dec 2009 10:19am

nebbian said...

I quite like the idea of having to have two bits fail in the same session before you lose the rig

i sailed for a year on one button after the other broke off, then when the second broke i poked a piece of rope through the hole and sailed the rest of the day

the person who invented the chinook cup deserves a good shag

sailquik

VIC

6171 posts

sailquik

VIC, 6171 posts

22 Dec 2009 12:06am

I have sailed only Euro pins now for many years. I only use Bodge rubber PJ's. Can't stand the tendon things, too long and stiff and I don't trust them.
I don't do much wave sailing these days but I do sail a lot of hours. I have only broken one pin and it was on the first sail on a brand new one. Careful examination after revealed that the pin had been done up too tight into the PJ, twisting the threaded part and and fatiguing the metal. It was already broken part way through. Now I buy the parts separately and put them together myself. No more issues. :-)
Food for thought though.... some sort of easy fitted and released safety rope/strap between the board and the rig would be a good idea for any type of base.......

Mark _australia

23647 posts

Mark _australia

WA, 23647 posts

22 Dec 2009 12:00am

(1) Boge joint: if the rubber breaks, how do u know the nylon safety strap is intact? A lot of it is hidden where it wrapsaround the top and bottom of the rubber hourglass thing
At least with a tendon, the safety system is a downhaul rope you can see

(2) Roger, your example of a broken off pin can't happen with the Chinook system, as I said above the pin and the cup the tendon goes into are one peice.

(3) strap between board and rig? the Chinook europin base is ideal. The onlything that can break is the tendon. Theyare obvious when they are about to break (as a poster above said)..... at any rate replace the tendon every 2 yrs and you're fine! If tendon breaks, the failsafe is a piece of downhaul rope that is a strong as you'll find.

NotWal

QLD

7436 posts

NotWal

QLD, 7436 posts

22 Dec 2009 12:07pm

Mark _australia said...

(1) Boge joint: if the rubber breaks, how do u know the nylon safety strap is intact? A lot of it is hidden where it wrapsaround the top and bottom of the rubber hourglass thing
At least with a tendon, the safety system is a downhaul rope you can see

I had a boge failure a little while ago. It was I believe typical. It wasn't the rubber that failed but the nut moulded into the rubber. It was some metal different from the stainless pin that screwed into it so it corroded and there was no way to see what was going on until it failed. The webbing strap doesn't do anything when that happens but with a slight redesign it could help.

That's two examples of design incompetence in one product.

I like the rubber joint because it is more flexible than the tendon and I suspect it absorbs shock a bit better.

Does anyone know of a decent brand with sensible functional design?

busterwa

3782 posts

busterwa

3782 posts

22 Dec 2009 10:26am

I use the cup style now because my mast detached in swell and it too a while and was awfully awkword to get kit back together.
I wont ever use this pin style again.

NotWal

QLD

7436 posts

NotWal

QLD, 7436 posts

22 Dec 2009 4:04pm

busterwa said...

I use the cup style now because my mast detached in swell and it too a while and was awfully awkword to get kit back together.
I wont ever use this pin style again.

They are all pretty difficult to reinsert on the water, except mechanical u/js. Mechanical u/js have a lot going for them but very few people use them.

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