Tendon joint inspection

Tendon joint inspection

Post by LUK4WI » Thu, 28 May 1998 04:00:00


How do signs of wear show up on tendon joints?  With *** U joints I usually
noticed cracks or slits in the ***. On the orange streamline joints does
wear show up as lighter colourations? Like the creases that occur when bending
a sheet of plastic back and forth. Do permanent bends in the joint mean it will
fail soon?  What methods do you use to inspect tendon joints?

--------------------------------------------------------------------------
-------------------------

LUK4WIND & CHASE IT
PLEASE NO SPAM

 
 
 

Tendon joint inspection

Post by NLW TFW » Thu, 28 May 1998 04:00:00

I've been told -- and have read -- that they fail at their ends, near their
***holes, which are hidden by the metal collar at each end. The problem is
that the early warnings are virtually invisible, nearly microscopic cracks, so
visual inspection can give false comfort.

Since my last joint failure cost me a 2-hour swim and a board, I think regular
uni replacement is CHEEP, CHEEP, CHEEP.

Mike \m/
Never Leave Wind To Find Wind

 
 
 

Tendon joint inspection

Post by LUK4WI » Fri, 29 May 1998 04:00:00

Quote:
>Mike \m/
wrote
>Since my last joint failure cost me a 2-hour swim and a board, I think regular
>uni replacement is CHEEP, CHEEP, CHEEP.

  How often (days of sailing)  do you think tendon  joints should be replaced?
In a year I probably get about 200 days of sailing in various conditions.

--------------------------------------------------------------------------
-------------------------

LUK4WIND & CHASE IT
PLEASE NO SPAM

 
 
 

Tendon joint inspection

Post by JohnMi » Fri, 29 May 1998 04:00:00

Also check the small nuts  with plastic locking inserts that hold the
tendon to the cup and base.I have a Chinook base where the top nut
has come loose causing the bolt to fall out.
This has never happened with similar Streamlined bases I have.

 
 
 

Tendon joint inspection

Post by MTVNewsG » Fri, 29 May 1998 04:00:00

I experienced a Streamlined tendon failure when the***attaching the tendon
to the base piece broke.  That uni was 3.5 years old.

Mike...where were you that you had to swim for two hours, and what was that
like (and did you have your vest on)?

Luk...if I got 200 days in one year, I'd replace the uni every year.  That's
something like 35 cents per day for a healthy universal if you replace the
entire unit...if you just have a new tendon put in, it's even less.

-Michael
 US5613
Michael
US5613

 
 
 

Tendon joint inspection

Post by NLW TFW » Fri, 29 May 1998 04:00:00

Re:"Mike...where were you that you had to swim for two hours, and what was that
like (and did you have your vest on)?"

Michael --
That was at a 40x2-mile lake in NM a couple of weeks ago, in side-off winds.
The 100-mile-long downwind shoreline is totally isolated, requiring many miles
of hiking  and a swim across the narrows to reach the nearest sign of man. And,
yes, I had a snug 11-pounds-flotation vest on. Without it, those two hours of
swimming could have been life-threatening, as the 3 to 4 foot chop/swell was
breaking over my face occasionally in a full 4/3 suit and the vest. For
details, look back 8-10 days at "Jeez -- 'Nuther LOOOONG Swim".

Mike \m/
Never Leave Wind To Find Wind

 
 
 

Tendon joint inspection

Post by NLW TFW » Fri, 29 May 1998 04:00:00

Re:"Mike \m/ -- How often (days of sailing)  do you think tendon  joints should
be replaced? In a year I probably get about 200 days of sailing in various
conditions."

I don't know. But since $30/200 days = 15 cents a day, I'd sure as heck chuck
my unis anually unless all my sailing was at Morgan Lake (onshore winds, sandy
shores, 80-degree water). Heck, I'd still do it. Who wants to miss an hour of
30 knots to save $30? And who always sails in a womb?

Mike \m/
Never Leave Wind To Find Wind

 
 
 

Tendon joint inspection

Post by Roger Nightingal » Fri, 29 May 1998 04:00:00

I'll second that. We sail a barrier island inlet on outgoing tides, so I replace
mine every 2 years. And after a recent bad expeience with my booms, I'll be
replacnig those every three years.

I want Luk's job

Quote:

> Luk...if I got 200 days in one year, I'd replace the uni every year.  That's
> something like 35 cents per day for a healthy universal if you replace the
> entire unit...if you just have a new tendon put in, it's even less.

> -Michael
>  US5613
> Michael
> US5613

--
Roger Nightingale
Duke University
Department of Biomedical Engineering
 
 
 

Tendon joint inspection

Post by Martin Stewar » Sat, 30 May 1998 04:00:00

Does anyone have any experience of F2 boge type UJ's failing?
I have been using one for about 6 months, since the BIC type
tendon joint (similar to North Pin?) kept failing in waves on me.

Most alarming.

Martin.

 
 
 

Tendon joint inspection

Post by Michael J. Winkle » Sun, 31 May 1998 04:00:00

One point missed here about tendons is that some board makers don't
recommend them (I'm not naming names). They don't give the shock absorbstion
like the traditional *** uni's do and put more stress on the board.