[Rhodes22-list] Chain plates and loos gauge.

[The Rhodes 22 Email List]

The original question about what the maximum load would be on lower shroud
chainplates while in use has morphed into a discussion of how much tension
the rig should be set to when the rig is properly tuned. Those are very
different questions as clearly the tension under rest would be much less
than the tension when heeling in a blow. I want chainplates that would
handle the maximum stress that the rig might face, but I have no intention
to tune  my rig to those excessive pressures.

According to my ancient R22 manual for a standard non-furling mast, the goal
of tuning is to have rig where the mast is perpendicular, straight and where
there is no slack in the jib. The upper shrouds are intended to make the
mast perpendicular while the intent of the lower shrouds are to straighten
the mast once the upper shrouds are adjusted. 

If one over-tightens the upper shrouds, then the tension required to
straighten the mast with the lower shrouds would increase substantially.
So, the question is how much tension should be set on the outer shrouds? My
habit was to have sufficient tension that when heeling the lee shrouds are
not excessively slack and the mast remains relatively perpendicular to the
deck. Every time the upper shrouds are adjusted, the lower ones need to be
adjusted as well so using repeated sea trials in heavy winds to get it right
could be a long and tedious process.

While I would be reluctant to use the tension gauge to set the tension
initially, I think it saves some sea trials to measure the tension on the
upper shrouds once the rig is properly tuned and then use that measure as a
starting point when setting the rig in the future. At least that seems
plausible to me.

Graham 


-----Original Message-----
From: rhodes22-list-bounces at rhodes22.org
[mailto:rhodes22-list-bounces at rhodes22.org] On Behalf Of The Rhodes 22 Email
List
Sent: January-12-15 11:22 AM
To: The Rhodes 22 Email List
Subject: Re: [Rhodes22-list] Chain plates and loos gauge.

Case in point: somebody mentioned the Loos settings recommending 240lbs.  If
you did that for the inner shrouds you'd have a total 960lbs of force on the
cabin top.  Does not sound wise to me and probably cause some cabin top
distortion.

Most of the load should be on the outer stays.  If you're seeing distortion
of the cabin top under sail from the inner stays something is not right in
your rigging.  There's too little tension on the outer stays and/or too much
on the inner ones.

Remember we're talking about the inner stays here...  I remember reading
quite a while back that their primary function was as backup to the outer
stays, so you don't lose the whole rig if a main stay mails.  
Consequently they should probably not have much tension at all.  I couldn't
put a number on it, but I'd say take the slack out and give the turnbuckle
another turn or so and that's all.

--
Cheers!
John Lock
~~~~~~~~~~~~~~~~~~
s/v Pandion - '79 Rhodes 22
Lake Sinclair, GA
~~~~~~~~~~~~~~~~~~


On 2015-01-11 17:40, The Rhodes 22 Email List wrote:
> I won't go into one of my usual rants, but instead urge you people to 
> not apply a loos gauge setting to the R22. It simply does not apply to 
> this craft.  But, if you are still stupid enough to try it, I'm sure 
> the group would love to  hear about the damage you will be repairing.
>   
> Rummy
> __________________________________________________
> To subscribe/unsubscribe go to 
> http://www.rhodes22.org/mailman/listinfo/rhodes22-list
>
> For the list Charter and help with using the mailing list and archives 
> go to http://www.rhodes22.org/list 
> __________________________________________________
>
>


__________________________________________________
To subscribe/unsubscribe go to
http://www.rhodes22.org/mailman/listinfo/rhodes22-list

For the list Charter and help with using the mailing list and archives go to
http://www.rhodes22.org/list
__________________________________________________