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Tensioning wire and rod
If you want to trim your rig correctly you should
have some idea of the tension in shrouds and stays,
either by rules of thumb or a more exact method
such as the one described below. Here you measure
the elongation of the wire as a percentage and then
establish tension as a percentage of the wire's or rod's breaking load.
You either measure the longation of all the wire
or a part of it, e.g. 2 m. Accuracy will improve with
the sample length. Begin with a minimum tension
in the wire. Example (cap shrouds):
- Mark off a 2 metre length of the cap shroud on one side of the boat using the shroud terminal for reference.
- Measure the elastic extension (f) of the measured length as the rigging screws are alternately tightened, little by little. Stop when f = 3mm. (4mm on fractional rigs with aft swept spreaders).
Note that an elongation of f = 1mm over a sample
of 2m of the wire corresponds to 5% of breaking load independent of the wire diameter.
NB! For rod, an f = 1mm longation over
2m corresponds to 7.5% of breaking load. |
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