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Adjusting the cap shrouds
Tensioning wire and rod
If you want to trim the 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 of the chosen start lenght 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 = 1 mm 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.
- Tensioning the cap shrouds
- Ajusting the cap shrouds
- How to adjust the cap shrouds
- How to tension the cap shrouds
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