RIG. Folding Rule Method.
New VISION 42
56
Seldén has developed a very simple but efficient way of measuring the correct load applied to a stay.
The correct load applied to V1 & D1 (upper and lower shrouds) should be within 15-20% of the breaking load of the wire
rope.
It is in the nature of stainless wire ropes (we use 1x19 construction for stays) that it stretches. And it is designed to do
so!
For a 1x19 wire it is given that 5% of the breaking load results in a 1mm stretch over a distance of 200cm.
Regardless the wire diameter!
To achieve the min. 15% of the breaking load, the stay has to get stretched by 3mm measured over a 200cm length of
the stay. As sketched right.
In respect to the new Cruiser Range we suggest 20% to stiffen the rig and headstay.
The maximum of 20% is resulting in 4mm stretch over 2m distance – which is relevant for our yachts.
This load application can simply get measured by the use of a Folding Measure taped to the shroud as shown on the
sketch right.
1. Rig unloaded from upper end of swage terminal on the stay upright.
2. Tape and secure the measure at the top end.
3. Tension the stay as described above to the load required (4mm stretch over 200cm distance).
Depending on several facts it might be the case to fine-tune the mast while sailing by turning the slightly deloaded
leeward shroud.
This is a fact to take care for while rigging the boat as usual – tuning the shrouds in the correct way.
Talking about facts: The little sketch is showing the correct way of using the turnbuckles! Please make sure you do turn
the body of the rigging screw the right way – as sketched up!
If you follow this rule, the boat WILL sail very different! You will feel it on the helm while going upwind.
… not to forget the optional hydraulic backstay which allows a quick, easy and pretty efficient trim of the mainsail!
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