Fractional rig, one set of swept spreaders, single aft lower shrouds, deck-stepped mast

At the crane In general, this type of rig needs more tension in the shrouds than a rig with in-line spreaders. The tension in the forestay is affected by three components; 1. The cap shrouds 2. The backstay 3. The sheeting of the mainsail
Cap shroud max 25% • Read the “At the crane” section on pages 20-21.• Lift the mast and place it on the T-base. • Attach the cap shrouds, backstay, and forestay. • Tighten the cap shrouds, forestay and backstay tempo-rarily so that the mast is stayed both laterally and longi-tudinally. • Lower the lifting strop and remove it. Attach the lower shrouds. Move the yacht away from the crane.
Backstay max 20% Tuning • Check the mast rake. Adjust if necessary using toggles on the forestay.• Tension the cap shrouds to 15% of the breaking load of the wire. See the “folding rule method”, page 29. Leave the folding rule on the shroud.• Roughly straighten the mast using the lower shrouds. Check that the mast is straight by sighting up the luff groove, all the way up from deck level. • Increase the cap shrouds tension to 20% of the breaking load of the wire. Count and make a note of the number of turns on both the port and starboard rigging screws required to increase the tension by 5% (1 mm stretch).• Tune the mast straight again using the lower shrouds. • Tension the backstay hard, but not exceeding 20% of the breaking load of the wire. Make a mark on your backstay tensioner or tackle so that you will always
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