Mast Stepping and Tuning Instructions

Tuning Guide



Using two adjustable wrenches tighten the lower shrouds. Match the number of turns from side to side. Keep checking the rig to make sure it stays strait. Get the lowers tight enough to keep the rig strait at the lower spreader when you deflect the shroud at about shoulder height. Sight up the luff groove while pulling on the shroud to check this.

Using the wrenches tighten the upper shrouds. These ' shrouds will end up about the same tension as the lower shrouds.

Tighten any intermediate shrouds using the same method as the lowers and the uppers. The intermediate shrouds should not be as tight as the lowers or uppers.

Go sailing in medium wind (8-12 knot) upwind and check the tune of the rig. This mast should remain strait regardless of how far over the boat heels. The leeward shrouds should begin to go slack at about 15-deg. heel.

All rigging wire used on yachts has a tendency to stretch, especially on

a new yacht, and after you have sailed in heavier wind than you are normally experienced for, therefore, you should periodically check the tension on the shrouds and stays, and tighten them, if it is required. Rigging, as well as tuning, becomes all too important when setting up the mast. A knowledgeable person should oversee the rigging and tuning so as to eliminate the possibility of an eccentric load, which might occur with an improperly loaded shroud. Special attention should be given to the initial stretch of the shrouds and a further gradual stretch of the wire over the first few hard outings.


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