| Rig Tuning for the Composite Spars Mast |
These guidelines were developed by Richard Ray with assistance from Jim Antrim
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* Pre-bend at upper spreader ~4.75" * Pre-bend at lower spreader ~5.50" Mainsails should be cut for this mast pre-bend. After starting with the initial static tuning tensions (listed below), the V1 shrouds often have to be slightly adjusted (less then 8 turns) to get the mast pre-bend to match the mainsail. Ideally the mainsail should look great in moderate winds with the initial tuning. If the mast is over-bending, diagonal wrinkles will eminate from the luff of the mainsail towards the clew. After tuning, the distance from top of mainsail halyard shackle (hoisted to top of the mast) to upper aft corner of the rudder support wedge on the cockpit sole is 41'6". In round numbers: V1 tension == V2 tension + D2 tension |
| Adjustment | Tension #'s | Loos Gauge # | Notes |
| Headstay 5mm | 1030# | 26 | This is the initial and recommended maximum tension used for tuning & heavy air sailing. After making adjustments to other shrouds re-check the tension and adjust the rig adjuster if needed. In lighter air the rig adjuster is eased off allowing a more full sail. When the rig adjuster is eased the pre-bend is reduced and the diagonals go slack. |
| V1 6mm | 1200# | 37 | This is the primary control for mast pre-bend and rake. |
| D1 5mm | 770# | 23 | This is a secondary control of pre-bend at the lower spreader. |
| D2 5mm | 840# | 24 | This is a secondary control of pre-bend at the upper spreader. |
| V2/D3 5mm | 370# | 15 | This is the mast tip control. This is left with less tension to allow the top to bend off in a puff. |
| notes: | # == LBS. |
5mm == 3/16 on Loos Gauge model PT2 6mm == 1/4 on Loos Gauge model PT2
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