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on the old Loos gauge). The new gauge tends to be more accurate from gauge
to gauge but we have still found some that read as much as 2 units different. Be
sure to setup the boat consistently when taking this measurement. First put 5
units on the backstays. The mast bender should be neutral and the spreaders
swung back in the upwind position.
For the lowers measure from the top of the band at the boom up the mast 915 mm
(36") and make a mark. Then measure across from shroud to shroud it should
measure close to 735 mm (29"). It may have to be adjusted on the water to get
mast straight. Lighter crews or for sailing in constant moderate winds you may
want to tighten a little on the lowers to reduce power.
The shroud tension varies slightly between top boats but the common goal is to
make sure that the mast is straight sideways when sailing upwind. When sailing
upwind in 6 knots, the leeward upper just loosens so in wind above 6 knots the
uppers do not affect prebend. The lowers can be fine tuned when sailing to make
sure the mast is straight sideways. Normally when the right position is found no
further adjustments are necessary regardless of wind strength.
D) Mast Butt
If you have a new boat start out with the builder’s suggested mast step location.
On my Folli I sail with the mast in Folli’s standard location which is 4502 mm (14’9
1/4") from the transom/deck intersection to the center of the aft mast step bolt.
Light crews may want the mast a little forward compared with heavy crews. This
will help balance the helm from more healing.
After stepping the mast, the mast butt location can be quickly checked. With the
jibstay connected and backstays set, the forward edge of the outhaul boom band
will be even with the stern, or slightly behind the stern. On my Folli the band is
35 mm (1.5") behind the stern. On the Mader you will find the band about even
with the stern. Make sure that the mast is straight with the spreaders back and
not reversed when you check this. You may need some forward lever on. At the
same time I check the shroud car position.
E) Shroud Cars
I put the lowers just in line with the front of the mast and the uppers an inch or
5
Shrouds cont...
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