Mast Rake is measured from the head stay measurement band on the aft face of the mast, to the
transom. Note- your lower measurement point should be 23mm above the foredeck. If its more,
add the difference to the rake measurement and if less, subtract it to get you in the ballpark.
Rake Measurements-
A Rig - 1508mm
B Rig - 1160mm
C Rig - 922mm
Main Boom- A round section is shown in the picture which is more flexible than the rectangular
Bantock one. This is personal preference but I like to be a bit flexi and light weight.
The boom sheet band should be aft of the post and lead aft for the sail relationship geometry to
be correct for downwind in comparison to the jib.
The Vang attachment along the boom should be about 100mm from the forward end.
I like to use a jackstay on the main luff. The jackstay attaches to the mast head swivel. The tension
adjusts at the bottom via the line and bowsie system slung under the gooseneck.
Jib Boom-Jib booms can be Bantock superlight sections or preferably a 10mm arrow shaft
section. If you can get away with no holes drilled it can reduce fatigue. I hook the jib sheet onto
the sliding ball set up that can hopefully be seen in the picture.
Keep jib booms as short as possible and set the gap to the mast at about 15mm for A Rig, 10mm
for B Rig and 5mm for C Rig. This determines the swivel position on the boom.
The jib sheet band should be about 10mm forward of the jib sheet hoop on the deck when the jib
is held on centreline and sitting up.
Note- When installing the rig into the boat, lean the mast back and locate the mast butt onto the
step 1st, then bring the mast forward into the mast gate. Preservation of the mast gate is
important.
Raceday Set Up and Trim
The following Sheeting Measurements for booms are measured from the edge of the boom to
centreline. So for mainsail it is to the centre of the post, and to centreline of mast for the jib.
The main twist is from the middle batten to the backstay and measured when the sail is relaxed.
This mainsail twist measurement is difficult to get accurate and may vary boat to boat with sail
shape and boom flexibility etc. so common sense is needed. If the boat has weather helm, ease
the vang and vice versa. Adjust until the boat feels balanced. In smooth air, the boat should sail
pretty much thumbs free.
The jib twist is measured at the top seam leech to topping lift.
Baseline Settings for Sailing
The measurements below will ensure a good relationship between the sails, and we can adjust
from here for other conditions.
The Baseline Settings are “maximum in” positions for your general mid range sailing upwind when
the boat is powered up and at full heel or nearly full heel and flat water. Dont be shy to ease from
here as the wind increases.
Luff tension should be just enough to take the out the slack, not necessarily under any real
tension.