J/133 OWNER GUIDE 31
Tuning The Rig
Tuning the Mast
Following is a general guide to tuning your J/133 mast. Please consult your sailmaker for “fine-tuning” the mast
to match the sails.
With the standard length J/133 headstay and the mast step situated in the middle, the mast rake (as measured
from the back of the mast at deck level to a plumb on the main halyard should be approximately 25.5 inches.
The upper shrouds are attached to the outer chainplate hole. The lowers are connected to the inner hole. The
intermediates are secured in the forward hole. Begin by hand tightening the shrouds, being careful to keep the
mast centered aloft. Check alignment by hoisting a tape measure up the main halyard and comparing
measurements to the port and starboard chainplates. When the top of the mast is centered, sight up the mast
track to check for alignment of the lower part of the mast. Adjust the shrouds as necessary to center the mast.
After the rig is centered and hand tight, we recommend additionally tightening the shrouds the following number
of turns:
Upper Shrouds: +11 turns
Lower Shrouds: + 8 turns
Intermediates: + 7 turns
You’ll find it easiest to tighten the upper shrouds if you pump the backstay down first to relieve load. Under sail,
it is easiest to adjust the leeward shrouds, then tack to adjust the other side.
Once you have initially tuned your J/133, then go sailing in a brisk breeze, spending equal time on both tacks.
Even though rod rigging is a very low stretch material, you’ll still see a little loosening after the initial breaking in
period. Be sure to sight up the mast while it is under load to see if the mast remains in column.
Rigging The Boom
Run the single line 1
st
clew/tack reef from the clew to the forward end of the boom, up through a sheave on
the boom, to an individual turning block attached to a SS hook (this hooks into tack reef grommet in sail).
This line will then lead down to the turning block at the mast collar, through the organizer and aft to a rope
clutch to starboard. The 2
nd
clew reef line leads in a similar fashion but exits the boom down to the mast
collar block then aft, also to starboard.
• Attach boom gooseneck to lug on mast.
• Attach QuikVang to mast lug at deck and then boom lug (hoist end of boom with main halyard if
necessary).
• Install mainsheet blocks.
• Rig mainsheet per rigging diagram.
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