 Doyle's
Code Zero is a hybrid spinnaker-genoa that
measures with a minimum midgirth of 75% of the foot length and a
leech length of not greater than 95% of the luff. The sail is uniquely shaped to sail at close apparent wind angles from 30 - 55
AWA.
How does this sail set?
The Code Zero is set with a
straight luff that fly's forward. It has an Aramid luff rope to take the enormous loads
developed by the sail. Code Zeros are
often controlled with a furler, but a spinnaker sock could also work.
When
would I use a Code
Zero?
Light air upwind when your apparent wind angles are greater than 30 degrees and up to 15
knots cracked off the wind, 30-55 APA, generally on longer distance races.
Will it work on my boat?
If you set the Code Zero from
the forestay intersection of the mast your rig should handle the loads fine, but if you
set the sail from any where else you should check with the spar
manufacturer.
White
= Genoa
Blue = Full
Asymmetrical
Red = Code Zero
Click here for information on sail
graphics.
 Code Zero
Trimming Guide
The Code Zero is a remarkable sail when properly set and trimmed. This short
trimming guide is meant as a Code Zero primer.
Code Zero Range: 38 - 55 AWA & 0 - 14 AWS
The Code Zero is the smallest asymmetrical spinnaker allowed by the
IRC/PHRF rule, 75% mid
leech to mid luff. This is a specialty sail generally built out of high
modulus materials
for light air cracked off to close reaching. Properly set, this sail will dramatically increase your
boat's performance as long as it can be trimmed as specified below.
The sail is designed with a straight luff and MUST be set with a straight
luff. Thus,
you will need the following installed on the boat. A Vectran halyard (no creep), a tack
location capable of holding the mast up. It's very important to keep the luff of the Code
Zero straight. If the luff of the sail sags too much, the sag will reduce the sails
shaping and cause the sail to invert and possible flog as the breeze increases. Most boats
will not be able to generate the luff tension necessary for this sail just by grinding the
sail up. One technique is to ease the backstay all the way off. Then grind the sail up as
tight as possible, then apply backstay tension to tighten the luff. If proper halyard
tension cannot be achieved on the boat then an APR 75 might be a better sail.
Trimming the sail is also critical. A spinnaker sheet should be
led through a tweaker
block attached to the rail in the general location where a 150% genoa would trim, and back
to the spinnaker turning block. The tweaker block should be used to pull the leech of the
sail down. If the leech of the sail collapses and a vertical line forms from the clew to
the head, the tweaker should be slightly eased. Most of the time some tension is needed on
the leech line and some small cupping of the leech will occur.
The Code Zero is such a break through sail because of the profile shape.
It's has an elliptical profile and generates most of it power in the upper half of the sail. Thus the foot of
the sail is actually quite a bit smaller than a spinnaker. The chord depth of the sail is
also quite a bit shallower than a spinnaker, and similar to a genoa. Thus if the boat is
over 35' Doyle recommends a 3.0 oz. mylar film-based material and if it's over 40'
a 3.0
oz. Aramid or other high modulus-based material.
For
more information or to order a Code Zero:
1) Contact your local DOYLE loft
2) Email us at info@doylesails.com
3) Call us at 1-800-94-DOYLE
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