Rule Interpretation RI-15-01

RI-15-01
JIB MINIMUM WEIGHT REQUIREMENTS (2015-04-09)
Q1: Why does the Class specify a minimum jib weight?
A1: Originally, this requirement was intended to make dacron jibs more competitive by requiring that the new (at the time) laminate jibs weigh as much as the dacron jibs. Now, the function of the minimum weight requirement is to result in jibs with a heavier ply weight in the body of the sail to increase their longevity by increasing the amount of load-bearing fibers that can be built into the sail without incurring an overall sail weight penalty while acknowledging that specifying a ply weight in g/m2 is not practical for laminate sails.
Q2: What means of construction can be used to manufacture a jib that meets the minimum weight requirement?
A2: Class Rule 6.5.1 specifies what materials may be used in constructing the jib. While somewhat skirting the intent of this rule, we recognize that many sailmakers use heavier-than-necessary tack, clew, and head reinforcement patches to meet the minimum jib weight. Any primary or secondary reinforcements must be made of materials that meet CR 6.5.1. If they do, then that method of meeting the minimum jib weight is legal.
Most jibs use a stainless steel ring at the tack and/or head, and a metal ring or clew board that do not technically meet the requirements of CR 6.5. This deviation from the Class Rules is allowed as a long-standing common practice. However, the addition of metal weights or any other material to the sail for the sole purpose of meeting the minimum weight requirement is contrary to the intent of the rule and thus illegal. The jib must meet the Class minimum weight requirement with all the materials used in its construction serving a functional purpose as part of the sail or being comprised of authorized materials.
There is no restriction on the materials of construction of the battens.

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