All New Mainsails - Must be measured and reported regardless of the backstay!!
Existing Mains - As of 2016, all mainsails must be measured. Certificates will be marked as "Measured or Unmeasured". If marked as unmeasured, owners risk protest to prove the sail is not oversized. A 3 sec/nm penalty will apply for all unmeasured mainsails.
4 measurements are required when applying for a certificate.
Headwidth (HW): the maximum width (or projected width) of the headboard.
Main Girth Top (MGT):the length of the girth of the mainsail taken at the 7/8 point of the leech (from the clew) to the nearest point on the luff.
Main Girth Upper (MGU): the length of the girth of the mainsail taken at the 3/4 point of the leech (from the clew) to the nearest point on the luff.
Main Girth Middle (MGM): the length of the girth of the mainsail taken at the mid-point of the leech (from the clew) to the nearest point on the luff.
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