Measurement of reduced area sails with an extended luff

Question Details

Is the extension fitted to the sails in the photograph to be considered as part of the sail or as a halyard? If the extension is part of the sail then:

  1. Do these sails comply with G.3.2 (b) (1994 CR 6.3.1)?
  2. Where is the head point?
  3. How are the "correct positions" of the battens to be found for clause G.3.3 (1994 CR 6.3.2)?
  4. Do these sails satisfy the requirements of measurement form item 10 (1994 MF item13)?



a      Yes. The upper part of each sail is clearly not separable from the remainder of the sail and is therefore part of the sail. Taking the individual points raised above in turn:
The class rules are open class rules and therefore anything which is not specifically prohibited is permitted. CR G 3.2 (b) requires the mainsail to be trilaterial and bounded by the luff, foot and leech. There is no rule which prohibits a concave leech but hollows shall be bridged as described by ERS H.5.2. For the 1994 class rules the IYRU SMR describe how to handle measurement of a sail with a hollow leech. The sail is not a quadrilateral sail and has the three required edges. Restrictions are placed on the shape and size of the sail elsewhere in the CR and the sail shall comply with those restrictions.

b      The head point is defined in the ERS G.4.2 and is found as the intersection of the luff, extended as necessary, and the line through the highest point of the sail at 90 degrees to the luff. For the 1994 CR the IYRU SMR apply but the effect is the same. The design of the sails referred to does not affect this measurement.

c      The batten position is limited as in G.3.3 (1994 CR 6.3.2). The design of the sails referred to does not affect this measurement.

d      Yes. See (a) above.