I never realized that PHRF has it own spin rules ... and probably different regions have different rules. But they do allow use of A or S spins. but seem to limit the pole to the max length of the manufacturer here in SWFL.
Here are the PHRF rules for SW FL ... our OD spins probably violate some of this. But generally no one ever measures local phrf sails.
5.3 Symmetrical spinnakers
a. Luffs must be equal length and no longer than 95% of the square root of the sum of I squared plus J
squared.
b. The sail must be symmetrical about a line joining the head to the center of the foot.
c. The mid-girth (SMW) shall not be less than 75% of the foot (SF) length nor more than 180% of J.
d. Symmetrical Spinnakers shall be measured with such tension as to remove wrinkles along the line of
measurement. The sail maker or owner of the boat shall sign the sail indicating date of measurement, the
maximum length of the luffs and maximum width, and his/her compliance with all other
requirements. Failure to comply with this requirement shall not be grounds for disqualification.
e. SL (Spinnaker Luff) shall be the length of either the sail's luff or leech along the edges of the
sail from head to foot, with luff and leech being equal length. Where stiffening is used to extend the angles
at the tack or clew of spinnakers beyond an included angle of 110%, the greatest length of any such
stiffening in the foot of the sail measured from the clew shall be added to the luff length to determine SL.
f. SF (Spinnaker Foot) shall be the distance from the tack to the clew measured in the shortest path on the
surface of the sail and shall not be greater than 180% of the J measurement.
g. Limitations
i. Spinnakers shall be sheeted from only one point on each side of the sail.
ii. Battens shall not be used on spinnakers.
iii Reefing of symmetrical spinnakers is not allowed
Last edited by Cap'n Vic; 01/28/11 11:57 PM. Reason: corrected problems with cut and paste process
