Squaretop Mainsail.

Matt,

Thanks for the assist. I'll have to brush up on my image posting skills.

Matt, am I connecting the dots right regarding class legality of Hobie contracted Whirlwind H20 sails?

5.5 Third sails of open design may be carried on
board and used on any point of sail. Fittings and
equipment to fly the sail are the owner's and designer's
choice. The following limitations apply
to the third sail design:
a) The open design sail cannot be attached to
the mast above 28 ft. (8.53 meters) measured
from the bottom of the mast extrusion.
b) Fittings and equipment for sheeting the open
sails must be attached to or mounted on existing
aluminium extrusion.
c) A maximum of two open sails may be carried
on board at an event and shall not be
replaced during a race or regatta unless
damaged and no longer usable. Race
Committee approval for a replacement sail
must be received prior to sail use.
d) A maximum of two open sails may be registered
and identified before the start of each
event. A Race Committee member's signature
on the sail is acceptable identification.
e) A spinnaker pole no longer than the distance
from the center line of the front crossbar to
either bow may be used to fly the open
sails. Rigging is of open design.
f) No more that one open sail may be flown at
any one time.
g) Third sail parameters are:
Maximum luff 30 ft. (9.15 meters)
Maximum foot 20 ft. (6.1 meters)
Minimum S.M.G. 13 ft. (3.96 meters)
IHCA Rule Book 2009-2012 rev. 091001 Page 31
h) Registered open sail(s) may or may not be
carried on board during each race of an
event.