these rules are in a test period and may be modified yearly. IMCCA is not responsible for sails becoming obsolete due to a change of test rules
A4.01 Asymmetrical Spinnakers
Refers to Class Rule 05.04.00
This rule was introduced in 2005 for a test period of 5 years ending on December 31st, 2009
A4.01.01 Asymmetrical spinnakers are only allowed in Divisions “Racers” and “Cruisers”
A4.01.02 (05.04.01)
a. Spinnaker Luff (SLu): is the distance from Head Point to Tack Point.
b. Spinnaker Leech (SLe): is the distance from Head to Clew.
c. Spinnaker Half Width (SMG): is the distance between the half Luff point, equidistant between the Tack Point and the Head Point, and Half Leech Point.
d. Spinnaker Foot Length (SF): shall be the distance from Tack Point to Clew Point, measured on a straight line.
A4.01.03 (05.04.03) The Half Width (SMG) shall not be taken as less than 75% of the Spinnaker Foot Length (SF).
A4.01.04 The Foot Length (SF) shall not be taken as less than 1,5*STL (Bowsprit End Distance, see A4.02.02.b), and the Half Width (SMG) shall not be taken as less than 1,125*STL.
A4.01.05 (05.04.04) Sail Area of Asymmetrical Spinnaker (SMAS) is given by:
SMAS = (SLu+SLe)*(4*SMG+SF)/12
A4.01.06 (05.04.05) SMAS shall not be greater than 19,60 square metres.
A4.02 Spinnaker Poles and Bowsprits
Refers to Class Rule 05.05.00
This rule was introduced in 2005 for a test period of 5 years ending on December 31st, 2009
An asymmetrical spinnaker may be used with a Spinnaker Pole or a Bowsprit.
A4.02.01 (05.05.01) A spare Spinnaker Pole or Bowsprit may be carried on board and used for replacement of a broken Spinnaker Pole or Bowsprit whilst racing.
A4.02.02 (05.05.02)
a. The Spinnaker Pole Extension (SPL) shall be measured from the forward side of the Mast to the extreme outboard end of the Spinnaker Pole, set on its fitting on the Mast in a horizontal position on the centre line of the Boat. This changes ERS F.14.1.
An automatic spinnaker pole shall be set from the cockpit in its outermost position and measured with no other tension applied.
b. The Bowsprit End Distance (STL) shall be the distance measured from the forward side of the Mast to the forward end of the Bowsprit.
c. When not used for setting an asymmetrical spinnaker, a Bowsprit shall be retracted within the limits of the Hull template (see figure 1).
A4.02.03 (05.05.03)
a. The Spinnaker Pole length (SPL) shall not be greater than 2,25 metres.
b. When the Bowsprit End Distance (STL) exceeds 2/3 of Spinnaker Foot Length (SF), 1.5* the value of STL shall be used as SF for Spinnaker Area calculation.
c. When the Bowsprit End Distance (STL) exceeds 8/9 of Spinnaker Mid Girth (SMG), 1,125* the value of STL shall be used as SMG for Spinnaker Area calculation.
A4.03 Headsails
Refers to Class Rule 05.03.05
This rule was introduced in 2006 for a test period of 4 years ending on December 31st, 2009
A4.03.01 (replace 05.03.05 by text:)
No board is allowed in Headsails. No more than two battens of any size are allowed in Headsails except the Storm Jib, if the Top Inside Edges of the Batten Pockets are totally within 20% of LP from the Leech. The Top Inside Edge of the top Batten Pocket shall not be less than 33% of the Leech Length from the Head Point.
