ORC - KALENDARZ
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Spinnakers: Symmetric and Asymmetric
The half width of any spinnaker shall be 75 % or more of the foot length.
The symmetric spinnaker shall be symmetric in shape, material and cut, about a line joining the head to the center of the foot. The symmetric spinnaker shall not have adjustable leech lines.
Any spinnaker not qualifying as symmetric shall be considered as asymmetric. Where the asymmetric spinnaker is tacked on the centerline, tack pennants of any length may be used.
Battens are not permitted on any spinnaker. Symmetric spinnaker measurements include: leech length (SL), half width (SMG) as the distance between midpoints on the luff and leech and the foot length (SF). Asymmetric spinnaker and Code 0 measurements include: luff length (SLU), leech length (SLE), half width (AMG) as the distance between midpoints on the luff and leech and the foot length (ASF). The asymmetric spinnaker luff ASL is then calculated as the average of the luff and leech lengths making it possible to use the same formula for spinnaker area:
Symmetric spinnaker area
Asymmetric spinnaker area
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