1 clew and tack measurement points ers – g.4.1 clew point the intersection of the foot and the...
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Clew and tack Measurement Points
ERS – G.4.1 Clew Point
The intersection of the foot and the leach, each extended as necessary
ERS – G.4.3 Tack Point
The intersection of the foot and the luff, each extended as necessary
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corner points
clew point
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corner points
clew point
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corner points
tack point
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5 steps to finding a corner
measurement point using a 1m batten
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Step 1
Tape some paper to the back of the sail in the area of the corner point
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Step 2
Hold the batten at its very ends with one end roughly where the corner
point will be and the other end touching the edge of the sail, held
firmly in place so it can’t move away from the edge
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Step 3
Move the batten at the corner point end curving it until the LONGEST length of the batten touches the
sail edge
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Step 4
Mark the curve of the batten on the paper
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Step 5
Do the same with the other edge
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The cross marks the point
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corner points
tack point
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Remember
ERS – H.5.3Attachments at a sail edge, other than a bolt rope and tabling, shall be ignored when measuring.
This does not cover attachments at the corner of a sail (remember edges and corners are different)
So, unless otherwise stated, corner attachments are included in measurement.
Attachments
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Head Measurement Point
ERS - G.4.2
• Mainsail : The intersection of the luff, extended as necessary, and the line through the highest point of the sail at 90° to the luff.
(b) Headsail: The intersection of the luff, extended as necessary, and the line through the highest point of the sail, excluding attachments, at 90° to the luff.
(c) Spinnaker: The intersection of the leeches, extended as necessary
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Where is the head point?
What are the limits on attachment size?
(At a mainsail head, attachments are included).
Head point
Mainsail
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head point
Headsail – ignore the corner attachment
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Headsail
excluding attachments
Headsail head point
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Widths
luff perpendicular
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Session 6
Other Measurements
This document is solely for the use of The International Sailing Federation. No part of it may be circulated, quoted, or reproduced for further distribution without prior written approval from the International Sailing Federation. This material was used by the International Sailing Federation during an oral presentation; it is not a complete record of the discussion.
4.09 break
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Areas of Reinforcement
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ERS – G.8.7
(a) At a Corner or an Edge(1) LENGTHAt the Head: The dimension from the head point along the luff or its extension to a line
through the highest point of the attachment at 90o to the luff.At the Tack: The dimension from the tack point along the luff or its extension to a line
through the lowest point of the attachment at 90o to the luff.At the Clew: The greatest dimension from the clew point.At an Edge: The greatest dimension from the sail edge.
(2) WIDTHThe greatest dimension measured perpendicular to the length.
(b) ELSEWHEREThe greatest dimension of the attachment.
Attachment Size
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head point
Attachment length
Attachment width