1

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

corner points

clew point

3

corner points

clew point

corner points

tack point

5

5 steps to finding a corner

measurement point using a 1m batten

6

Step 1

Tape some paper to the back of the sail in the area of the corner point

7

8

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

9

10

Step 3

Move the batten at the corner point end curving it until the LONGEST length of the batten touches the

sail edge

11

12

13

14

15

16

17

18

19

20

21

Step 4

Mark the curve of the batten on the paper

22

23

Step 5

Do the same with the other edge

24

25

The cross marks the point

26

corner points

tack point

27

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

28

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

29

Where is the head point?

What are the limits on attachment size?

(At a mainsail head, attachments are included).

Head point

Mainsail

30

head point

Headsail – ignore the corner attachment

31

Headsail

excluding attachments

Headsail head point

Widths

luff perpendicular

33

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

34

Areas of Reinforcement

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

36

head point

Attachment length

Attachment width