MEASUREMENT GUIDE

Revised December 31, 2002 Effective 1 January, 2003
These instructions are to be read in conjunction with the:-
International Contender Class Rules;
International Contender Plans;
International Contender Class Measurement Form.

This Measurement Guide gives the suggested sequence for carrying out the measurement procedure but is not a part of the Rules. Diagrams are not to scale
RULE NO.
1
Except for the centreboard and lines controlling it, remove all loose fittings and other control lines and sheets.
2
HULL INVERTED Level the hull to the base line, by erecting templates (a) and (b) at stations 1 and 8, fix the templates by using plasticine or an equivalent. Use a water-level of a length of clear plastic tube. Similarly level the hull athwartship, using the sheer points at the transom.
8.4.

RULE NO.
2.1
Check that the transom is correctly placed
8.3

Use a level or plumb bob and measure the rake forward or aft.
N B. Forward rake:- The overall length measured at deck level must be corrected for the amount of rake.

2.2
Check that the stations are permanently marked along the line of the keel from the transom : - 610 - 1220.5 - 1831 - 2441.5 - 3052 - 3662 - 4272.5 mm +/- 2 mm. Around the outer skin of the hull, on the rubbing strakes from the transom : - 617.5 - 1231.5 - 1843 - 2455 - 3071 - 3700.5 - 4347.5 mm +/- 2 mm. Mark each station with masking tape. Use an edge nearest to the stem as a location point. Extend the tape around the rubbing strakes to the sheerline on the deck
8.4
2.3
Measure the shortest distance (vertically) from each keel station to the base line.
8.4
2.4
Remove the base line and templates (a) and (b), measure around the keel from the transom to the fore and aft intersections of the centre-board slot and the outer skin.
8.2
2.5
Raise the centreboard to maximum height. Measure vertically the maximum height of the centreboard above the keel. Check that the centreboard can be completely retracted.
11.3 11.2

RULE NO.
2.6
Check each station against the official templates. Commencing from the transom station 1 vertically align each template on its appropriate station, use plasticine or an equivalent to hold the template in position. Check that the sheerline falls within the maximum or minimum datum lines and measure the maximum clearance between the outer skin of the hull and the edge of the template. Maximum is 16 mm.
8.2

2.7
Check that there are no concave hollows greater than 3 mm in any section. use a straight edge to check.
8.2

RULE NO.
3
HULL UPRIGHT Remove the centreboard and control lines.
3.1
Level the hull to the base line by using the level or plumb bob on the transom and setting it in the reverse to 2.1.
3.2
Mark the sheerline on the masking tape at stations 3, 4, 5, 6, 7 and 8.

3.3
Measure the plan width of the decks at stations 5, 4 and 3.
9.1

Record the width for both decks at each station (starboard first).

RULE NO.
3.4 Measure the depth of the cockpit below the sheerline at stations 3, 4 and 5.
9.1

Use a measuring bar of a right angle section of aluminium 50 x 25 x 3 mm with datum marks 400 mm from the centre. Measure (a) from the bar to the sheerline mark and (b) from the bar to the cockpit floor. Subtract (a) from (b). Note. Record depth on both sides of the station (Starboard first).
3.5
Measure the deck camber at stations 1 to 6, at the mast step and stations 7 and 8. 9.1 9.2

The camber is the average between (a) and (b). Use the measuring bar supported on wedges and fixed athwartship. For item 36 place the bar at the most aft possible location of the mast on the mast step and deduct the depth of the mast step.

RULE NO.
3.6
Measure the horizontal measurements. All taken from the intersection of the transom and the deck excluding any overlap, but add any additional distance equal to the amount the transom is raked aft. (Note item 2.1).In measuring the overall length, apply the sheer template to the stem to locate the forward position.
9.1 13.9 14.2 8.1 14.1

RULE NO.
4
HULL SUPPORTED on a beam-end, or with the transom over a pit. Measure the depth of the rudder below the keel line. Fix the rudder on the pintles and support a square from the transom.
12.2

4.1
Check the rudder-blade against the template for underwater profile. Fix the template flush against the leading edge, the maximum tolerance between the template and the aft edge and toe is 16 mm.
12.1
4.2
Weigh the rudder including tiller, stock and fixed fittings.
12.5
5
Check the centre-board against the template for underwater profile. (as for 4.1)
11.3
5.1
Measure the thickness of the centreboard below the keel line. Note maximum 26 mm.
11.1
5.2
Weigh the centreboard.
11.5
6
Weigh the bare hull. The hull shall be dry and includes 16.1 fixed fittings, mainsheet traveller strop and compass if fixed, but excludes all control lines and sheets.
16.1
6.1
Check any correctors. The total weight shall not exceed 6 Kg. rigidly fixed correctors, which must be equally divided at the ends of the cockpit.
16.2

RULE NO.
7
Attach the boom to its gooseneck. Measure the distance between the forward edge of the measurement band and the aft side of the mast including sail-track.
15.3

7.1
Check that the boom is inherently straight as manufactured. A bend downward near the kicker attachment is permissible if it appears due to heavy hard use.
Check that the boom without fittings passes through an 120 mm diameter circle.
15.1
15.2
8
The mast shall be inherently straight as manufactured. Small bends that appear to be due to heavy use or due to contact with an obstacle such as the bottom is permissible.
Measure the fore and aft depth of the mast
13.1
8.1
Measure the athwartship width of the mast.
13.1
8.2
Measure the distance from the deck to the top of the upper edge of the lower distinguishing band. Note the allowance for the thickness of the base of the mast step. Maximum 585 mm.
13.5
8.3
Measure the distance between the top of the upper edge of the lower band and the upper edge of band 2 (minimum 3350 mm) and to the lower edge of band 3 (maximum 3760 mm). Note that the forestay, shrouds, trapeze wires or their extensions must intersect the surface of the mast between the bands 2 and 3.Note this does not include any lower shrouds that do not wholly support the mast, but limit bend.
13.5 13.6
8.4
Measure the distance between the top of the upper edge of the lower band and the lower edge of the top band 4 (maximum 5842 mm).
13.5
8.5
Check that the bands are clearly discernible and are permanently marked with a band of a min. width of 10 mm.
13.5
8.6
Check that there is a hole or holes drilled in or near the heel of the mast of a total min. area of 200 Sq mm.
13.12
8.7
Check that the mast cannot rotate or that there is no equipment adjusting the mast step location, the length of the shrouds or forestay while racing.
13.3 13.10
8.8
Measure the diameter of the standing rigging. Note min. 2.3 mm .
13.11
8.9
Weigh mast and all rigging, but not harness fastener or fastener adjustable rigging. Min. 7 Kg.
13.7
8.10
Check the tip weight of the mast by weighing at the lower edge of the top band 4, while the mast is supported at the top edge of the lowest band 1. The halliard shall be in sailing position, shrouds, forestay, trapeze wires and halliard tails secured along the mast to band 1. Min. 3 Kg.
13.8

RULE NO.
9
Lay out the sail on a clean surface. Mark the leech measurement points. Fold the head down to the clew and mark the edge of the sail at the resultant fold on the leech. Repeat to mark the 1/4 and 3/4 height positions. Applying sufficient tension to remove any creases, measure the 1/4, 1/2 and 3/4 height widths of the sail, using the ‘swinging tape’ method to determine the shortest (perpendicular) distance between the leech point and the luff. These measurements are taken overall, including any bolt rope. Any hollows in the leech must be bridged and the measurement taken to that line. Note that there are no restrictions on the type,weight or colour of sail material which may be used.
17.11
9.1
Measure the length between the head & clew. Apply sufficient tension to remove creases.
17.9
9.2
Measure the distance from the head to the intersection extended if necessary of the top of the top batten pocket on the forward edge on the luff or bold rope. (Note in some sails considerable tension is required to simulate the distance when the sail is set on a spar)
17.7
9.3
Measure the maximum dimension of the headboard in any direction.
17.6
9.4
Check the number of batten pockets and that they divide the leech (aft edge of the sail) into approximately equal distances. Make a note on the form if the distance exceeds +/- 50 mm. Measure the length of the pockets. Ignore any elastic sewn inside the inboard end of the pocket.
17.7
9.5
Measure the height, width, thickness and spacing of the Class emblem, the National letter and sail numbers. Record any deviation on the measurement form. The Class emblem can be placed back to back, while other figures must not overlap. Those on the starboard shall be the highest placed and all shall be above a line one third up the luff.
17.4 17.5

9.6
Note that double luff sails are prohibited. 17.12
9.7
Measure the secondary reinforcement in the corners of the sail. This must not exceed more than two additional layers of material having the same weight as the body of the sail. Maximum 325 mm. 17.2
9.8
Check that the sail does not project more than 5 mm past a straight line joining the headboard, or ends of batten pockets or clew eyelet. 17.8
9.9
There was formerly a requirement for sail window.
Now there is no requirement.
9.10
Check that the maximum distance of any sailmakers mark does not exceed 405 mm from the tack. Note the permanent sail number of the sailmaker. If no such number is present, the measurer will allocate a unique number, mark it on the sail near the tack, and record it.
17.13