Measurement Rules
Last updated 16/09/07
For a downloadable PDF version of the Measurement rules click here. 
The Yeoman & Kinsman Association does not except any liability arising from actions taken inaccordance with the rules including past and future changes. Any modifications made to boats outside of the rules are done at the owners risk and the owner takes full liability.
1.1 The Measurement Rules and specifications are intended to ensure these restricted design classes conform to the prescribed measurement as stated in the Rules.
1.2 No alteration to the structure of the hull, decks, keel, rudder, skeg, sails and standing rigging other than allowed under the rules shall take place without prior agreement of the Class Association. Such changes to be assessed on the water for a minimum of one year.
1.3 The following measurement rules shall apply to both the Yeoman and the Kinsman except where individually provided for.
1.4 The Class Association does not accept any legal responsibility in respect of these rules and/or the drawings or any claims arising therefrom.
1.5 There shall not be any retrospective effects upon boats, their equipment, fixtures and sails consequent upon the approved alteration of a measurement rule.
1.6 Any interpretation of the rules shall be made by the Class Association in conjunction with the designer and the Appointed Builder.
G.R.P Mouldings shall be produced only by E.C. LANDAMORE & COMPANY LTD. (herein called "The Designer"), or by Builders licensed by them using the official moulds.
3.0 Registration and Measurement Certificate
3.1 No boat shall be permitted to race in races recognised by the Class Association unless it has a valid registration certificate and its sails have been endorsed.
3.2 The Builder, in conjunction with the Association, will issue boat numbers.
3.3 No two boats shall have the same name, except when designated 1, 2 etc and then only with the permission from the Yeoman/Kinsman Association.
3.4 The registration certificate is obtained as follows:-
3.4.1 The Builder shall apply for a boat number and the owner shall at the same time submit the proposed name of the boat to the Class Association Secretary, who will issue the Registration Certificate.
3.4.2 The Builder shall endorse the certificate that the boat has been built from the approved moulds and to the Yeoman/Kinsman Class Rules at the time in force.
3.4.3 The secretary of the Class Association shall finally countersign the Registration Certificate.
3.5 It is the owner's responsibility to ensure that his boat, its spars, sails and equipment comply with the Class Rules at all time, and that alterations, replacement or repairs do not invalidate the certificate.
3.6 A certificate shall be valid only during the current period of ownership for which it is issued and shall be invalidated on a sale of the boat. The certificate shall be revalidated or replaced only upon re-registration with the Class Association by the new owner and payment of the appropriate membership fee.
4.1 The Class Association or any Race Committee may require that a boat or its spars, sails and equipment be liable to measurement or re-measurement at any time.
4.2 Only Measurers approved by the RYA or the Class Association shall measure a boat, its spars and equipment and sign a declaration on the registration certificate that they comply with the Class Rules.
4.3 Measurement tolerances are intended to allow for genuine building errors and shall not be deliberately used to alter the design. The Measurer shall report to the Committee anything which he considers to be a departure from the intended nature and design of the boat, or to be against the general interest of the class, and a certificate may be refused, even if the specific requirements of the rules are satisfied.
4.4 A Measurer shall not measure a boat, spars, sails or equipment owned by himself, or in which he is an interested party or has a vested interest.
4.5 All boats, spars, sails and equipment shall comply with the current rules.
4.6 Owners shall have all new or subsequently altered sails measured by a Measurer approved by the RYA or the Class Association in accordance with part 17 of these rules. The Measurer, if satisfied, will endorse the sail by signing or stamping the sail near its tack.
5.1 The hull shall carry the boat number cut into the hog. Where this is not practicable a plate bearing the number shall be attached under the cuddy.
5.2 The mainsail and spinnaker shall carry identification marks as indicated in the rule 17.4.
6.1 The hull and deck shall be G.R.P construction in accordance with the specifications, from the moulds approved by the Class Association in conjunction with the Designer and appointed builder. As at 1st June 2004 the following moulds have been approved. Hull - the original mould, Deck - the original mould; the 200 Series mould; the 300 Series mould.
6.2 The Hull and deck mouldings shall not be modified except that holes not exceeding 120mm in any direction are permitted for the attachment or installation of appropriate equipment.
6.3 A spinnaker chute may be fitted through the foredeck provided that it is manufactured but not necessarily fitted by the Class Builder.
6.4 No internal ballast is permitted
7.1 The length overall shall be 6075mm +/- 30mm excluding any fittings.
7.2 At its widest point the beam shall be 1980mm +/-30mm excluding any gunwale rubbing strip.
8.1 The keel shall be of fine grain cast iron manufactured to the pattern approved by the Class Association in conjunction with the approved Builders and the Designer. The keel may be treated with any paint or resin providing that the profile or section remain unaltered.
8.2 The shape of the keel shall be controlled by the Designer's drawings and templates.
8.3 The point where a line projected up the leading edge of the keel meets the hull shall be 3500mm +/-20mm from the aft base of the transom measured under the hull.
Kinsman
8.4 The keel shall be of the lifting type and conform to 8.1 and 8.2 above.
8.5 The front edge of the keel casting shall exit the hull at 3430mm +/-20mm from the aft base of the transom measured under the hull.
8.6 The keel shall be fully lowered at all times while racing.
9.1 The profile of the rudder blade shall conform to the approved mould and shall fit the female template with no greater clearance than 6mm at any point.
9.2 The sectional shape of the rudder blade shall fit the templates taken from the approved mould with no greater clearance than 3mm at any point.
9.3 The rudder and spindle shall weigh not less than 6.5 kg.
9.4 The position of the centre of the rudder spindle shall be 605mm +/-10mm from the centre aft base of the transom to the centre line of the spindle measured under the hull.
9.5 No faring is permitted between the rudder and the skeg.
9.6 For profile of an alternative rudder which dispenses with the inclusion of a skeg the rudder blade shall conform to the approved mould and shall fit the female with no greater clearance than 6mm.
Kinsman
9.7 The rudder blade shall conform to rules 9.1, 9.2, 9.3, 9.4 and 9.6 above and form a lifting unit with the skeg as per rule 10.4.
9.8 If a "kick-up" lifting type rudder blade is used then it may be made of any material and to any design, providing the profile is no greater than the otherwise specified rudder.
9.9 When the alternative rudder referred to in 9.6 is used the centre of the spindle may be moved up to 70mm further forward.
10.1 The profile of the skeg shall conform to the approved mould and shall fit the female template with no greater clearance than 6mm at any point.
10.2 The sectional shape of the skeg shall fit the templates taken from the Designer's drawings and with no greater clearance than 3mm at any point.
10.3 The weight of the skeg shall not be less than 1.5kg.
Kinsman
10.4 The skeg as above shall be of the lifting type manufactured in accordance with the original drawings.
10.5 The profile of the skeg shall conform to the Designers drawings and shall fit the female template with no greater clearance than 6mm at any point.
10.6 The sectional shape of the skeg shall fit the template taken from the Designer's drawings with no greater clearance than 3mm at any point.
10.7 The weight of the skeg together with its frame but without the rudder shall not be less than 2.7kg.
10.8 The rudder skeg unit shall be fully lowered while racing.
10.9 No faring is permitted between the rudder and the skeg.
11.1 Genoa fairlead's which may be adjustable fore and aft but shall be mounted within the confines of the flat top or inside of the coming section.
11.2 Fore and aft mooring cleats or rings shall be securely fitted on the centre line of the fore and aft decks respectively.
11.3 A set of toe rails shall be fitted.
11.4 Floorboards, where originally fitted, shall be secured and fitted on not less than 7 bearers.
11.5 Aft main sheet tacks if fitted shall be a maximum length of 1200mm and fitted no further than 900mm forward of the aft top face of the transom.
11.6 Jib fairlead's, if fitted, may be adjustable and shall be mounted on the deck adjacent to the cuddy.
11.7 Self-bailers, if fitted, shall be on each side of the hull in a position above the waterline.
11.8 A stem head fitting, if fitted shall not project forward of the hull by more than 25mm.
11.9 A rubbing strake, if fitted, shall not project more than 20mm outboard of the hull.
11.10 There shall be no aids to support the helm or crew outboard except toe straps, which when fitted, shall be unable to be extended outboard of the sheerline.
11.11 Outboard motors or brackets extending beyond the transom are not permitted whilst racing.
11.12 Foresail furling gear, when fitted may be positioned either above or below the deck. A cut out section in the foredeck is permitted provided that the furling gear is located in a compartment which does not extend further than 290mm from the foremost part of the bow (excluding stem head fittings).
11.13 A centre mainsheet system which bisects the cockpit is prohibited.
The minimum all-up sailing weight in dry conditions including fittings in rules 11 and 14, spars and correctors if any, excluding sails, shall not be less than 670kg.
13.1 The mast shall be fitted on a pivot (tabernacle) on the centre rear edge of the cuddy with the centre of the mast pin 2760mm +/- 20mm to the foremost point of the bow (excluding stem head fitting). Alternatively the mast may be pivoted , about a pin 210mm +/- 20mm vertically below that point. With the mast protruding through a slot in the rear of the cuddy where the original tabernacle was positioned.
13.2 The mast shall be of aluminum alloy extrusion with a continuous grove which shall be integral with the spar section.
13.3 Distinctly coloured bands not less than 10mm wide shall be marked as follows with those for any boat with the tabernacle set in the lower position noted in brackets.
13.3.1 Band A, the lower edge of which shall be no more than 7485mm (7695mm) above the lower edge of the mast heel.
13.3.2 Band B, the lower edge of which shall be no more than 6720mm (6930mm) above the lower edge of the mast heel.
13.3.3 Band C, upper edge of which shall not be less than 370mm (580mm) above the lower edge of the mast heel.
13.4 Rotating and permanently bent masts are prohibited but a set, due to distortion of up to 50mm between band A and band C or D is permitted.
13.5 The mast shall have one set of spreaders for the upper shrouds which shall fit above the lower shrouds and be limited to 580mm long from the outside of the mast to the bearing point of the shroud.
13.6 The weight of the mast including normal fixed fittings and rigging shall be not less than 16.8kg.
13.7 The centre of gravity of the mast including normal fixed fittings and with the rigging secured along the mast with this led back, if necessary shall not be less than 3500mm above the lower edge of the mast heel.
13.8 No part of the spinnaker pole fitting(s) attached to the mast shall project for more than 65mm from the mast.
14.0 Standing and Running Rigging
14.1 The standing rigging shall be of stainless steel or galvanised wire, diameter not less than 4mm and shall consist of 1 Forestay, 1 Pair of main shrouds, 1 Pair of lower shrouds and 1 Backstay - which may include an adjusting system of varied material.
14.2 The forestay shall be attached to the boat no further forward than the forward extremity of the deck.
14.3 The jib shall be attached behind the forestay or on the furling assembly.
14.4 No shroud plates shall be fitted further outboard than the outer skin of the hull and the centre positioned at 3250mm +/- 150mm from the foremost point of the bow (excluding stem head fitting).
14.5 The lower shrouds should be attached to separate shroud plates no further forward than the front face of the mast.
14.6 The extension of the line of the top of the spinnaker halyard, when held taught at right angles to the mast shall be attached below band B and the shrouds forestay and genoa halyard shall be attached below this point.
14.7 The shrouds shall not be adjusted while racing.
14.8 No sheeting is permitted through or outboard of the hull.
14.9 No controls shall be hydraulically actuated.
15.1 The boom shall be of aluminum alloy extrusion with a fixed bolt rope track which shall be integral with the spar section. The section must not exceed 100mm deep x 85mm wide.
15.2 A distinctive coloured band not less than 10mm wide shall be marked on the boom with its inner edge not more than 2565mm from the aft side of the mast, including the groove but excluding any local curvature, when the boom is fitted and horizontal.
15.3 Permanently bent booms are prohibited but a set, due to distortion of up to 25mm between the measurement band and the fore end of the boom is permitted.
15.4 Cutaway booms are allowed provided the cutaway does not exceed 625mm at either end.
16.0 Spinnaker Pole and Whisker Pole
16.1 May be of wood or aluminum alloy.
16.2 The overall length, including fittings shall not exceed 2550mm.
16.3 Shall be able to pass through 75mm diameter circle.
17.1 The following sails are permitted, standard mainsail, high aspect genoa or standard genoa or jib, spinnaker (only one shall be carried in a race).
17.2 Sails shall be made and measured in accordance with the R.Y.A/I.S.A.F. Sail measurement instructions except where varied herein. The mainsail, genoa, jib and spinnaker shall be of woven polyester material having the same fibre throughout. Unwoven windows are permitted in both the mainsail and genoa. The transparent material of such windows shall not exceed 0.3m sq per sail. Windows shall not be placed closer to the luff, leach or foot than 150mm.
17.3 Sails may be made by any Sailmaker, the mainsail, jib and genoa shall be white, except that coloured draft stripes are permitted. Spinnaker to own choice.
17.4 The sail numbers, letters and class emblem shall be placed as laid down in the I.S.A.F. yacht Racing Rules. The emblem shall not be less than 565mm high or 310mm wide. Numbers and letters shall be of the following minimum dimensions:-
Height 300mm; width 95mm (except No.1) thickness 50mm. Minimum space between adjoining figures 60mm. All Yeoman sail numbers will be black with exception of numbers on the spinnaker when white will be accepted should black be insufficiently visible on the coloured background. The Yeoman and Kinsman insignia shall comply to the pattern of the Designer. The Yeoman insignia will be black and the Kinsman insignia and sail number will be red.
17.5 Mainsail
17.5.1 No part of the sail or headboard shall extend beyond the inner edge of the prescribed mast bands 'A' and 'C' and the boom band.
17.5.2 The length of the leech shall not exceed 7350mm (straight line measurement).
17.5.3 The mainsail shall have three battens of any material which shall divide the leech, the aft edge of the sail into four (equal) parts (+/-50mm). The outside length of the batten pockets shall not exceed; Top 765mm, middle 915mm, bottom 915mm. The inside width of the batten pockets shall not exceed 50mm.
17.5.4 The distance between the head point and the aft head point shall not exceed 115mm measured at right angles to the luff.
17.5.5 The distance from the 1/4, 1/2 and 3/4 leech points to the nearest point of the luff, including the bolt rope, shall not exceed 2155mm, 1600mm and 920mm respectively. Any hollows in the leech shall be bridged by straight lines. The 1/2 leech point shall be determined by folding the sail with the head point even with the clew point. The 1/4 and 3/4 leech points shall be determined by folding the clew and head points to the half leech point.
17.5.6 One set of reef points or cringles for slab reefing may be fitted. One on a line 1066mm up the luff and the other 1091mm up the leech.
17.5.7 For a reduced sail, there is no restriction on the position of the battens, provided the luff measurers no more than 5970mm, the leech measures no more than 6200mm and the foot measures no more than 2360mm. The distance between the head point and the aft head point shall not exceed 115mm measured at right angles to the luff.
17.6 High Aspect Genoa
17.6.1 The 'triangulation' method of measurement shall be used if the width of the sail at the head exceeds 30mm.
17.6.2 The length of the luff shall not exceed 6967mm.
17.6.3 The length of the leech shall not exceed 6425mm.
17.6.4 The length of the foot shall not exceed 2950mm.
17.6.5 The measurement from the head to the mid point of the foot (determined by placing the clew point above the tack point) shall not exceed 6665mm.
17.6.6 Battens are prohibited.
17.7 Standard Genoa
17.7.1 The 'triangulation' method of measurement shall be used if the width of the sail at the head exceeds 30mm.
17.7.2 The length of the luff shall not exceed 6325mm.
17.7.3 The length of the leech shall not exceed 5740mm.
17.7.4 The length of the foot shall not exceed 3355mm.
17.7.5 The measurement from the head to the mid point of the foot (determined by placing the clew point above the tack point) shall not exceed 5950mm.
17.7.6 Battens are prohibited.
17.8 Jib
17.8.1 The 'triangulation' method of measurement shall be used if the width of the sail at the head exceeds 30mm.
17.8.2 The length of the luff shall not exceed 6325mm.
17.8.3 The length of the leech shall not exceed 5820mm.
17.8.4 The length of the foot shall not exceed 2290mm.
17.8.5 The measurement from the head to the mid point of the foot (determined by placing the clew point above the tack point) shall not exceed 6050mm.
17.8.6 Battens are prohibited.
17.9 Spinnaker
17.9.1 The spinnaker shall be a symmetrical, three cornered sail. No headboard, battens or other stiffening device other than normal woven reinforcing is permitted.
17.9.2 The sail shall be measured folded along its centre line with the leeches together.
17.9.3 The length of the leeches shall be a maximum 6400mm measured along the edge of the sail from the head point to the clew point.
17.9.4 The half width measurement of the foot shall not exceed 2250mm measured around the edge of the sail.
17.9.5 The half width measurement at half height shall be a maximum of 2288mm and a minimum of 85% of the sails half width foot measurement. The measurement shall be taken between points on the leech and the centre fold midway between the head and the foot.
17.9.6 The length of the centre fold shall be taken as the distance between the head and the mid point of the foot, measured around the fold of the sail and shall be a maximum of 7300mm.
18.1 There shall not be less than two and no more than four persons on board when racing in open class races. This rules may be varied at local fleet level.
18.2 No ballast shall be carried by the crew.
19.1 Advertising on boats is not permitted (as per category 'A' of the I.S.A.F advertising code).