Adams Ten Class Rules

ACN 232 3640


1.10 The Adams 10 Metre Yacht was conceived as a one design yacht suitable for harbour and ocean racing as well as family cruising.

1.20 The Class Rules are designed to preserve these characteristics and to control the cost of ownership through strict one design rules so that when competing as a one design class all boats will be essentially equal and racing will be a test of sailing ability above anything else.

1.30 When considering anything in connection with the yacht or its sails or equipment which is not clearly covered by the plans, specifications and/or Rules, it must be assumed illegal unless prior approval has been obtained from the Association.


2.10 For admission to the Class,

2.11 A yacht must possess an official measurement certificate, the original of which must be registered on file with the Adams 10 Metre Yacht Association Inc. Should a yacht fail to comply with Class Rules, the Association may, in exceptional circumstances, grant an official measurement certificate to such a yacht.

2.12 At least one owner of the yacht must be a financial member of the Association.

2.20 It is the responsibility of the owner(s) to obtain an official Measurement Certificate.

2.21 Blank Measurement Certificates are to be obtained from the Secretary of the Association and are to be completed in triplicate at the request of the owner(s) by the Association Measurer.

2.22 The original is to be signed by the Association Measurer and filed with the Association.

2.23 The duplicate is to be signed by the Association Measurer and retained by the owner(s).

2.24 The triplicate is to be filed by the Association Measurer.

2.30 The registration fee is $100.00 and is payable upon application for measurement.


2.40 A Measurement Certificate is not invalidated by a change of ownership.

2.41 It is the responsibility of the new owner(s) to apply for a Change of Ownership Certificate from the Association by letter endorsed by the vendor(s).

2.42 Changes of ownership will be registered for a fee of $10.00 payable on application.

2.50 A Measurement Certificate is invalidated by any structural alteration to a yacht or if any repair has to be undertaken which could affect any of the measurements described in these rules.

2.51 The fee for remeasurement of a yacht previously registered is to be
$100.00 payable on application for remeasurement.

2.60 The Secretary is to keep a register of all yachts which is to include a record of each yacht’s performance.

2.61 Owners are to be encouraged to submit details of yachts’ performances, supported by photographs as appropriate.


3.10 The hull/rudder/keel of any yacht will be built from approved moulds as verified by the Adams 10 Metre Association Inc.

3.20 Deleted.

3.30 The keel weight and dimensions are to be as shown in Appendix F.

3.31 The keel shall be made from the A10 association mould and the maximum weight shall not exceed 1750kg.


3.32 The dimensions are subject to a tolerance of ± 15 mm in fore and aft dimension and draught.

3.33 The shape shall be measured by the use of 3 templates developed from the original design possessed by the Association.

3.40 The dimensions and shape of the rudder are to comply with design and meet a minimum weight requirement of 17 kg, including gudgeons.


4.10 The deck, traveller bridge and cockpit are to comply with the drawing at Appendix A for the Adams 10 Metre with an allowance of ± 13 mm on each side of the measurements detailed thereon.

4.20 The cockpit seats for the Adams 10 Metre are to be of slatted timber as detailed on the drawing at Appendix E, or alternatively, be of moulded G.R.P. as per authorised moulds.

4.30 The basis for mimumal internal fitout will be as per the authorised moulds. Nevertheless, boats built prior to 1986 can remain to individual requirements, conditional upon achievement of minimum weight.



5.10 The spars and standing rigging are to be in accordance with the drawing at Appendix A for the Adams 10 Metre.

5.20 The spars and standing rigging are to be of the materials stated or other materials of similar strength and characteristics. Exotic materials are not permitted.

5.30 Where absolute measurements are stated the tolerances are ± 13mm, but where minimum or maximum measurements are stated there are no tolerances.

5.40 The mast is to be aluminium section 150 mm x 110 mm x 3.35 kg per metre including mainsail bolt rope track. The taper is to be as shown on the drawings at Appendices C & D.

5.50 The boom is to be aluminium of maximum depth of 152 mm.

5.51 The top of the boom is to be 965 mm above the sheer for the Super 10 Metre.

5.60 The length of each of the spreaders is to be 952mm from the centreline of the mast to the tip for the Adams 10 Metre.

5.61 The spreaders are to be swept back from the fore and aft centreline.

5.70 The forestay and shrouds, caps and lowers are to be 7/32” or 6 mm, 1 x 19 stainless steel. The forestay is to be fixed, but the backstay may be adjustable.

5.71 The eye on the chainplate for the forestay is to be located 832 mm behind the bow and 3.556 m forward of the front wall of the mast (J, base of fore triangle, measurement).

5.72 The eyes on the chainplates for the shrouds, caps and lowers, are to be located 508 mm behind the front wall of the mast, 838 mm from the fore and aft centreline for the Adams 10 Metre.

5.73 The forestay and cap shrouds are to meet the mast 10.516 m above the sheer (I, height of fore triangle, measurement). The spreaders and the lower shrouds are to meet the mast 5.740 m above the sheer measured from the same position.  

5.74 The spinnaker pole is not to exceed 3.727 m in length and is to be secured to the mast at maximum height of 2.819 m from the sheer.



Sails shall be constructed and measured in accordance with the I.Y.R.U. Measurement Instruction except where otherwise specified. They shall be measured in a dry state and laid on a flat surface with just sufficient tension to remove wrinkles across the line of the measurement being taken. All measurements shall be taken as a straight line.



The term sail shall be taken to include the headboard, tabling, bolt ropes or tapes. It shall not include cringles which are wholly outside the sail. The term luff shall be determined by the distance between the head and tack as defined in the abovementioned rules. The term corner shall be determined by the actual physical corner of the sail as defined above.

6.21 Exotic materials are permitted in the No.1 Headsail, No.2 Headsail and only Dacron may be used in the Mainsail and No.3 Headsail, as a sail or as a reinforcement and tabling. Two (2) ply sails are permitted. A two ply sail is defined as one in which the body of the sail comprises two layers of cloth of equal weight. Reinforcements of a two ply sail beyond the limit of 150 mm plus 7% of the luff length shall comprise not more than one further layer of cloth, also of the same weight as the body of the sail. Existing measured sails may be used.

6.22 Double luff sails. Sails passing around a stay or spar and attached back on themselves by stitching, zipper or similar device are prohibited.




(a) Each sail shall be passed by an official measurer who shall sign and date the sail near the tack in indelible waterproof marking. Details (maker, serial no.) shall be entered on the Measurement Certificate by the Measurer.

6.24 USE

(a) No sails other than approved Headsails, Mainsail and Spinnakers shall be used, and only one of each of these shall be hoisted at the same time.

(b) No more than three headsails, one No.1 and one No.2 and one No.3, one mainsail and two spinnakers shall be carried on board while racing.

(c) At sanctioned regattas, no more than one mainsail, one No.1, one No.2 and one No.3 headsails and two spinnakers shall be presented for measurement, and the same sails measured shall be the only sails used at the regatta. A regatta is defined as an event sanctioned by a national or higher authority at which sails may be measured and the sail acquisition records inspected.

(d) The borrowing of sails is prohibited for use in sanctioned events with the exception that if a sail has been lost or destroyed, the helmsperson or owner may apply to the Committee to allow the replacement of the lost or destroyed sail.


6.25 Not in use.

The length of batten pockets shall be the maximum inside dimension, ignoring the effect of any elastic or other retaining devices.

The sail number, letter(s) and class emblem shall be placed in accordance with I.Y.R.U. Yacht Racing Rule 25. Letters and numbers shall be of the following dimensions:

  • Height 380 mm
  • Thickness 50 mm
  • Width 250 mm (excluding number one and letter)
  • Space between adjacent letters and numbers: 75 mm





(a) Head -The head shall be taken as the highest point of the sail projected perpendicular to the luff or its extension.

(b) Clew- The clew shall be taken as the straight line intersection of the leech and foot. Ignoring any cut outs to accommodate outhaul fittings.

(c) Tack -The tack shall be taken as the straight line intersection of the       luff bolt rope and the foot.


(a) Leech-The length of the leech measured in a straight line from the forward upper corner of the headboard to clew intersection shall not exceed 12725 mm.

(b) Cross Width-The point from which the cross width measurement is taken shall be determined by folding the forward upper corner to the clew then the forward upper corner to the half fold.


  • Half Height measurement 2485 mm max.
  • 3/4 Height measurement 1525 mm max.


      For the purposes of this measurement any hollow in the leech shall be bridged with a straight line.

(c) Sail to be loose footed

(d) Battens No more than four (4) battens shall be permitted, spaced at equal intervals + 01—100mm along the after edge of the sail.


  • The top batten shall not be closer than 2438 mm from the top aft edge of the headboard and shall go through to the luff.
  • The two middle battens shall not exceed 1295 mm.
  • The bottom batten shall not exceed 952 mm.
  • The opening into each pocket shall not exceed 175 mm.

(e) Cunningham tackle is permitted to adjust the tension of the luff only.

(f) Headboard The maximum breadth of the headboard measured perpendicular to the luff shall not exceed 152 mm.

The after corner of the headboard shall not be higher than the forward corner.

(g) No part of the sail shall extend above the lower edge of the upper mast measurement band or beyond the forward edge of the boom measurement band.

L.P. Measurement

No.1 Headsail Max 5334 mm Min 5184mm

No.2 Headsail Max 4267mm Min 4117mm

No.3 Headsail Max 3200mm Min 3100mm

No.3 Headsail may have three (3) battens spaced evenly and no leech round is permitted.

Shall be constructed of woven nylon cloth. No laminates are allowed.
General: The spinnaker shall be symmetrical in shape and construction about its centreline. Fittings shall be limited to head swivel and corner cringles or rings.


Head The head shall be taken as the straight line intersection of the two luffs ignoring any hollow or round to the luffs.

Clew The clew shall be taken as the straight line intersection of the foot and luff ignoring any round of the foot and clew

Max luff length 10439mm
S.M.W. 6706 mm

6.40 The storm jib is to have a maximum dimension measured at right angles to the luff of 1.83m and a maximum luff length of 6.045 m.

6.50 The dimensions of the spinnakers, which are to be fabricated from material of minimum weight of nominal % oz per lineal yard 28” wide, are to be as follows:

6.51 Maximum width 6.706 m, whether measured direct from tack to clew or at any points from side to side equidistant from the head.

6.52 Maximum height 10.439 m measured around the edges from head to tack or clew.

6.53 Minimum mid-girth 75% of measurement direct from tack to clew, measured direct across the sail from midpoints on the height of luff and leech.

6.54 The maximum enclosed angle at each of the dews is to be 120 degrees.

6.60 All sails are to comply with specified maximum dimensions when first measured and need only be submitted for remeasurement in the event that repairs require the replacement of entire panels.


7.10 The minimum weight of an Adams 10 Metre Yacht to comply with the official Measurement Certificate shall be 2843kg. When presented for weighing, an Adams 10 Metre Yacht shall be dry and shall have on board:

(a) Full racing fit out which will consist of deck hardware, mast, boom and spinnaker pole.

7.20 The following are to be removed before weighing:

(a) Not including deck hardware everything that is not permanently fitted to the boat.

7.30 The measurer is to note any items such as larger-than-required motors, fuel tanks, batteries and anchors on the vessel’s Measurement Certificate.


7.40 (a) Every Adams 10 yacht constructed after 1982 shall be weighed once after construction and before placement of weight added so as to achieve minimum weight.

(b) if upon weighing, the yacht is found to be underweight, additional weight necessary to achieve minimum weight shall be placed as follows:


50 kg on top of the keel


as to the balance:


25 percent on the centre line of the yacht on the forward most bulkhead,

25 percent on the centre line of the yacht at the junction of the transom and the aft ring frame or fuel tank locker.

25 percent on the starboard chainplate bulkhead at the junction of this bulkhead and the deck

25 percent on the port chainplate bulkhead at the junction of this bulkhead and the deck


(c) Such weights by this rule need not be permanently affixed to the yacht but must be carried during every Adams 10 race, regatta or championship. A race committee may require a declaration from the helmsman of any yacht that this rule has been observed.


All running rigging, deck gear and instrumentation are to be to the owner(s) individual requirements.


9.10 Each yacht is to be equipped with an inboard or outboard motor of at least 5 H.P. rating.

9.20 Motors are to be in operable condition at all times.

9.30 Outboard motors are to be of the Iongshaft type.


Hydraulic devices.

10.20 Additional mast bonding devices, other than the adjustable backstay, mainsheet, boom yang and adjustable blocks at the collar in the deck around the mast.

10.30 Through-deck spinnaker launches.

10.40 Running backstays.

10.50 Coring, drilling out, rebuilding, replacing materials, grinding, relocating or otherwise tampering with standard equipment to reduce weight below the minimum specified, to improve moments of inertia, to change standard shapes or for any other reason.

10.60 Circular track boom vang devices.



11.10 All races conducted by or on behalf of the Association shall be conducted under the current Racing Rules and Safety Regulations of the Yachting Association of New South Wales and the appropriate Class Association Special Rules, all as modified by the Sailing Instructions.

11.20 Entries to participate in State and National Championships must be received on the prescribed form no later than the date fixed by the Committee, from owners and owners nominating a helmsperson, who shall satisfy the following rules regarding eligibility:


11.21 The owner shall be a current financial member of the Association.


11.22 An owner shall not be eligible to enter a yacht in any Championship unless the owner is listed on a recognised Yacht Club Register as an owner of an Adams 10 Metre Yacht.


11.23 No helmsperson shall be eligible to participate in any Championship unless he is a member of a Club affiliated with the Australian Yachting Federation and a member of the Association and a member of the Adams Ten Class Association of Australia.


11.24 The nominated helmsman for a regatta must be a regular crew member of the boat in the season leading up to the regatta. In keeping with the spirit of amateur status of the class, the final decision on whether the nominated helmsman is eligible will be at the discretion of the Committee.

11.30 Entries for Adams 10 Metre Class Championships must nominate the intended number of crew at the time of registration of the yacht into the series and must maintain such during the series, with the penalty of disqualification. The nominated crew must include a bonafide owner or part owner of the yacht. Crew numbers in A10 class regattas must be no less than two and no more than seven. Extenuating circumstances may be considered by the committee, which may dispense with this rule.


11.31 The Committee may refuse to grant entry to a yacht otherwise eligible for entry into a championship, if in the opinion of the Committee acceptance of such entry is not in the interests of the Association.


11.32 The Committee may, on application in writing by an interested person setting out grounds for relief, dispense with any of the rules governing eligibility to enter any yacht in a Championship.









LOA: 33ft/10.058m

LWL:  31’ 1” ½ft/9.48m

Beam: 8’ 8”ft/2.64m

Draft: 5’ 9”ft/1.75m

Displacement: 2953 kg (Minimum racing weight)

Lead Keel: 1750 kg (Maximum)

Upwind Sail area:

#1 306 sq ft

#2 243 sq ft

#3 176 sq ft

Main 308 sq ft

Spinnaker Area:

Fractional: 832 sq ft