Ross 930 Owner's Association
Class Rules For One Design Keelboat Racing

August 1st 1996

Contents

All boats will be in the spirit and intent of the class.

  1. Drawings

    1. All yachts shall conform in all respects to the drawings of the Murray Ross 930 design except where these rules specifically allow departure from the drawings.
    2. All boats shall be constructed from the Ross 930 moulds. (i.e. hull, deck and keel mouldings.) The only exceptions are the wooden boats registered before 1 July 1989.
    3. The silhouette must be preserved as drawn.
    4. The class lay-up sheets must be adhered to during building.
    5. There will be no filling or fairing of hulls other than for cosmetic purposes.

  2. Interior Arrangement

    Accommodation must be of comfortable cruising standard. While the actual layout need not follow the designers plans, the following are minimum requirements:

    1. Five full-length berths with squabs - minimum 75mm thick.
    2. Minimum 2-burner stove for cooking, fitted to operate safely at sea.
    3. Marine or properly fitted chemical toilet.
    4. Built-in galley with a built-in sink and a total bench top area of not less than 0.29 sq. m. (3 sq. ft) with storage underneath.

  3. Weight Restriction

    The minimum weight shall be 2200 kg in sailing trim.

    Equipment allowed in this weight will be restricted to:

    Mast, boom, spinnaker pole, rigging (fixed and running excepting spinnaker sheets), main on boom (no other sails), stove (no gas bottle), squabs (as per Rule 2(a) above) or 5 lead weights, each 7kg, attached to the geometric centre of each bunk top (to enable owners to choose between upholstery or fixed weight when class racing), floor boards, bunk boards, companionway, toilet, outboard and fuel (max 10 litres), water tanks sufficient for a minimum of 40 litres (empty), fitted electrical equipment (stereo, VHF, depth sounder, log etc) and a maximum of two 11 plate batteries fitted and mounted in accordance with Category 4 requirements which must remain on board when racing under Class Rules.

    Boats under weight shall be brought up to weight as follows:

    Up to 100kg of the extra weight shall be placed:

    1. Above the waterline and
    2. 50% forward of the mast and touching the hull on either side (ie half of the 50% on each side).
    3. The remaining 50% must be fixed aft of the cabin top against the hull on either side as in (b) above.

    The balance of make-up weight, if any, shall be fastened so that not less than 50% is in the forward anchor locker and the remainder is in the aft cockpit lockers.

    No boat may be brought up to weight by "overbuilding" of internal furniture or framing. This judgement shall be left to the discretion of the measuring committee. The approval of the committee should be sought prior to undertaking work to avoid later embarrassment.

    All make-up weights must be stamped with the association imprint and be available for inspection at all times.

  4. Engine

    The auxiliary engine should be an outboard motor of not less than 8 horsepower and must be carried in an operable position in the outboard well as provided in the Ross 930 standard plan.

    An optional inboard engine may be fitted. This must be a diesel engine of minimum 8 horsepower and with a minimum weight of 110kg. The engine must be installed aft of the rear bulkhead and have a fixed shaft or leg through the hull.

  5. Sails

    1. Maximum number of sails and permissible cloth types for racing shall be as follows :-
      • 2 only jibs (Constructed of Dacron*, carbon fibre cloth, aromatic polymides and combinations thereof, excluding Spectra or similar materials).
      • 1 only heavy weather jib (Dacron*)
      • 1 only storm jib to NZYF specifications (Dacron*)
      • 1 only trisail (Dacron*)
      • 1 only mainsail (Dacron*)
      • 1 only maximum spinnaker (Dressed woven Nylon)
      • 1 only small spinnaker (Dressed woven Nylon)

      • *Dacron, Terylene or other brand names of the same material.

    2. Sail Measurements :

      Dimensions for all sails are according to the Ross 930 Standard Sail Plan as follows, measured with sails spread flat. Working sails will be measured with 5 kg loading on the luff and foot.

      1. Mainsail
        Luff 11.073m maximum
        Foot 4.267m maximum
        Leech 11.887m maximum
        Mid-girth (measured at 1/2 luff 1/2 leech) 2.694m maximum

        Battens (4 only)

        Top batten Full length (Detailed Top Batten Pocket specification below)
        3 short battens 1.066m maximum each are to be evenly spaced between top batten and clew (+/- 75mm at centre of pocket opening).

        The leech between battens will be a straight line +/- 20mm.

        Top Batten pocket specification - 1.50m maximum measured from centre of batten pocket at leech to centre of pocket at inside of bolt rope Top batten position, measured from top inner edge of headboard to top edge of batten pocket opening :-

        luff 2.59m minimum
        leech 2.40m minimum
      2. Jib
        Luff 8.991m maximum
        Leech 8.077m maximum
        Foot 3.124m maximum
        Mid girth measured at (1/2 luff 1/2 leech) 1.725m maximum, 1.625m minimum

        Battens (4 only)

        Top Batten Full length (Detailed Top Batten Pocket specification below)
        Plus 3 Battens Evenly spaced along leech between the top batten and the clew (+/- 50mm at the centre of the batten pocket opening).

        The leech between battens will be a straight line +/- 20mm.

        Top Batten pocket specification - 0.765m maximum measured from centre of batten pocket at leech to centre of batten pocket at inside of bolt rope. Top batten position, measured from the top of the head ring to the top edge of the batten pocket opening:-

        luff 1.676m minimum
        leech 1.60m minimum
      3. Maximum Spinnaker
        Luffs 10.439m maximum, 10.287m minimum
        Foot 6.248m maximum, 6.148m minim
        Width 6.248m maximum, 6.148m minimum
        Clew angle 110 degrees
      4. Small Spinnaker
        Luffs 9.753m maximum, 9.601m minimum
        Foot 4.876m maximum, 4.776m minimum
        Width 4.876m maximum, 4.776m minimum
        Clew angle 110 degrees
      5. Heavy weather jib
        Luff 6.553m maximum
        Leech 5.334m maximum
        Foot 2.667m maximum
        Battens None
    3. All head sails may only be set hanked to the forestay. No head foil systems may be used.
    4. All sails must carry the Association's stamp beside the sail maker's mark. Unstamped sails will be liable for protest.
    5. Class sail insignia is compulsory on the mainsail as per the Standard Sail Plan.
    6. Sail Controls :

      Sail controls , excluding sheets, halyards, leech and foot cords and reef lines, are restricted to the following:-

      1. Mainsail : boom vang, luff and leech Cunningham, foot outhaul, mainsheet traveller adjustment and topping lift. Main sheet traveller - maximum length of track (measured between stops) to be 1.60m. Track to be located as shown on the Ross 930 Standard Plan.
      2. Headsails : clew-board adjustment, one luff Cunningham and headsail traveller adjustment. Headsails will be self-tacking. Headsail traveller - maximum length of track (measured between stops) to be 2.08m. Track to be located as shown on the Ross 930 Standard Plan.
      3. Spinnaker : Topping lift and downhaul. Barber-haulers are allowed on both sheet and guy.

      No hydraulic controls will be allowed.

  6. Spars

    The rig dimensions and mast position on the boat shall conform in all respects to the Ross 930 standard plan.

    Spars shall be manufactured from aluminium alloy only and shall conform to the following restrictions:

    1. Mast

      For all masts made after 1.7.89

      Size Size of section shall be a minimum diameter of 104mm in the fore and aft plane including sail track to within 1900mm of the top of the spar. The minimum transverse dimension shall be 70mm to within 1900mm of the top of the spar.
      Taper The top of the spar to be not less than 66mm fore and aft including sail track, and 44mm transverse. Tapering to be such that there is no hollow in the fore and aft or transverse profiles.
      Weight Weight of the mast section to be not less than 2.42kg/m.
      Spreaders There shall be 2 pair of spreaders positioned as shown on the Ross 930 Standard Plan. Dimensions shall be in strict accordance with the plans.

      Bottom spreader rake aft to be 25 degrees. Top spreader to be 24 degrees.

      Note: Bottom spreader lengths should equal the chain plate distance from the centre of the mast.

    2. Main boom

      The boom will be constructed of 127mm diameter x× 16gm rolled section minimum excluding track. All measurements to be as per the Ross 930 Standard Plan.

    3. Spinnaker pole

      One only spinnaker pole shall be used at any one time. The length of the pole shall not exceed 3.85 m, measured with the pole on the mast and against the forestay, taken from the face of the mast to the bearing surface for the brace at the outer end of the pole.

  7. Standing Rigging

    1. Standard rigging is restricted to and shall comprise all of the following as shown on the Ross 930 standard plan.

      Side Cap Shroud rod or 1×19* 5mm minimum diameter
      Intermediate rod or 1×19* 3mm minimum diameter
      Lower rod or 1×19* 5mm minimum diameter
      Chicken Stay rod or 1×19* 5mm minimum diameter
      Fore stay rod or 1×19* 5mm minimum diameter
      Back stay rod or 1×19* 3mm minimum diameter
      Running back stays (with runner check stays optional) rod or 1×19* 3mm minimum diameter

      *It is recommended to use discontinuous rigging for the cap shrouds and intermediate stays, in which case the minimum diameters shall be:

      D3 and V2 rod 5mm
      V1 rod 6.5mm
    2. With the exception of the runners and the backstay, no shrouds or stays are to be adjustable while under sail.
    3. Chain plates are to be positioned as shown in the Ross 930 standard plan with a rake aft of the cap shroud, intermediate shroud and check stay chain plates of 25 degrees from the mast base.

  8. Halyards

    Halyards shall be restricted to a maximum of:

    • 1 jib halyard.
    • 1 spinnaker halyard.
    • 1 spinnaker pole topping lift.
    • 1 main halyard.
    • 1 main topping lift

  9. Electronics

    Electronics for class racing shall be restricted to boat speed, log, echo sounder, radio receiver, VHF radio, GPS, wind speed and direction.

  10. Keel

    1. The Keel

      The keel will be a fixed keel, positioned strictly as shown on the Ross 930 standard plan with the trailing edge of the keel being a straight line at right angles to the water line and positioned 4.470m from a plumb line off the transom. The keel dimensions are:

      1. Fore and aft: Top (against hull) 1025 - 1055mm
          1.30m down from hull 740 - 760mm (measured down trailing edge)
      2. Thickness Top (against hull) 110 - 120mm
          1.30m down from hull 80 - 90 (measured down trailing edge)
      3. Thickness Weight of lead 726 - 794kg excluding bulb

      The keel profile, in a thwart-ship plane, will be an even taper from the top to the bottom and must fit the class templates. No hollows in the taper or flare at the bottom is allowed, other than normal fairing onto the bulb.

    2. The Bulb

      All class Ross 930's shall have a bulb on the keel. The bulb dimensions are:

      Length 1.05m maximum
      Diameter 0.18m maximum
      Weight 115 -120kg

      All bulbs and keels must be weighed and measured by the class measurer prior to fitting.

      The overall length of the keel including the bulb, shall not be more than 1580mm when measured from the hull to the deepest part of the bulb.

      Boats built prior to 01/07/89 should bring their keel dimensions up to these measurements where possible in the interests of class uniformity.

      Any keels made after 01/07/89 must be to the above specifications.

      The finished keel, bulb and deadwood, (including fairing and keel bolts) ready to fit to the boat, shall not exceed 940kg.

    3. Ballast

      Apart from makeup weights as specified in these rules, the installation of any equipment that would facilitate the use of water ballast or any other form of moveable ballast is expressly prohibited.

  11. Rudder

    The rudder shall be stern hung as per the Ross 930 standard plan and conform to the original shape except that:

    Width 410mm +/- 5mm
    Thickness 60mm +/- 5mm
    Depth Extend the hull run in a straight line aft across the rudder. No part of the rudder shall extend below a line parallel to the transom at 1520mm below the extended run line.
     

  12. Lifelines

    Each boat must be equipped with a pulpit and lifelines to conform to NZYF Category 3 safety requirements. Pulpits, pushpits and stanchions to be of stainless steel only.

  13. Safety Equipment

    All yachts to comply with NZYF Category 5 unless otherwise specified in these rules.

  14. Measuring

    Three measurers will be appointed. The 3 appointed measurers may board yachts before and after racing to check weights and safety equipment etc. Failure to comply with the Ross 930 Association Official Certificate and/or safety requirements will result in automatic disqualification.

    In the case of any protest under these rules the committee shall, for a fee, appoint 2 of the measurers to check the alleged discrepancy. The measurers shall report back to the committee for appropriate action, refunding the fee if the protest is upheld.

  15. Registration

    Registration of Ross 930 yachts deviating from the design drawings, but not from the spirit of the Class, will be solely at the discretion of the committee. Any such deviation on boats built prior to 01/07/1989 should be checked and approved by the committee.

    No deviations on any vessel built after 01/07/1989 will be permitted.

  16. Certificate

    Each yacht conforming to these rules will be issued with a Certificate of Registration which will be valid for a maximum of 12 months.

    In order that this Certificate can be issued, the owner of the Ross 930 in question must be a fully paid up member of the Ross 930 Owners Association. If membership lapses, the Certificate is invalid.

    This Certificate will include details of make-up weights to be carried (number, weights and placement) and any other extraordinary details which may have affected it's measurement, or which may have been approved by the committee in accordance with rule 15 above.

    This Certificate must be carried on the boat at all times and be available for inspection by the measurers.

    The association shall keep a register of yachts over Class minimum weight which are permitted to race without squabs.

    The onus for obtaining this Certificate, re-validating a Certificate, or applying for dispensation to race without squabs following any alteration to a boat is the responsibility of the owner.

  17. Crew

    When racing as a Class during which these rules shall apply, the crew will be restricted to a maximum of 7 members (12 years of age and over).

  18. Disputes

    In any disputes arising out of the interpretation or implementation or use of these design rules, the decision of the Ross 930 Committee shall be final.

  19. Matters Not Provided For

    These shall be determined from time to time, as necessary, by the Committee, but shall be confirmed or rejected as provided in the Class Constitution not later than the next Annual General Meeting.

  20. Associated Documentation

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