The purpose of these rules and the official drawings is to secure that the boats are as similar as possible with respect to the form and weight of the hull, rudder and the keel, the size and layout of the sails, the mast, boom and rigging and other details that influence the performance of the boat.
The highest authority for the class is the Danish Grinde Club – upon approval of Dansk Sejlunion (Danish Sailing Federation).
A change to the class rules is only possible when agreed at a general assembly as stated in the statutes for the Danish Grinde Club.
All boats must be build in agreement with the original drawings by Peter Bruun, and cast in the same or identical moulds. Peter Bruun’s original drawings are:
Rigging and sail
with respect to the accomodation the following apply:
The accommodation must be carried out as shown in the drawings from the producer, approved by the Danish Sailing Federation, or as an accommodation that in weight and placement of weight is equivalent to a standard accommodation having as a minimum:
Minimum 4 permanent berth, 2 in front of and 2 abaft the mast bulkhead, min. 1900 x 600 mm., sharpening. The four permanent berth must be made of marine plywood, hard wood or similar, and cannot be substituted by berth in canvas.
Permanent pantry with cooker, cabinet and drawers for cooking equipment and service. Further a permanent sink with water pump, fresh water tank and drainage must be in place. A permanent place for navigation with a table. Permanent cabin table. Permanent mounted toilet, wardrobe and chest drawer.
The main bulkhead and other parts important for the construction, including e.g. the floor must be made of 16 mm thick marine plywood or 12 mm thick hard wood. Accommodations that deviate from the approved drawings must be inspected and accepted by the board of the Danish Grinde Club. If the majority of the board cannot approve the accommodation as in agreement with the above, the decision of the board is final and cannot be appealed.
Hull, deck and rudder must be in accordance with the official drawings and instructions cf. § 4.
The maximum free-board height is 98 cm, measured at the point of the maximum width of the boat.
The keel must be made of cast iron. The weight must be 1.630 kg +/- 45 kg.
The engine must be permanently installed and carry a net weight not lower than 100 kg. If an engine is installed with a lower net weight, compensation weights must be placed under the cockpit bottom to a total of weights and engine of 100 kg.
- The mast must pass through the cabin roof (dog house roof), and stand on the keelson as delivered standard from the builder.
- The mast must be made of light metal (aluminium) with an ellipsoid profile and carry a weight of 3,9 kg per. meter.
- A black mark minimum 20 mm wide must be painted and placed with the lower border 10,000 mm over the upper border of the boom. A painted black mark at least 20mm wide must be placed on the aft of the mast at the upper border of the.
- The shrouds (wire-rope) must be minimum 6 mm stainless steel cablesi 1/19 wire, aft under shroud and the baby shroud at least 5 mm.
- The cross-tree must be fixed with a length of 920 mm +/- 10 mm measured from the centreline of the mast.
- The boom must be made of light metal (aluminium) with an ellipsoid profile and permanently mounted.
- A painted black mark, minimum 20 mm wide must be in place with the inner border maximum 3000 mm from the aft edge of the mast, measured with the boom at a 900 angle at the mast.
The spinnaker boom must be maximum 3.720 mm long measured according to the instructions in the Dansk Handicap rule.
Jockey stick, double forestay, forestay profile, rollgenua and two jib-halyard is allowed. Choice of pulpit type, reefing system and sheet and fairleads is free. Hydraulic adjusting of the rig is not allowed. If a forestay profile is used, the distance from the clew to the luff rope measured at a 900 angle of the luff (LP measure), must be reduced by the double of the larges width of the forestay profile.
Sail Mainsail Batten. Maximum 5 battens is allowed. The length of the batten must in no place exceed the maximum width of the main sail. The battens must not pass the leech of the sail. No adjustment of the length of the battens is allowed except what is possible with the normal lacing. The battens must be evenly distributed along the length of the leech.
The headboard measured at a 900 angle at the aft of the mast must not exceed 150 mm.
Main sail width at 1/2 height (MGM) max 1.960 mm.
Main sail width at 3/4 height (MGU) max 1.160 mm.
The Main sail must have nationality marking, number and the Grinde logo and/or.
Perpendikel (LP) 5.550 mm (se § 12)
The luff length (Tmax) 11.220 mm (J) 3.720 mm
Maximum half width (JHW) 2.580 mm
Both symmetrical and asymmetrical spinnaker is allowed.
For symmetrical spinnaker:
Largest side rope (SL) is 11.220 mm
Largest under rope (SF) and halfwidth (SMG) is 6.660 mm
The clew angle siderope/underrope must not exceed 110 degrees.
For asymmetrical spinnakers:
Largest luff (SLU) is 12.100 mm.
Largest leech (SLE) is 9.900 mm.
Largest halfwidth (SMGA) is 6.660 mm
The following sails is the maximum number allowed for racing (with measures not exceeding those indicated in the sail drawing):
4 genoa min i 193 gr. canvas
1 reacher/drifter min 60 gr. canvas
2 spinnakers min 40 gr. canvas
2 mainsail min 250 gr. canvas
1 storm jib
The main sail must be made of woven canvas.
Genoa and jib must be made of wowen canvas and /or laminated material of fiberthred and polyesther film (Mylar). The canvas fibers must be polyesther however, Pentex thred in allowed. High odolus fibers such as Kevlar (Aramid). Spectra, Vectran and carbon based material is not allowed.
The number of crew at class championships
The number of crew at championships is 4
Handicap rule: The handicap rules of Dansk Sejlunion (Danish Sailing Federation) is in operation for all Grindees racing at any time (in Denmark).
Grinde certificate must be on board when racing. The certificate is issued by Dansk Sejlunion (Danish Sailing Federation).
All standard equipment must be present during racing and measurement. Further all equipment must be ship shape and acceptable for both leasure sailing and racing.,
Sea railing with nose and sternpost pulpit minimum 600 mm over deck.
1. 1 anchor min 12 kg
2. 3 m anchor chain, 7 mm or equivalent.
3. 30 m anchor line (polyester) minimum 12 mm in diameter, or material with similar strength.
4. Lifebuoy (horse shoe) with whistle and light
5. A life jacket per crew member
6. A life line per crew member
7. A bucket with line
8. A seaworthy compass.
9. A certified fire extinguisher, minimum 2 kg and a fire rug.
10. A fog horn.
11. Navigation lights.
12. Radar reflector placed in the rig at least 1400 mm over deck.
13. 2 red and 2 white rockets.
14. Boat hook
15. Rescue Ladder.
16. First Aid Box
17. Wire cutter.
18. Leak corks
Accepted at the general assembly 13-04-07