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Jan Adsten, 2002-05-07 / Doc file: IceOptimist1
Ice Optimist, class-rules.
Approved by IDNIYRA Europe 2002-04-21
1. Fuselage - construction and design is optional, maximum length 3000 mm including hardware, the width is optional. Material, wood or laminate. Fuselage must have sufficant flotation capacity. A complete Ice Optimist must float in open water. Steering - optional construction, technically acceptable, without looseness. Minimum weight including hardware 12 kg.
2. Plank - maximum length 2000 mm, maximum width 180 mm. Material optional; metal pipe, wood or laminate.
Minimum weight including hardware 5 kg.
3. Sail - as Optimist class, the cloth is optional.
4. Mast, boom and sprit - the same as Optimist class.
5. Rigging - one forestay and two sidestays, possible to adjust. Number and type of sheet blocks is optional.
6. Runners - the length can be shorter than DN-class runners,
but not longer. Minimum runner thickness 3mm. Steering runner must have parking brake. Front end of runner smoth rounded not less than radius 15 mm. Front edge above ice rounded not sharp,
to prevent a sailor from being cut in a collision.
Jan Adsten, 2003-02- 13 / Doc file: iceoptimist2003update
Comments added to the class rules, as improvements and safety requirements.
(Comments added 2003-02-13)
Fuselage should be painted in contrasting bright colours (not white or gray). Registration numbers on the fuselage 80 - 100 mm high, starting from the mastfoot, in contrast with the boat colour.
Maximum lenght of fuselage, close to 3000 mm is recommended.
The hand grip of the tiller should be firm enough not to be broken and in that way be sharp and injure the sailor, instead the tiller should be released at the steering post in case of a collision or a sudden stop in an icecrack. ( Se picture on next page ).
Sail needs to be stronger than on the Optimist dinghy. The cloth must be at least 190 g/m² and the fittings on the sail more rigid. Reinforcements in corners are necessary, se below.
Recommendation for the sailmakers. (by Jüri Saraskin)
1. Take sail layout from existing Optimist sail. Usually layout is properly optimised and you can save sailcloth, using tested layout (measures of the pieces of sail).
2. Reduce amount of mould-cut on seams twice.
3. Luff offset 5-7 mm, 115 cm from tack.
4. To avoid loose-footed sail, foot curve max 50 mm to make the bottom flat.
5. Use Rutgerson SR12 or SR14 on clew and top corners. Take care of patches, strong and long enough (use radial up to lower batten)..
6. Sail window for starting should be 40 -50 cm from the foot.
7. Max rouch should be on top batten (app. 175 mm), concavity 7-8 mm between battens.
8. Use Polyant All-Purpose blade 200 AP MT0 (because of the long boom).
Note, a special made Ice Optimist sail for ice boating will not measure in for soft water sailing.
These comments made at the Junior Programme seminar in Sweden, 15-16th of november 2002, will be added to the class rules as "comments" ( like; Interpretations of the Official Specifications for DN).
Jan Adsten, 2003 02 13
Safety release for tiller. The tiller is allowed to slide forward and then be hanging in the mainsheet.
The drawings are produced by Jan Adsten and were approved by IDNIYRA Europe 21/04/2002
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