an unofficial proposed NA 20 version rules based on iF 20 RULES in 02 for comparison also -
proposed NORTH AMERICAN FORMULA 20 CLASS RULES 2002
The North American Formula 20 is a restricted class, reserved for sport catamarans, with two crew and of amateur or professional construction and destined for racing on elapsed time.
A. ADMINISTRATION OF THE RULE
A.1 AUTHORITY
The rules of The North American Formula 20 are established under behalf of The North American Formula 20 class association, which publishes the interpretations of The North American Formula 20 and recognizes them as the authorized interpretations and explanations of the rules. The North American Formula 20 class will here on will be referred to as NA-F20
A.2. ADMINISTRATION
The NA-F20 Class Association measurement committee nominates the measurers
A.3. INTERPRETATION
After having eventually consulted NA-F20 Measurement Committee, the chief measure shall give an interpretation on all points of the NA-F20. In general, what is not expressly permitted is prohibited.
A.4. REFERENCE TEXT
For the interpretation of the rules, the original text in English shall prevail over all translations.
A.5. SPIRIT OF THE RULE
In case of doubt, the intention of the rule makers, which is the spirit, shall take precedence over the letter of the rule.
A.6. DISPENSATION
For the boats constructed before 1st January 1998 dispensations, limited in duration, may be given by the Formula 20 Measurement Committee after examining the owner’s request.
A.7. AMENDMENTS
The NA-F20 Measurement Committee will propose amendments to the rule if necessary. Amendments shall be placed on one year’s notice unless it is considered essential to act immediately to prohibit or penalize an undesirable feature.
B. MEASUREMENT RULES GENERAL
For the construction, only the following materials are authorized: polyester or vinylester resin, glass fibers, sandwich of PVC or balsa or felt, the combination of wood-epoxy, injected plastic, steel, extruded aluminum profiles of constant section, which shall be not altered, other than locally for the fixings and passage of equipment and normal reinforcement.
Every material that is not expressly permitted is prohibited. Epoxy glue is permitted for joining components. For the trampoline: all types (except netting).
B.1. PLATFORM
B.1.1. DIMENSIONS
The maximum overall length measured on the hulls is 20.08 ft. excluding rudder assembly.
1.2.1. The maximum overall beam is 8.5 ft.
B.1.2. MINIMUM WEIGHT
1.2.1. The minimum weight of the platform is fixed at 308.5 lbs.
1.2.2. The minimum weight of the boat ready to sail is fixed at 4198. Lbs.
1.2.3. A corrector weight of maximum 15.5 lbs. may be used to satisfy these two conditions. This corrector weight shall be fixed to the outside of the forward beam on the starboard side and shall be removable for checking.
B.1.3. DAGGERBOARDS AND RUDDERS
The platform shall be equipped with a pair of rudders and, if fitted, a pair of daggerboards or centerboards. The daggerboards or centerboards and rudders may be using epoxy resin. Carbon may be used for the construction of daggerboards, centerboards or rudder blades.
1.3.1 Minimum weight of rudders:
The minimum weight of each complete rudder assembly comprising blade, stock and tiller is fixed at 6.6 lbs.
1.3.2. Maximum weight of daggerboards or centerboards:
The maximum weight of daggerboards or centerboards is fixed at 15.43 lbs.
Distribution of the material of daggerboard or centerboard shall be homogeneous. Ballast or mass use of whatever nature is prohibited.
B.2. RIGGING
B.2.1.THE MAST
Carbon may be used for the construction of the mast.
The perimeter of the mast shall be a maximum of 15.16 in.
2.1.3. The maximum distance between the top of the forward crossbeam and the bottom of the
upper measurement band of the mainsail shall be 32 ft.
2.1.4. The maximum distance between the bottom of the mast section and the axis of the point of attachment of the highest standing rigging shall be 20.05 ft.
2.1.5. The maximum distance between the bottom of the mast section and the point over which the spinnaker can not be hoisted shall be 28.81 ft.
2.1.6. The mast shall be watertight.
2.1.7. The mast shall have a profile of constant section
The Minimum weight of the mast is fixed at 39.68 lbs.
2.1.9. A corrector weight of maximum 2.2 lbs. may be used to satisfy these conditions. This corrector
weight shall be fixed at the top of the mast and shall be removable for checking.
B.2.2.THE BOOM
A loose-footed mainsail is permitted. If used, the boom shall be made of extruded aluminum profile of constant section.
B.2.3.THE BOWSPRIT
3.2.1. The bowsprit shall be made of any material. A headsail retrieval system may be used.
2.3.2. The length shall not be greater than distance, measured in total from its attachment point (on the mast or on the cross beam) to the forward upper theoretical point of the deck, more an additional 31.5 in..
2.3.3 The bowsprit shall be fixed and approximately on the longitudinal centerline of the boat.
B.2.4.RIGGING AND EQUIPMENT
2.4.1.The standing rigging shall be constituted at most with: 2 shrouds, 1 forestay, 1 bridle stay, 1 pair of
diamond with a pair of spreaders, 2 pairs of trapeze wires.
2.4.2. The standing rigging shall be of conventional stranded steel wire (1x19). Dyform® or similar materials are prohibited.
2.4.3. It is not permitted to adjust while racing: the rake of the mast, the tension of the standing rigging, the angle or length of the spreaders, the tension of the diamonds other than by one or two turn block’s appropriately blocklable.
B.3.WEIGHT OF CREW
B.3.1.MINIMUM WEIGHT OF CREW
The combined weight of the two crew shall be a minimum of 298 lbs.
3.2.1.There are three categories of crew weight:
(i) of 298 lbs. to less than 331lbs.
(ii) 331 to 364 lbs.
(iii) above 364 lbs.
3.2.2. The crew in the category 298 lbs. to less than 331 lbs. shall carry a weight equal to half of the difference between 331 lbs. and the actual weight of the crew. The weight shall be fixed to the outside of the forward crossbeam on the port side and shall be removable for control.
B.3.3. CHANGE OF CATEGORY
The crew in the category of 342 lbs. to less than 364 lbs. may use a corrector weight to compete in the upper category. The weight, equal to half of the difference between 364 and the actual weight of the crew shall be fixed to the outside of the forward crossbeam on the port side and shall be removable for control.
B.3.4. RESPOSIBILITY OF THE CREW
The respect of the weight declared is the sole responsibility of the crew, which may be controlled and
protested at any time during the race.
B.4. THE SAILS
THE SAIL PLAN
The sail plan comprises a mainsail, a jib and a spinnaker. The sails shall be made of a material of dacron type, or mylar® or similar and shall fit in a bag of normal dimensions. The ISAF Measurement and Calculation of Sail areas Rules shall apply.
B.4.1. MAINSAIL
The mainsail shall have a surface area of maximum 208ft² including the mast. No parts of the sail shall be above a perpendicular passing through the highest point of the halyard.
B.4.2. JIB
It shall be possible to roll the jib around the stay. The leech shall not be convex. The head shall be not more than 2 inches wide. There shall not be battens on the foot. Two sail areas of jib are available as a function of the crew weight:
4.2.1.The crew category of less than 352lbs:
Maximum jib sail area: 44.82ft²
4.2.2.Crew categories of more than 364lbs.and crews over 342lbs.changing of category (see B.3.3.):
Maximum Jib sail Area: 52.27ft²
B.4.3. SPINNAKER
Two sails areas of spinnakers are permitted as a function of crew weight.
4.3.1. Crew less than 342lbs:
Maximum surface area for the spinnaker: 249²ft.
4.3.2. Crews of more than 364lbs.and crews over 342lbs.changing of category (see B.3.3.):
Maximum surface area for the spinnaker: 270m².
Battens and stiffening devices, except textile leech lines, are not permitted.
B.4.4. SUIT OF SAIL AUTHORISED FOR AN EVENT.
A single suit of sails is authorized for the duration of an event.
B.5. MARKING
B.5.1. MARKING OF SAILS.
All the sails measured shall be marked wit a colored sticker affixed near the clew on the starboard side. The sails corresponding to different weight categories of crew weight shall be identified by following color code:
Jib Mainsail Spinnaker
44.82ft² red 208ft² blue 249ft² red
52.27ft² blue 208ft² blue 270ft² blue
5.1.2. The maximum permitted area shall be on the colored stickers.
5.1.3 The actual measured area shall be on the measurement certificate.
5.1.4.The area and the dimensions of the spinnaker (SL1, SL2, SMG, SF) shall be written in an indelible manner near the starboard tack.
B.5.2. MARKING OF CORRECTOR WEIGHTS
The weight defined in B.1.2.1. and B.1.2.2. shall be noted on the measurement certificate. Mention shall be carried near the stern of each hull, on the inward facing sides, under a transparent NA-F20 sticker.
B.5.3. IDENTIFICATION
The number of the measurement certificate corresponding with the boat shall be written by the measurer:
-at the stern of the hull, on the inward facing sides:
-at the bottom of the mast, starboard side:
-at the starboard tack of each sail.
B.5.4. CLASS EMBLEM
The mainsail shall carry the NA-F20 logo supplied with the measurement certificate. The NA-F 20 logo will be put starboard side within 1m from the clew point.
C. DEFINITIONS AND MEASUREMENT PROCEDURE
The method employed for the measurement and calculation of sail area shall be that defined in the Measurement and Calculation of Sail Area of the ISAF.
The measurements shall be taken and expressed in feet and inches, pounds and ounces.
c.1. WEIGHT OF THE CREW.
The controlled crew weight is based on the weight on the weight of the crew in swimming costume.
c.2. CONTROL OF MINIMUM WEIGHT OF THE BOAT.
c.2.1. THE PLATFORM:
2.1.1. This shall be weighed assembled, dry and clean.
2.1.2. It comprises: the hulls, the crossbeams, the trampoline, the daggerboards or centerboards, the steering system, the mainsheet and jib traveler cars, steering compass, all the equipment normally bolted, screwed or fixed in a permanent manner on the boat and used during racing, the righting system when existing, and eventually the corrector weights specified in (B1.2.3.)
c.2.2. THE MAST:
This shall be weighed assembled, dry and clean.
2.2.2. It comprises: All the equipment normally bolted, screwed or fixed in a permanent manner on
the mast and used during racing, and the diamonds with a pair of spreaders.
c.2.3. BOAT REDY TO SAIL:
The minimum weight of the boat ready to sail shall be the assembled platform conforming to rule 2.1. above and carrying the dry and clean equipment normally used for navigation: mast, boom (when exist), bowsprit, mast rigging, halyards, sheets, sails, blocks, except the safety equipment defined by Chapter E rule 2.
c.3. OVERALL LENGTH OF THE HULLS:
The overall length of the hulls, outside rudder pintles, corresponds with horizontal distance between the vertical passing through the extremity of the hulls, the boat being leveled on its waterline.
c.4. SAILS.
c.4.1. GENERAL
The intention is to establish a reliable and simple method of measuring the active surface of the entire sail plan, including the mast. In the measurement of sail area, the term sail shall be considered as defining the part of the sail outside the mast and including headboard. Crinkles that are totally outside the edge of the sail or the boltrope that is inside the mast shall not be included.
c.4.2 MAINSAIL AND JIB:
The battens shall be without tension in their pockets, the sail shall be pinned on a flat surface with the tension just sufficient to eliminate creases, then smoothed flat to give the longest dimensions.
Whilst the sail remains pinned, all the measurement necessary shall be taken, the tension should not be
adjusted.
c.4.3. MAST MEASUREMENT.
The measurement of the perimeter of the mast shall be considered as the distance, at right angles to the mast axis, measured around and back to the same point. The dimension shall be divided by two to give the value for the half-circumference.
c.4..4. SPINNAKER
4.4.1. Definition of a spinnaker
All triangular sails not complying with definition of a mainsail or a jib are spinnakers, on condition that the girth at mid-height is equal or greater than 75% or that of the foot
4.4.2. Calculation of the spinnaker CSPI:
CSPI=SF x SL1 +SL2 + (SMG- SF) x2 (SL1 + SL2)
4 2 3 2 Where SMG > 75 % of SF.
Where SF is the length of the foot measured around the edge of the sail between the lowest point of
the luff and the leech:
Where SL1 is the length of the luff of the sail, from the highest point of the sail, to the lowest point of
the sail on the luff:
Where SL2 is the length of the leech of the sail measured along the edge of the sail, from the highest
point of the sail, to the lowest point of the sail on the leech.
Where SMG is the width at mid-height, which shall be taken between the mid point of the luff and
the mid point of the leech.
CONTROLS.
d.1. MEASUREMENT FORM AND MEASUREMENT CERTIFICATE
d.1.1. COMPETENCE
Only the controls, measurements and calculations by a measurer recognized by the NA-F20 Catamaran Association, a National authority or the ISAF ( Multihull Committee) are considered valid.
d.1.2. MEASUREMENT FORM AND MEASUREMENT CERTIFICATE
The measurement form competed (measurement sheet and calculation) and signed by a measurer is not a
measurement certificate.
1.2.2. The measurer shall record on the measurement form anything he considers as departing from the
concept of the NA-F20 rule, he shall send it with detailed explanations on the contentious points to the NA-F20 Catamaran Association for a ruling.
1.2.3. The measurement certificate is issued by the NA-F20 class association responsible for the administration of the rule in the country of the owner. When after examining the completed measurement form signed by the measurer, it considers that the boat conforms to the Rules off the NA-F20.
1.2.4. A competitor has an obligation to present with his entry the measurement certificate and measurement form of his boat.
d.1.3. REGISTRATION
The measurement form (measurement sheets and calculations) and the measurement certificate are
established and registered by the NA-F20 Catamaran Association or a National Authority.
d.1.4. VALIDITY
A change of ownership shall be invalidate a measurement certificate, a re-registration shall be made by
returning to the national authority the initial measurement certificate accompanied by the details if the new owner. The valid certificate and registration will be returned to the new owner, it is not necessary to re-measure the boat.
All modifications or replacements of parts of a significant change shall be re measured and notification made on the measurement certificate by a measure recognized by the NA-F20 Catamaran Association.
d.1.5. COST OF THE MEASUREMENT
1.5.1.INITIAL MEASUREMENT:
The cost of measurement is at the discretion of the relevant National Authority corresponding with the provision of the class emblem, the marking stickers for the sail, the hulls, the mast and the establishment and registration of the measurement certificate.
1.5.2. The cost of additional measurement, marking and registration is fixed at the discretion of the National Authority.
1.5.3. The other (travel and accommodation of the measurer) are at the owner’s expense.
D.2. EVENT MEASUREMENT.
The travelling and accommodation expense of the measurer are the responsibility of the event organizer.
It is sole responsibility of the competitor in a race to maintain his boat in accordance with its certificate.
SAFETY
E.1.RIGHTING
The crew shall be able to demonstrate their capability to re-right the boat.
E.2. SAFETY EQUIPMENT
Minimum mandatory equipment to be on board;
1 re-righting line 13 feet long an 10mm of diameter minimum, 2 lifejackets (conforming to the rules in force.)
E.3. BALLAST AND WEIGHT JACKETS
Ballast on the boat or worn by crew is prohibited.
E.4. STEERING COMPASS
A fixed steering compass may be used
E.5. COMPLIMENTARY ARRANGEMENTS
REDUCTION OF SAIL AREA
If specified in the Notice of Race, the organizers may require the following complementary equipment:
Jib mounted on a roller. Mainsail equipped with reefing points not less than 39.4 in from the foot.
WEIGHT CHART NORTH AMERICAN FORMULA 20 CLASS
NOTE: CREW WEIGHT IS THE COMBINED WEIGHT OF BOTH PERSONS SAILING THE NAF-20 AT ANY GIVEN EVENT.
CREW WEIGHT IN LBS JIB SQFT SPINNAKER SQFT ADDED WEIGHT
added note --N A rules would eliminate this following long list of crew weight section and just use 2 basic boat weight categories -
-
297lbs. 44.82ft² 254ft² 16lbs
300lbs. 44.82ft² 254ft² 15lbs
301lbs 44.82ft² 254ft² 14lbs
304lbs 44.82ft² 254ft² 13lbs
306lbs 44.82ft² 254ft² 12lbs
308lbs 44.82ft² 254ft² 11lbs
310lbs 44.82ft² 254ft² 10lbs
312lbs 44.82ft² 254ft² 9lbs
314lbs 44.82ft² 254ft² 8lbs
316lbs 44.82ft² 254ft² 7lbs
319lbs 44.82ft² 254ft² 6lbs
321lbs 44.82ft² 254ft² 4lbs
323lbs 44.82ft² 254ft² 3lbs
325lbs 44.82ft² 1254ft² 2lbs
328lbs 44.82ft² 254ft² 1lbs
330lbs 44.82ft² 254ft² 0.0lbs
332lbs 44.82ft² 254ft² 0.0lbs
334lbs 44.82ft² 254ft² 0.0lbs
336lbs 44.82ft² 254ft² 0.0lbs
339lbs 44.82ft² 254ft² 0.0lbs
341lbs 52.27ft² 270ft² 11lbs
343lbs 52.27ft² 270ft² 10lbs
345lbs 52.27ft² 270ft² 9lbs
347lbs 52.27ft² 270ft² 8lbs
350lbs 52.27ft² 270ft² 7lbs
352lbs 52.27ft² 270ft² 6lbs
354lbs 52.27ft² 270ft² 4lbs
356lbs 52.27ft² 270ft² 3lbs
358lbs 52.27ft² 270ft² 2lbs
360lbs 52.27ft² 270ft² 1lbs
363lbs 52.27ft² 270ft² 0lbs
SAILORS ARE RESPONSABLE FOR TAKING THEIR OWN ADDED WEIGHT, WHICH MAY BE CONTROLLED AND PROTESTED AT ANY TIME DURING A RACE.
