Fairwind and Fairwind II 
By Kyosho

 One Design Class Rules
Version 1.0 
February 20, 2002

 


Fairwind General Class Description:
Length Overall (LOA): 900 mm 
Beam: 226 mm
Displacement: Minimum 8 lbs.
Mast Height: 1220 mm
Sail Area: 0.381 m2

1.0 CONCEPT 
The definitions, dimensions, and restrictions listed are intended to maintain the one-design concept for this class. The rules are intended to ensure that all boats are as alike as reasonably possible with regard to hull, deck, keel, rudder, displacement and rig size. It is hoped that the Fairwind will provide very close racing with a one-design yacht.

1.1 General 
The class specification is defined by these class rules, the manufacturer's kit instructions at the time the kit was assembled, and any applicable rules of the AMYA, in that order of precedence. All dimensions shown on the manufacturer's plans are to be adhered to unless specifically overridden by these rules. 

1.2 Definitions
In these rules the word "shall" means mandatory while the word "may" is permissive. 

1.2 Units of Measure
In these rules millimeters (mm) are used as the unit of length to remain consistent with the assembly instructions provided by Kyosho. For the purposes of measurement, inches can be substituted by applying the conversion 25.4mm = 1.0 in. The weight of the boat is measured in pounds (lb) since these rules override the assembly instruction regarding ballast. 


2.0 STANDARDS 
The class shall be called the "Fairwind One-Design". Boats conforming to these rules shall be assembled from a kit, herein referred to as "the kit". The kit is only that as manufactured by Kyosho of Japan and sold as a Fairwind, Fairwind II or Fairwind 900.


2.1 Hull and Keel 
The hull and keel shall be as supplied by the Kit but may be reinforced internally for collision protection but shall not be modified in any other way.

2.2 Deck and Hatch 
The deck shall remain as supplied by the kit, but new or different sheet exit guide holes may be added. The hatch cover shall be that as supplied in the kit and referred to as "the cabin" in the manufacturers assembly instructions.

2.3 Rudder 
The rudder shall be as supplied by the kit. If damaged or broken a new one should be obtained from the manufacturer. The skipper may repair scratches and other minor damage so long as those repairs do not constitute a majority of the structure of the rudder.


3.0 DISPLACEMENT AND BALLAST 
The minimum ready-to-sail race weight shall be 8.0 lbs. The ready-to-sail race weight includes radio receiver, batteries, rudder servo, sail control unit, sails and rigging. Removable ballast may be used but must conform Rule E4.7 of Appendix E of The Racing Rules of Sailing for 2000-2004 as published by the International Sailing Federation relating to Radio Control Yachts which reads: 

E4.7 Moving Ballast
Rule 51 is replaced with:

During an even and unless the class rules specify otherwise,
(a) ballast shall not be shifted, shipped or unshipped;
(b) except for replacements of similar weight and position, no control equipment shall be shifted, shipped or unshipped;
(c) the position of rig counterbalance weights may be adjusted; and
(d) bilge water shall not be used to trim the boat, but may be removed at any time.

3.1 Materials 
Ballast shall consist of a material not denser than lead and shall be in the form of shot added to the keel. As specified by the AMYA, ballast shall not be of a material that poses a hazard to the boat, other boats or the environment. Ballast that contributes to the minimum weight of the boat shall be fixed in the keel with glue or some other permanent means. 

4.0 SPARS 
The mast and booms shall be made of aluminum, fiberglass, carbon fiber or wood. Hollow spars are allowed. Any replacement spars must not exceed the dimensions of the originals provided in the kit. These maximum dimensions include end fittings. 

Maximum dimensions : 

                    Fittings attached to spars are not considered part of spars. 


5.0 RIGGING 
Running and standing rigging may use commercially available or home built fittings, fairleads, turnbuckles, screw eyes, bowsies, goosenecks, spreaders, etc. The type of line or wire used for sheets or shrouds, etc. is not controlled. Reinforcements may be added under the deck at the chainplates, backstay attachment points, sheet exit guides, and jibstay attachment point. All standing rigging shall be adjusted only by manual means.

5.1 Mast Rigging 
The original standing rigging layout shall be comprised of an adjustable, permanent backstay, sidestays, and a jibstay. Lower sidestays (as per the kit) may be omitted. A jib boom topping lift may be added. No other rigging such as jackstays or jumpers may be added to the rig. Rotating masts are prohibited.

5.2 Jib Pivot
The Jib boom shall be attached to a fixture on the centerline of the deck. The jib shall be rigged such that the jib boom does not extend beyond the bow of the boat when the jib boom is held parallel to the centerline of the deck.

5.3 Jib Counterbalance
A jib counterbalance may be used, but must not extend beyond the bow of the boat. The counterbalance is not counted as part of the jib boom for purposes of maximum length.

5.4 Mast Crane and Backstay Bracket 
The crane at the top of the mast may not be extended beyond the length of that as supplied in the kit. Maximum crane length is (55mm) when measured from the front face of the mast to the aft edge of the crane measuring parallel to the centerline of the crane.

5.5 Mast Fittings 
Different or replacement mast fittings may be used.

5.6 Wind Indicators 
The use of a wind indicator or vane on the top of the mast is allowed, and shall not be included in the restriction on mast height (see 4.0). 

5.7 Deck Layout: 
The layout of components on the deck may be modified to accommodate alternate control systems. Non-functional components such as steering column and wheels, deck railings, winches and cleats may be omitted. The cabin area may be sealed. Alternate deck fittings may be used. The fore/aft location of the shroud attachments at the deck must conform to the manufacturer's assembly instructions.

5.8 Sail Controls 
The manner in which the main and jib sheets are rigged and controlled is left to the skipper's discretion provided only 1 R/C channel is used for sail control (see 7.0).


6.0 SAILS 
(See Also APPENDIX #1 Sail Diagram and Measurements) 

6.1 Construction
Sail may be constructed of any material and may be of single or paneled construction. Molded sails are specifically prohibited.

6.2 Corner reinforcements
Broadseam reinforcements, batten pockets and battens are unrestricted as to material. Corner reinforcements may extend a maximum of 50mm from the corners of the sail. 

6.3 Attachments
Halyard, downhaul, and clew outhaul attachment points shall be placed within 25mm of each sail corner. Cunningham eyes are allowed in the sails.

6.4 Battens 
Battens may be fitted to the mainsail and jib, with a maximum of three on the mainsail and two on the jib. They shall be placed so as to divide the leach into approximately equal segments. Their maximum length shall be as per the original sail battens supplied with the kit i.e. a maximum of 95mm for the main and 65mm for the jib but may at the skippers discretion be shorter or removed. 

6.5 Measurement
Sails, when measured, shall be measured on or off the spar. Boltropes (if included on the sail) will not count as in the measurement of the sail. Foot and leach curves shall be defined by the measurement points and faired with a constant section batten connecting corners of the sail through the intervening measurement points, with no bending in the batten induced beyond the corners of the sail. The maximum dimensions of the sails are defined in Appendix #2. There are no minimum dimensions.

6.6 Sail Numbers and Class Logo 
Sail Numbers are assigned by the class secretary. Sail numbers must be displayed for all class events. The use of the class logo is optional and shall be displayed only on mainsail when used. The class logo is a stylized "F" as detailed in Appendix #1. Sail numbers are to be no less than 75mm tall and should be of a color which contrasts the sail color in such a way as to be easily visible. If desired owners may display their assigned sail number on the hull or deck of their boat as well without restriction. 

6.6.1 National Identifier
If desired, a three letter national identifier may precede the sail number. Three letter national identifiers are listed in the Racing Rules of Sailing as published by the International Sailing Federation. For the US the letters USA are used.

6.6.2 Local Identifiers
If desired, a local identifier such as yacht club identifiers may precede the sail number.

6.6.3 Placement 
Sail numbers shall be placed on both sides of the main sail. The starboard side sail numbers shall be placed higher than the port side sail numbers. They may also be placed on the jib if the skipper chooses to do so.


7.0 RADIO 
A maximum of two R/C channels shall be used to control the boat. One channel shall be used for sail control, the other for the rudder. Radios and receivers with more than two channels are allowed so long as only two channels are used. Radios must conform to national, state and/or local regulations.


8.0 ADVERTISING/SPONSORSHIP
Advertising and sponsorship may be displayed on boats and sails but so long as it does not interfere with the legibility of sail numbers and other identification per Rule 6.6.

Appendix #1

Appendix #2
 

 

Maximum Sail Measurements.

 

 

 

Mainsail

Jib

A

Luff

1125 mm

1030 mm

B

Leach

1160 mm

970 mm

C

Foot

375 mm

330 mm

D

Top Quarter Girth

139 mm

111 mm

E

Mid Girth

243 mm

200 mm

F

Bottom Girth

320 mm

279 mm

G

Foot Rounds

10 mm

10 mm

H

Head Board

13 mm

13 mm