Proposed Rule Change
The entire section for the AMYA approved J Class Rules has been re-written and is presented below in it's entireity as it appears in the current issue of the AMYA Quarterly magazine issue # 160. It is on the upcoming ballot and will be voted upon in the upcoming ballot issue #161 which should arrive to AMYA members in August, 2010. The vote will be a Yes/No vote, and if passed will preclude any further changes to the J Class rules for a period of 2 years as per the bylaws.
ALSO at the end of the rules section you will find the PROPOSED MOTION for the limitation of the Main sail roach. Both items will be voted on the in the upcoming ballot issue of the AMYA Quarterly magazine.
AMYA Class Specifications for the J Class Model Yacht
1.0 General
1.1. The J Class Model Yacht is a restricted design model yacht class. The purpose of these rules is to create a class that represents the spirit and beauty of the original J Class Yachts as they sailed in the 1930's. In that vein the hull and deck must be as close to the original as possible in shape unless otherwise specified in the rules. 1.2
1.2. The boat, not the skipper is entered into events. Changing skippers during an event shall be permitted.
1.3. As necessary, interpretations of the Class Specification may be requested from the Class Secretary. When issued, interpretations shall be communicated to all class members through the AMYA Quarterly magazine and the J Class website.
1.3.1. Interpretations are to be temporary to allow class members to challenge them and call for a class vote using the annual AMYA ballot to accept or reject a specific interpretation.
1.3.2. Interpretations not challenged within one year of issue shall become permanent and incorporated in any subsequent revision of these specifications.
1.4. Line Drawings
1.4.1. Line Drawings in 1/16th scale by Serraro, Tagland, Chevalier, Marine Maritime Museum and M.I.T. are accepty by the class as being within the level of accuracy required.
1.4.2. Line drawings not listed above shall be submitted to the Class Secretary for approval.
2. HULL
2.1 Hulls shall be a scale model of the yachts listed in the chart in section 10.
2.2. Scale shall be 3/4" equals one foot, also known as 1/16th. The exception being the 5/8" scale Whirlwind, which was produced by Vanguard and Whirlwind Model Yachts.
2.3. Exception: The keel draft may be two inches deeper than scale. This addition shall be fair with the lines of the original hull. (wings, bulbs, widening of the keel etc. shall not be permitted.)
2.4. Centerboards scaled to original dimensions shall be permitted.
2.5. Hull material not restricted
2.6. Minimum bare hull weight shall be 9 pounds. Hulls built and registered with the Class Secretary before 1/1/2011 shall be exempt from this requirement.
3. Deck
3.1. The deck shall be only constructed from a hard material such as wood, fiberglass (which may have a wood core), and /or Formica.
3.2. Fabric & film decks are not permitted.
3.3. The deck sheer line shall be a fair and continuous curve.
3.4. Original topical deck structures, furniture and fittings may be omitted.
4. RUDDER
4.1. Rudder shall conform to the original boat from which it was scaled.
4.2. Exception: The rudder may be two inches deeper to follow an extended keel and two inches wider to provide extra maneuvering control.
4.3. There are no material restrictions on the rudder.
5. RIG
5.1. A spar shall be all aluminum, all wood, or a composite of wood with an interior reinforcing core of any mateiral. The exterior of a composite reinforced mast shall be uniformly wood.
5.2. Mast height may be to scale of the yachts original sail plan, not to exceed 10 feet.
5.3. Booms
5.3.1. Booms shall be either a scaled version of the boom used on the full size boat or linear without a permanent bend or curve.
5.3.2. Jib booms, including counter weights, shall not extend beyond the bow. In the case of a boat whose original desugn includes a bowsprit, the jib boom shall not extend beyond past the bowsprit.
5.4. There are no material restrictions on rigging as defined by the Equipment Rules of Sailing.
5.5. Rotating masts or "swing rigs" are prohibited.
6. SAILS
6.1. Sail area limits are defined in the chart in section 10.
6.2. Any sail plan used by the original boat from which the model was scaled, i.e. : double head sails, genoa, spinnakers, etc may be used.
6.3. Spinnakers shall be unmeasured sail area.
6.4 Self-tacking jibs may be used in place of the original foresail plan.
7. WATERLINE
7.1. Required load waterline length is defined in the chart in section 10.
7.2. Once measured for an event, no alterations shall be made that alter the waterline length, draft or displacement , except as noted in section 7.4
7.3 For events where the waterline length, draft and/or displacement are not measured, alterations shall not be made after the first race except as noted in Section 7.4
7.4. Notwithstanding Section 7.2 & and 7.3 jib boom counterweights may be adjusted or changed at any time.
8. RADIO FUNCTIONS
8.1. There are no restrictions on the scope or the amount of radio functions.
9. OPTIONAL ITEMS
9.1. Radial jib fittings may be utilized.
10. YACHTS
LWL inches measure at ready to sail weight.
| Original: | Sail Area: | LWL Min: | LWL Max: |
| Shamrock | 4241 | 60.81 | 62.81 |
| Weetamoe | 4247 | 62.25 | 64.25 |
| Yankee 1934 | 4100 | 62.25 | 64.25 |
| Whirlwind | 4128 | 64.50 | 66.50 |
| Whirlwind 5/8" | 3440 | 53.75 | 55.75 |
| Enterprise | 4265 | 60.00 | 62.00 |
| Velsheda | 4242 | 62.25 | 64.25 |
| Endeavor | 4253 | 63.00 | 65.00 |
| Rainbow | 4238 | 61.50 | 63.50 |
| Endeavor II | 4243 | 64.88 | 66.88 |
| Yankee 1937 | 4248 | 65.25 | 67.25 |
| Ranger | 4245 | 65.25 | 67.25 |
For the purpose of this rule, S&S A-F shall follow Ranger's measurements
Converted: |
Sail Area: | LWL Min: | LWL Max: |
| Britannia | 4248 | 65.16 | 67.16 |
| Astra | 4218 | 57.16 | 59.16 |
| Cambria | 4288 | 56.25 | 58.25 |
| Candida | 4234 | 59.58 | 61.58 |
| Resolute | 4248 | 62.00 | 64.00 |
| Katoura | 3930 | 56.25 | 58.25 |
| White Heather II | 4992 | 56.50 | 58.50 |
| Vanitie | 5313 | 56.25 | 58.25 |
Unbuilt:
| John Alden Project | 4248 | 60.75 | 62.75 |
| Wasa/Svea | 4262 | 65.33 | 67.33 |
| Frank Payne Project | 4248 | 66.16 | 68.16 |
End of the proposed J Class Rule.
J-M2 Motion for the J Class
Motion by David Brawner, #7413, Class Advisory Committee Chairman, J118
Seconded by John Hanks, 2335, J Class Secretary, J24
This was suggested by class members with the desire to keep the scale like appearance of the class without placing undue burden to replace current sails to meet the requirements of the motion. This motion was designed to be placed within the current rule section 3, or in the proposed rule motion section 6:
Main sail roach shall not exceed 3".
Foresail roach shall not exceed 2"
The head of each sail shall not exceed 1.5" .
The roach shall be fair and continuous curve from head to the clew.
Sails built before 1/1/2011 shall remain legal.