Contents
- Objectives
- Administration
- Design Owner
and Licensed Builders
- Class Membership
and Voting
- Measurement
and Owner's Certificate
- Construction
- Optional Equipment
- Class Sanctioned
Events
- Changes to Rules
1. Objectives
The purpose of these rules is to maintain the one design integrity
of the JB 5/50. The JB 5/50 Owner's Association shall administer
these rules.
2. Administration
The JB 5/50 Owner's Association shall be responsible for all
class events and administration of these rules, the election
of office bearers and liaison with licensed builders and the
maintenance of a class register of owners.
3. Design Owner and Licensed Builders
The owner of the design is the J B Boat
Co Australia who will appoint builders licensed to produce &
market the J B 5/50
within such areas as the owner
deems necessary.
4. Class
Membership & Voting
The Owner(s) of each yacht will pay an annual subscription to
the Class Association for the right to:
(i) Compete in Class Events
(ii) Vote in matters relating to the Association
In the case of a yacht being owned by more than one person the
yacht will only have one vote.
Yacht owners will be identified from a valid measurement certificate.
The design owner shall have one vote in any ballot.
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5. Measurement and Owner's Certificate
All yachts will be issued with Certificate of Measurement and
Ownership signed by an officer of the association. On change
of ownership the Measurement Certificate must be re-validated
by an Association Official.
6. Construction
(i) Hull and Deck
All boats shall be produced from moulds manufactured by the
design owner and will be produced to the specification laid down
by the design owner. Hulls with all deck fittings correctly
attached and including the spinnaker pole and centre board
will weigh 115Kg. +/- 3Kg.
(ii) Mast Assembly, Boom and Spinnaker Boom
These components may be built by others authorised by the
licensed builder and may only be supplied by a licensed
builder.
(iii) Foils and Rudder Stock
These components shall be supplied only by licensed builders.
(iv) Sails
Sails and sail battens shall only be supplied by licensed builders.
Any sail repair must not affect the original sail shape. The
location of tell tales and leech ribbons are optional. Sail
numbers shall be 305mm in height and displayed in accordance
with ISAF regulations.
(v) Fittings and Hardware
The mainsheet cam swivel base can be located fore or aft of
the mainsheet traveller. The spinnaker halyard turning block
location is optional. The location of other fittings
shall not be altered from their original position.
(vi) Forestay
The forestay is of fixed overall length, being 5673mm pin to
pin excluding the furler but including the top swivel, halyard
block and fork attachment.
(vii) Running and Standing Rigging Specifications
Item |
Material |
Purchase |
Min Diam (mm) |
|
| Jib Sheets |
Rope |
1:1 |
8 |
| Main Sheet |
Rope |
4:1 |
8 |
| Main Sheet Trav. Control |
Rope |
2:1 |
5 |
| Spin Sheets |
Rope |
1:1 |
8 |
| Vang |
Rope |
24:1 |
5 |
| Outhaul Tail |
Rope |
8:1 |
4 |
| Main Halyard |
Rope |
1:1 |
4 |
| Jib Halyard |
Rope |
2:1 |
4 |
| Spin. Halyard |
Rope |
1:1 |
5 |
| Jib Furler Control |
Rope |
|
3 |
| Bowsprit Control - Out |
Rope |
|
5 |
| Spin. Tack Line |
Rope |
|
5 |
| Centre Board Up/Down |
Rope |
|
5 |
| Shrouds |
SS-1/19 |
|
3.2 |
| Forestay |
SS-1/19 |
|
3.2 |
| Outhaul |
Rope |
|
4 |
7. Optional Equipment
Compass of any type
Tell tales on any sails
Mast head wind indicator
Footstraps of any length or material
8. Class Sanctioned Events
All class events shall be conducted within the following boundaries:
Weather Conditions
Races shall not be started in winds in excess of 20 knots and
shall not be continued if average wind speeds (not gusts) exceed
20 knots.
Crew
Total crew weight shall not exceed 185kg. A three person crew
is permitted but they must compete in all events. There will
be no substitution of helmsperson. No part of the body below
the middle thigh will protrude beyond the gunwhale when hiking
out. When lying along the deck no more than 1/2 of the body
and head shall protrude beyond the gunwale.
Sails
A yacht shall carry only one jib, mainsail and spinnaker
in each race. Sail purchases are limited to one of each type
within any 12 month period.
Shroud Adjustments
While racing the shroud tensions shall not be altered.
9. Changes to Rules
Any proposed changes to these rules shall be voted upon by financial
members of the Owner's Association and the ballot will be conducted
by post. Sufficient time will be allowed for ballot papers to
be returned.
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