1.0 General Concept
The following rules are not only intended to allow some
flexibility in construction but to also maintain the US 12 as a
One Design Class. All measurements are in inches and fractions.
Tolerances are plus or minus ¼ inch unless otherwise stated.
Early models of the US 12 that may be in minor variance with
these rules, including rudder configuration, shall be considered
to be conforming. This grandfather clause shall apply to hulls #
1- 100.
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2.0 Hull
2.1 The hull shall be made of hand-laid fiberglass cloth.
2.2 Hulls shall be obtained only from authorized manufacturers.
The class
secretary shall approve all manufacturers. The authorized
manufacturer
is Herb Harris/ Don Hawes, PO Box 214792, South Daytona, FL
32121,
phone ( 386 ) 767-7614.
2.3 The overall length of 46 inches is established by the class
mold.
The class mold is currently held and maintained by the
authorized
manufacturer.
2.4 Alteration to certified hulls by sawing, cutting, or adding
any material to
the exterior of the hull that would change the profile, contours
or shape in
any way is prohibited.
2.5 The sail control unit, rudder servo, receiver, antenna,
batteries and other
control equipment may be located in any position inside the
hull.
2.6 No modifications of any kind are allowable to the hull,
keel, or rudder.
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3.0 Deck
3.1 The deck shall only be constructed of wood, fiberglass,
plastic, or any
combination thereof.
3.2 Types of deck fittings are not restricted
3.3 The deck sheer shall be a fair and continuous curve.
3.4 The beam of the hull shall be 9 inches ( plus or minus 1/8
inch )
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4.0 Ballast and
Minimum Weight of the
Boat
4.1 Ballast shall consist of material that is not denser than
lead as per
AMYA bylaws.
4.2 Minimum weight of the complete fully rigged boat including
batteries
shall be sixteen pounds.
4.3 Lead shot or poured lead ballast may be used.
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5.0 Rudder
5.1 The shape, size and location of the rudder shall conform to
the design
specifications provided in the manufacturers building
instructions or as
approved as per the grandfather clause in Section 1.0 above
above.
5.2 Rudders shall be constructed of wood and/or fiberglass.
Aluminum or
brass inserts within the wood/ fiberglass are permitted.
5.3 The rudder shall not be thicker than the widest portion of
the aft section
of the keel.
5.4 The bottom of the rudder shall not extend below the keel.
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6.0 Spars
6.1 Booms may be constructed of wood or aluminum .
6.2 Permanently bent or curved booms are prohibited.
6.3 Jib booms shall not extend beyond the bow.
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7.0 Rigging
7.1 The spreaders shall not extend beyond the beam of the boat.
7.2 Any rigging styles or fittings are acceptable
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8.0 Mast
8.1 Maximum mast height ( inclusive of mast crane) shall not
exceed 61 in.
above the deck.
8.2 Masts may be constructed of wood or aluminum.
8.3 Rotating masts or “swing rigs” are prohibited.
8.4 Wind indicators that rotate freely and completely and are
clearly an
optional accessory to the mast and sails are optional and shall
not be
bound by the 61 in. maximum height specification.
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9.0 Sails
9.1 Sails may be of single panel or multi-paneled construction.
Sail materials
are unrestricted. Method of attachment to the mast and jib stay
is
unrestricted.
9.2 Corner reinforcements, broad seam reinforcements, batten
pockets and
battens are unrestricted as to material.
9.3 Halyard, downhaul and clew outhaul attachment points shall
be placed
within 1 inch of each sail corner.
9.4 Battens may be fitted to the mainsail and jib, with a
maximum of three
per sail. They shall be placed so as to divide the leech into 4
equal
segments. Their maximum length shall be 6 inches.
9.5 Sails may be measured on or off the spars.
9.6 Leech curves shall be defined by the measurement points and
faired
with a constant section batten connecting the corners of the
sail through
the intervening measuring points, with no bending induced in the
batten
beyond the corners of the sail.
9.7 Sail measurements for both A and B suits are shown in the
sail measurement
tables and the girth measurement diagrams included herein.
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10.0 Sail Numbers and Class Logo
10.1 The location and size of the sail numbers and class logo
shall conform
to the ISAF-RFD rules with the exception that:
10.2 The class insignia is a United States flag, which is 2.50
inches high by 3.75 inches
wide, above the number 12 which is .75 inches high
10.3 The sail number must be 4 inches minimum in height
10.4 The sail number shall be assigned by the class secretary
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11.0 Radio
11.1 Any FCC approved radio control system may be used as long
as it
operates on a recognized Surface frequency and employs no more
than
two channels for control operation
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12.0 Sheet Exits
12.1 Sheet exits are limited to 5/8 inches in height.
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Length Overall ( LOA ): 46 inches
Beam: 9 inches
Displacement: 16 pounds ( minimum )
Sail Area: 730 inches
Mast Height: 61 inches
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