INTENT: The Martin 242 was created as a strict one-design class. The intent is that all boats will be equal and that competition will be a true test of crews, not boats and equipment. Any effort to alter the boat or its rigging, except as specifically permitted by these rules, is prohibited.
DEFINITION: "Builder" means any manufacturer authorized by Martin Yachts Ltd. to produce the Martin 242, and accepted by the M242 Class Association.
MEASUREMENTS & SPECIFICATIONS:
1. KEEL & RUDDER: Repairing or fairing a keel or rudder shall preserve the basic shape supplied by the factory and as described below.
a. The rudder, weight corrector and shaft shall weigh at least 40#. Boats weighing more than minimum plus 50# shall have a combined rudder, weight corrector and shaft weighing at least 35#. The corrector weight shall be securely fastened to the rudder tube.
b. The rudder's maximum section shall measure between 2.700" and 2.945" at its thickest point. It shall be within 1" of the top of the rudder. The rudder's minimum section, excluding tip fairing, shall measure between 2.380" and 2.575" at it thickest point and shall be located within 2" of the bottom.
c. The rudder's maximum thickness shall be 23% of the local chord aft of the leading edge at the top and 30% aft at the bottom. Between the top and bottom sections, the point of maximum thickness in each section shall lie generally along a straight line between the top and bottom.
d. The rudder's top and bottom sections are defined in Appendix A. In addition to the definitions in paragraphs 1a, b & c, above, rudder sections shall be as defined in the tables for the top and bottom sections. Sections in between shall be an approximately fair transition from top to bottom (as would be created by drawing a straight edge along the rudder's side, touching the top and the bottom sections at the same percentage [of the local chord] aft of the leading edge).
e. The keel's maximum section shall measure between 3.290" and 3.350" at it thickest point and shall be located between 5" and 9" inches from the top of the keel. The keels maximum section 1" from the top shall be at least 3.215". The keel's minimum section shall measure between 2.040" and 2.200" at its thickest point and shall be located within 2" of the tip.
f. Any keel or rudder to be raced with Fleet 3 must comply with these tolerances.
2. SPARS & RIGGING: The spars and standing rigging as supplied by the builder may not be altered in any way except that the mast may be sleeved to repair damage so long as the original length is preserved, the bow light may be removed and the method of attaching the pole lift and downhaul to the spinnaker pole is optional.
a. Spinnaker pole shall be 8'3" long overall including fittings. Its tube shall be untapered aluminum.
b. Forward face of band on boom shall be 12'0" from aft face of mast measured horizontally.
c. Upper band on mast shall be 30'0" from the upper face of the lower band to the lower face of the upper band.
d. Lower band on mast shall have its upper face 6'3" from the mast butt. If the mast has been shortened (due to age or damage) the lost length may be made up by raising the mast step an equivalent amount.
e. Spinnaker ring shall be 1' from the upper face of the lower band. (It was 7'3" from butt, but see 2d.)
f. Nominal forestay length shall be 27'10.5". The length of the headstay may be longer or shorter than nominal but shall only be adjusted by adding or removing links. In addition the mast may not be raked more than 3.5° aft. Rake is the angle between the sheerline (a line between the bow and corner of the transom) and a line along the aft face of the mast (between the point where it exits the cabin top and where the headstay intersects the mast). The most rake we have measured is 3.42° .
g. The mast may be blocked at deck level.
h. Shroud tension may not be adjusted after the preparatory signal.
3. FITTINGS & LINES: Standard fittings and lines as supplied by the builder may not be altered or added to except as follows:
a. Builder supplied hardware may be replaced provided the mechanical advantage of the system is not increased and the location of the system and its cleat does not materially change.
b. The diameter, length and material of all running rigging are optional.
c. Provision for storing the spinnaker halyard, bag and pole may be added providing this hardware is used for no other purpose.
d. Lifelines and stanchions may be removed for class racing unless otherwise specified in the Notice of Race or Race Instructions.
e. An additional jib fairlead may be added within 20" of the winches.
f. An additional cleat may be added within 20" of the winches.
g. Jib luff tensioning devices are permitted, providing they are not lead aft of the furling drum.
h. A single line, cleat and turning block, per side, may be used for combination "barber haulers/twings", with location and means of attachment optional.
i. Spinnaker ratchet blocks may be located near aft stanchions.
j. A single turning block may be added to the boom to change the direction of the outhaul line. Type of cleat and location on boom is optional providing the purchase is not increased.
k. Foot braces may be added to cockpit seats on either side of the traveler.
l. A "barney post" and ratchet block may be added to the mainsheet/traveler system providing the purchase is not increased.
m. A main halyard stopper may be located forward of the starboard winch.
n. The bow mooring cleats may be replaced with 0.25" or larger "U" bolts.
4. HULL AND INTERIOR:
a. Additions to personalize the interior, which do not improve performance, are allowed as long as the structural integrity of the boat is not impaired.
b. Forward bunkboards and cushions may be removed. Settee cushions and boards must be carried in place.
c. The interior bulkheads may be reinforced with wood and fiberglass; however, any boat with any such reinforcement shall not race with the bunkboard just aft of the mast, in place. See explanation in the waivers section.
d. The bunkboard aft of the mast, if fitted, may be fixed (glued, bolted, etc.) in place.
e. Keel viewing windows are permitted in the vicinity of the keel.
f. The scuppers may be improved.
5. EQUIPMENT & INSTRUMENTS:
a. The following instruments may be used: mechanical masthead wind indicator, tell-tales, electronic or mechanical compasses, depth sounder, knot meter, log, LORAN, GPS, RDF, VHF, or other radio and such other safety equipment required by PHRF.
b. Electronic navigation aids, with the exception of those items specified in 5a above, are not permitted.
c. A working outboard motor with suitable bracket and sufficient fuel to conform to local PHRF requirements must be carried.
d. A battery must be carried at all times and the minimum size shall be a Group 24.
6. SAILS: Only three sails are allowed for use during a race – main, jib and spinnaker. Damaged sails may be replaced during a race.
a. All sails used in Class races shall be measured, and have their dimensions and date of manufacture written on them and be signed by their sailmaker. This shall be considered their certification.
b. All sails shall conform to, and be measured according to, PHRF (Southern California) definitions, limitations and measurement methods.
c. I.Y.R.U. Sail Measurement Instructions will be followed regarding reinforcements.
d. MAINSAIL:
i. Luff = 30'0" max.; Foot = 12'0" max.; Leech = 32.33' (32'4") max.; Mid-girth = 8.1' (8'1 3/16") max.; Upper girth = 4.69' (4'8 ¼") max.; Headboard = 4 0.5 " max.
ii. Main shall be made of Dacron with a minimum weight of 5.5 to 6.5 oz. (a 1 oz. variation to accommodate changing weights of new Dacron).
iii. Reefs shall be optional. One reef may be built into the main 4'6" above the foot on the luff and 4'8" above the foot on the leech. The addition of any cleats and leads for slab reefing is optional, providing this equipment is used for no other purpose.
iv. Four battens, the top three of which may be full length, shall be placed along the leech with equal spacing.
v. The mainsail may have a window in any location with a maximum area of 2.5 sq. ft. In addition it may also have a telltale window.
vi. A loose foot shelf is optional.
vii. The mainsail must have the Class Insignia on each side located between the top two battens. The Insignia shall be red with black numbers.
viii. The mainsail shall have numbers as required by the owner's National Authority.
e. JIB:
i. Luff = 26'4" max.; Foot LP = 8'11" max.; Foot round = 4" max. (measured perpendicular to a line from tack to clew).
ii. The jib shall have a minimum weight of 4.0 oz. Mylar is permitted as sailcloth.
iii. Battens are not permitted in the jib.
iv. The jib may have telltale windows.
f. SPINNAKER:
i. Luffs = 28'0" max.; Width = 15'0" max; Minimum girth (at widest part) = 14'6".
ii. The spinnaker shall have a minimum weight of .75 oz. S.M.Y.
iii. Spinnaker shape must be symmetrical.
iv. The spinnaker shall have numbers as required by the owner's National Authority.
7. WEIGHT: The boat shall not weigh less than 2500#.
a. When weighed the boat must contain: permanently mounted electronics, deck gear, fittings, mainsail and jib with their sheets, battery, spars, standing rigging, forward bunk boards if bolted in place and corrector weights.
b. Spinnakers, spinnaker sheets, spinnaker pole, motor, anchors, flares, safety gear, cushions, removable bunkboards and other miscellaneous gear shall not be aboard.
c. In the event that it is necessary to add weight to bring a boat up to minimum, 30% of the weight shall be securely fixed in place on the forward side of the main bulkhead and 70% securely fixed in place on the aft bulkhead near center.
d. If the forward bunkboards and cushions are carried in place a weight credit of 28# is assigned and shall count against the forward weight first. Lighter boards and cushions shall not qualify.
e. If lifelines are fitted, a weight credit of 6# is assigned. Lighter lifelines and stanchions shall not qualify.
f. If an outboard weighing more than 30# is carried the excess weight may be taken as a credit towards bringing the boat up to minimum weight.
g. If the rudder weighs more than 40#, an amount of weight equal to the excess may be moved from the rear bulkhead to the front bulkhead.
8. HIKING: Sustained hiking is not permitted and thighs shall be kept inside the boat.
9. PUMPING: The mainsail may be pumped using all parts of the mainsheet.
10. INSPECTION: In any Class event, the Race Chairman may require examination of any boat for adherence to the Class Rules as outlined above.
11. WAIVERS: When a change to the Class Rules results in a boat being put out of compliance, that boat may apply for a waiver from the Association. A list of wavered changes follows:
List of wavered boat changes as of 6/21/94 (not changed since 6/6/91):
Cookie Monster:
a) Motor mount completely changed. The molded in mount was removed, the transom was faired and a through hull mount well above the water line was added.
b) Boom end cut away
Mighty Mouse:
a) Man overboard tube installed through transom (non-functional, takes on water if left open)
12. Bulkhead & Bunkboard clarification (Rules 4c & 4d)
In June of 1991, it became apparent that there were 3 boats in the fleet with factory installed or recommended reinforced forward bulkheads. The fleet members were not willing to waiver them or to start a wave of boat stiffening. (The rationale for stiffening the bulkheads is the same as for fixing the bunkboard aft of the mast in place. It is hoped that a ring frame is created that will make the headstay tighter and make the boat perform better.) Thus, a compromise has been struck…Boats may have either the reinforced bulkheads or the bunkboard in place, but not both. The intent is to prevent a wave of boat stiffening.
Appendix A – Foil Sections
These tables are included to give repair crews something to work from in the event of need. The class's primary intent is to preserve the sections produced by the factory. The sections defined in these tables shall have a tolerance of 0.5% of the section's local chord. The tables give half thickness because they are easier to work with when making or checking templates for one side.
Keel Section
The keel's section is defined in the table below (within + 0.5% of the local chord). The tolerance means that the maximum section can be between 11% and 13% or that the 20% aft station thickness could be 4.04% to 5.04% instead of the table value of 4.54%.
Distance back
(% of local chord)
Half thickness
(% of local chord)
1.25
1.19
2.5
1.51
5
2.07
7.5
2.60
10
3.11
15
3.93
20
4.54
30
5.54
40
6.00
50
5.95
60
5.36
70
4.51
80
3.28
90
1.75
95
1.02
This table does not override the maximum or minimum keel thickness defined in paragraph 1e and keels should have maximum thickness at about 43% aft.
Rudder top Section
The rudder's top section is defined in the table below (within + 0.5% of the local chord).
Distance back
(% of local chord)
Half thickness
(% of local chord)
1.25
2.46
2.5
3.27
5
4.87
7.5
5.64
10
6.15
15
6.82
20
7.14
23
7.19
30
6.91
40
6.22
50
5.30
60
4.37
70
3.26
80
2.15
90
1.02
95
0.59
This table does not override the maximum or minimum rudder thickness defined in paragraph 1b and the rudder's top section should have maximum thickness at about 23% aft.
Rudder bottom Section
The rudder's bottom section is defined in the table below (within + 0.5% of the local chord).
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95 |
0.55 |
This table does not override the maximum or minimum rudder thickness defined in paragraph 1b and the rudder's bottom section should have maximum thickness at about 30% aft.
