One Design:
Ullman Martin 242
Rig & Sail Tuning Guides

242 Boat Preparation

The preparation required to get a stock 242 racing is minimal, but as with any tough class this work is essential if you want to make any changes, be sure to check the class rules. One important (and legal) modification is to drill extra holes in the stock jib tracks to allow more precise positioning of the jib lead. The modified tracks should have holes 5/8" from center to center. Another important change is to substitute a 3/8" Kevlar composite or spectra for standard pre-stretch dacron main halyard. We also suggest you get spectra tapered spinnaker sheets- they should be 60 feet of 3/16" spectra with 40 feet of 3/8" polyester casing. These tapered sheets are easy to handle, do not stretch, and lift easily n light airs.Additionally, a good compass is essential such as a KVH or TacTic mounted on the mast.

Rig Tuning

Tuning the 7/8ths rig on the 242 is a relatively simple exercise. First, make sure that your factory-supplied forestay is the maximum-allowed length of 27’1 ¼". Next, the mast should be blocked forward in the mast collar (partners) as far as possible, which will straighten the mast in the area of the mainsail luff and keep the forestay tighter. The upper shrouds should be very tight-approximately 600 pounds of tension if you use a tension gauge. When beating in 12 to 14 knots of (true) wind, the uppers on the leeward side should be firm. At the same time, the lowers should be tightened so that the mast is as straight as possible athwartships. The loose tension gauge would read 46 upper 35 lower. The spreader angle is not adjustable.

Mainsail Trim

The mainsheet has two functions: It controls the leach of the main, and it provides headstay tension for the jib. Don’t use the backstay to bend the mast or tension the headstay this will over-flatten the main, and leach tension will be lost. The leach should be kept straight with a tight mainsheet. From about 7 to 14 knots upwind the telltale on the top batten on the main should be stalled about two-thirds of the time. Below seven knots the sheet should be eased enough to keep the telltale just flying all the time. In winds above 14 knots the upper part of the tapered mast will automatically bend to open the main leach and flatten the main, so once again the backstay isn’t necessary. In very windy and rough conditions it may be faster to ease the mainsheet four to six inches to open up the main leach even more.

Next to the mainsheet, the traveler is the most important sail control. Mainsheet tension allows the 242 to point; dropping the traveler helps her foot. In getting the boat up to speed, start with the mainsheet in tight and the traveler to the point listed in Table I for the current wind speed. If your speed drops excessively, lower the traveler a little; think of the traveler as your gas pedal.The main outhaul should be kept within 1" to 2" of maximum when sailing upwind in any breeze over about eight knots, and in lighter winds it should be eased slightly more. When reaching and running most class experts ease the outhaul another 2" from the outhaul setting for that wind speed. The cunningham should be kept loose in all wind speed under 15 knots – don’t use it as a wrinkle remover – those wrinkles are fast! Once the wind reaches 15 knots, the cunningham can be pulled on quite tightly to keep the draft forward in the sail.The boomvang on the 242 is very powerful (12:1) and is not normally used upwind. When reaching and running, be careful not to over tension the main leach with the vang – let the leach breathe and keep the telltales from stalling.

Wind Speed	Traveler Position
0 - 5 knots	Center - 4 inches down
5 - 10 knots	Center - 4 inches up
10 - 15 knots	Center - 4 inches down
15 - 20 knots	8 - 12 inches down
20 - 25 knots	12 - 18 inches down

242 Jib Trim

The first step in setting up the jib is to tighten the halyard adjuster inside the zipper luff of the sail until the slack is taken out of the jib luff. Next, position the jib lead so that when the jib is pulled in tight, the leech and the foot have roughly equal tension – neither should be too tight. Then set the jib halyard tension so that the jib clew will just touch the lead block when the sheet is pulled in very tightly. This jib halyard tension is a good starting point for most wind conditions. Calibrate the halyard adjustment by marking the sail is fully hoisted. When using the setting described above, the jib luff will appear quite loose – don’t be alarmed, as this keeps the jib luff entry fine, and allows you to point high. Follow the guide in Table II for jib sheet tension.As the wind speed rises above 14 knots, the jib leads should gradually be moved aft about 4". This allows the jib to twist off and open up the slot. If the main flogs in strong winds it means the jib is trimmed to tight – move the leads aft or ease the sheet. A flogging main does not always mean that the jib is not balanced. The most common sail trimming error in strong winds is over – trimming.

Wind Speed	Jib Block to Jib Clew
0 - 5 knots	4 - 6 inches
5 - 7 knots	3 - 4 inches
7 - 15 knots	1 - 2 inches
15 - 20 knots	4 - 6 inches
20+ knots	6 inches +

242 Spinnaker Trim

The 242 spinnaker is quite tall, and as a result the sail is very sensitive to pole position. Generally speaking, the spinnaker clews should be level, or the pole clew (tack) should be up to 6" lower than level. Keep a close eye on the pole height, particularly in shifty conditions when constant adjustment will be required. The fore – and aft position of the pole is also a sensitive adjustment can make a huge difference. Mark the spinnaker sheets near the winches when the clews are near the forestay to help you in reach-to-reach jibes and spinnaker sets.

242 Weight Placement

Most of the top boats in the class sail with four, but the boat can be sailed by three easily.As far as weight positioning goes, athwartships heel should be small (less the 12 degrees) in all but the very lightest conditions. When beating and running in fewer than five knots, it will pay to use some heel to reduce the wetted surface and keep the sails still. Fore-and-aft weight positioning is also important. In most wind speeds the crew weight should be centered about 30" aft of the cabin back, both up and downwind. When running and reaching in heavy air, move the weight back another 12" to 18".The most common trim errors are having too much weight aft when running in heavy air, and not enough weigh aft when reaching in moderate air. On a spinnaker reach in 12 to 14 knots of wind, the bow must be kept from digging in by shifting the crew weight aft. The spinnaker trimmer should be on the weather rail just forward of the cabin back, not at the mast. In light air when running, the crew weight should be centered fore-and-aft in or near the front of the companionway opening.

The Martin 242 is a straightforward boat to sail. Its simplicity allows less experienced sailors to get up to speed quickly, and to race evenly with the experts. Racing in this class is very close, and we hope this guide will assist newcomers in their quest for the top.

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Martin 242 Tuning Guide