Summary of Contents for NS J 105
- Page 1 TUNE YOUR RIG FOR OUTRIGHT SPEED J/105 Tuning Guide Solutions for today’s sailors J/105 Tuning Guide Solutions for today’s sailors...
- Page 2 The J/105 began what J-Boats describes as the “J/Sprit revolution”. It was the first boat of this kind introduced and has been followed by many models. The class has enjoyed great growth in recent years through the quality of the boat itself and the strong involvement of its’...
- Page 3 Fig. 1 Fig. 2 Part 1: Rigging Preparation have the backstay rod shortened to get enough backstay throw. The following recommendations are small changes that should be made to the stock Change to 4:1 or 6:1 Cunningham J/105 to allow you to get the most from The standard Cunningham is 2:1 and your North Sails and make the boat easier led aft to a cabinhouse halyard stopper.
- Page 4 Fig. 3 Fig. 4 Move mainsheet swivel base forward of jib lead block. In heavy air, it can be faster the traveler to use the turning block to sheet the jib This allows for easier trim of the gross outboard slightly. tune by the main trimmer, especially Part 2: Rig Set-Up and when tacking.
- Page 5 Center of pin at forestay fixing point of the mast Stem Line Furling Drum Sheer Line Stemhead Fitting Fig. 5 Fig. 6 Fig. 7 Step Three: Set Mast Rake shapes for those conditions. The result of proper rig tuning is the correct relationship Rake is controlled by headstay length.
- Page 6 marks on either side and adjust the Caps letter to win many events. However, until they are equal. understanding the fundamental concepts of how tuning affects the rig and sails is Step Five: Tensioning the Shrouds important to be able to check that the Tighten the D2s and D1s to hand tight.
- Page 7 hounds in under 9 knots and Zero in 9-12 much rudder angle to keep the boat going knots. In general the intermediates will straight. The optimum rudder angle to need to be eased twice as many turns as create the most lift is around 4 degrees. the lowers to achieve even sag.
- Page 8 Overall Power – The Backstay this relationship between how the The backstay is the most important sail backstay and rig tuning affects sail shape control for setting the overall power of when you may not be tuned correctly. If the sail plan. The backstay is the universal your rig is too loose, use more backstay to control to modify the shape of the main set the main up flatter, knowing that your...
- Page 9 been designed into the lower portion. In Jib Halyard over 12 knots begin to pull on the vang to The halyard is the most important sail induce low mast bend to flatten the lower control for shaping the jib and it has a third of the main.
- Page 10 trim in once you have accelerated to which increases camber. Conversely as the increase pointing. headstay gets tight, it pulls the luff away from the leech, decreasing camber. The Class mainsails are fitted with a spreader window so that you can see the Clearly this is very important, but has jib leech on the lower spreader.
- Page 11 Light Air sailing downwind is good communication In light air the crew should be well forward between the trimmer and the helmsman. and to leeward both upwind and down. The trimmer should constantly be telling the helmsman how much pressure he has Two crewmembers should be forward of in the sheet.
- Page 12 it will keep the main pressurized as well DOWNWIND NOTES as opening the slot between it and the Good coordination between the trimmer spinnaker to get the air flowing over it and helmsman will result in very faster. The main trimmer can easily feel subtle changes in the sheet.
- Page 13 J 105 Tuning Guide All Purpose Sail Adjustments (All full turns from BASE settings) V1 (Caps) D1 (Intermediates) D2 (Lowers) Light Winds (0-6 kts) -1.5 turn -3 turn -2 Turns Light/Medium Winds (6-10 kts) -1 turn -1.5 turn -1 Turns...
- Page 14 Worldwide Service All North Lofts offer: • Annual checkover At North Sails, we view each sail purchase • Winter storage as the beginning of a long and rewarding • Retrofitting relationship. We base this expectation on a • Educational strong service commitment that includes •...
- Page 15 The North Promise North Sails proudly stands by every product it makes. Our years of innovation, research and testing make us confident in the high quality of our products. This is why with every Cruising, Racing or One Design sail we offer free sail care and repair, honoured anywhere in the world through our network of...
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