J/105 Tuning Guide
Solutions for today’s sailors
TUNE YOUR RIG
FOR OUTRIGHT
SPEED
Page 1: ...J 105 Tuning Guide Solutions for today s sailors J 105 Tuning Guide Solutions for today s sailors TUNE YOUR RIG FOR OUTRIGHT SPEED...
Page 2: ...ly tight class racing At North we look at each sail with from a unique perspective and choose the best construction process that we are able to produce within the class rules We choose the best commer...
Page 3: ...so that you are not able to get enough tension in heavy air Some of the older boats actually need to have the backstay rod shortened to get enough backstay throw Change to 4 1 or 6 1 Cunningham The st...
Page 4: ...can be faster to use the turning block to sheet the jib outboard slightly Part 2 Rig Set Up and Preparation Tools and items required Loos RT 10M Rod Tension Gauge 2 crescent wrenches spray lubricant b...
Page 5: ...Rake Rake is controlled by headstay length The headstay should be set at the class legal maximum rake 13 035m 42 9 125 Hoist a crewmember up the mast and have them hold the butt of the tape measure at...
Page 6: ...portant to be able to check that the settings are right for your boat as well as customizing your own tuning numbers for your sailing style Keeping good records is the key Keep a Wet Notes pad on your...
Page 7: ...els too much the boat will get too much helm and the helmsman will have to use much rudder angle to keep the boat going straight The optimum rudder angle to create the most lift is around 4 degrees Th...
Page 8: ...nderstand this relationship between how the backstay and rig tuning affects sail shape when you may not be tuned correctly If your rig is too loose use more backstay to set the main up flatter knowing...
Page 9: ...ib lead placement and headstay tension Jib Halyard The halyard is the most important sail control for shaping the jib and it has a much greater affect on sail shape than the cunningham on the main How...
Page 10: ...ut it works much the same as mast bend affects mainsail shape As the headstay sags it pushes the luff towards the leech which increases camber Conversely as the headstay gets tight it pulls the luff a...
Page 11: ...uge difference The key to fast sailing downwind is good communication between the trimmer and the helmsman The trimmer should constantly be telling the helmsman how much pressure he has in the sheet T...
Page 12: ...eward when you head up in the lulls Heavy Air Sailing 12 knots TWS In over 12 knots the boat is well pressured up going downwind At this point you want to sail as low as possible most of the time Ther...
Page 13: ...8 kts Heavy Winds 18 kts TWS Light Winds 0 6 kts Medium Winds 10 14 kts Heavy Winds 18 kts V1 Caps 1 5 turn 1 turn BASE 35 RT10 Gauge 1 5 turn 3 turn V1 Caps 40 3 Turns BASE 55 RT10 Gauge 65 5 Turns D...
Page 14: ...and expert repairs North Sails is a network of more than 100 lofts in 34 countries around the world Each offers knowledgeable friendly personal sales and service Our size and worldwide reach also mea...
Page 15: ...l we offer free sail care and repair honoured anywhere in the world through our network of service locations Terms conditions apply For more information visit the North Sails Offshore One Design websi...
