RIG TUNESAIL CONTROLS Vertical shrouds (Uppers/ Cap) Rake, headstay sag, prebend Diagonal shrouds (lowers) Side to side bend Flatness of main sail Back Stay Headstay sag, mainsail shape Runners/ Checkstays Headstay sag, mainsail shape Big Lines Sheets Small Lines Outhaul Cunningham Vang
1. With your boat on land and your mast up, plumb bob the keel to make sure it is straight up and down 2. Set mast parallel to keel 3. Note that sheerline and chainplates are often inconsistent.
The fore and aft relation of center of effort to center of resistance creates helm, weather or lee More rake increases weather helm, less rake decreases it.
Static amount of bend in mast. Affected by: Shroud tension Upper Lower Spreader angle Mast butt placement Placement at deck
Increased Tension on uppers, gives Increased compression on mast---more prebend Increased forestay tension, to a limit.
Oversheeting the mainsheet will close the leech, increasing weather helm and making the bow want to point up Easing the mainsheet opens the leech and decrease weather helm, making the boat easier to sail straight
The traveler changes power in the mainsail by changing the angle to the wind The traveler will also affect pointing ability
Boom on center line Adjust to keep helm Neutral Up in light air Down in heavy air
Draft forward is a better heavy air shape, keeping the leech more open to depower Draft aft is a better light air shape, firming the leech for power
Light Air – Outhaul Loose – Cunningham off – Vang Loose – Backstay, loose – Traveler up to boom on C/L. – Mainsheet- Top Batten parallel Moderate – Outhaul Max – Cunningham loose – Vang Snug, no slack – Backstay, adjust power to keep boat flat – Traveler, keep boat flat – Mainsheet top parallel or slightly open
Heavy Air – Outhaul Max – Cunningham, no wrinkles – Vang very firm – Backstay on hard – Traveler, down, below C/L – Mainsheet, top batten open 5- 10 degrees
Jib Lead – Controls Twist – Forward=more power, less twist – Back= less power, more twist Jib Halyard – Entry Position – Full Entry is better for chop – Fine Entry is better for flat water
Jib Sheet – Controls Over all shape and depth – Inboard and Outboard position
Light Air – Medium halyard- finer entry, looser in chop – Lead Forward – Eased Sheet Medium Air – Tighter Halyard in flat water, looser in chop – Lead Middle – Tighter Sheet
Heavy Air – Really Tight Halyard all the time – Lead Aft – Sheet eased
A full shape is more stable and good for power in chop or when pumping A flatter shape provides more exposed area and is most effective in flat water
Pole too high flattens the luff and moves the draft aft, closing the leech 2. Lowering the pole moves the draft forward and opens the leech
Pole Height, Inboard and Outboard Sheet Tension Discussion Pole angle Keep sheet moving
Too little vang allows too much twist and flattens the top of the main, depowering the sail Vang on decreases twist and makes the top of the main deeper and more powerful