8 MembrainApplies pressure from Flow to rig and sails. Coupled with specified material properties and sail control settings, sails and rig are deformed to match sailing conditions for the specified wind speed
10 Sail Trim Rig Tune Sail controls Big Lines Small Lines Vertical shrouds (Uppers/ Cap)Rake, headstay sag, prebendDiagonal shrouds (lowers)Side to side bendFlatness of main sailBack StayHeadstay sag, mainsail shapeRunners/ CheckstaysBig LinesSheetsSmall LinesOuthaulCunninghamVang
11 Rig Tuning1. With your boat on land and your mast up, plumb bob the keel to make sure it is straight up and down2. Set mast parallel to keel3. Note that sheerline and chainplates are often inconsistent.
12 RAKEThe fore and aft relation of center of effort to center of resistance creates helm, weather or leeMore rake increases weather helm, less rake decreases it.
13 PreBend Static amount of bend in mast. Affected by: Shroud tension UpperLowerSpreader angleMast butt placementPlacement at deck
14 Shroud Tension Increased Tension on uppers, gives Increased compression on mast---more prebendIncreased forestay tension, to a limit.
18 Mainsail TrimOversheeting the mainsheet will close the leech, increasing weather helm and making the bow want to point upEasing the mainsheet opens the leech and decrease weather helm, making the boat easier to sail straight
19 TravelerThe traveler changes power in the mainsail by changing the angle to the windThe traveler will also affect pointing ability
20 Boom on center lineAdjust to keep helm NeutralUp in light airDown in heavy air
21 CunninghamDraft forward is a better heavy air shape, keeping the leech more open to depowerDraft aft is a better light air shape, firming the leech for power
32 Main Sail Trim Moderate Light Air Outhaul Max Outhaul Loose Cunningham looseVang Snug, no slackBackstay, adjust power to keep boat flatTraveler, keep boat flatMainsheet top parallel or slightly openLight AirOuthaul LooseCunningham offVang LooseBackstay, looseTraveler up to boom on C/L.Mainsheet- Top Battenparallel
33 Main Sail Trim Heavy Air Outhaul Max Cunningham, no wrinkles Vang very firmBackstay on hardTraveler, down, below C/LMainsheet, top batten open degrees
34 Head Sail Trim Jib Lead Jib Halyard Controls Twist Forward=more power, less twistBack= less power, more twistJib HalyardEntry PositionFull Entry is better for chopFine Entry is better for flat water
35 Controls Jib Sheet Controls Over all shape and depth Inboard and Outboard position
36 Head Sail Trim Light Air Medium Air Medium halyard- finer entry, looser in chopLead ForwardEased SheetMedium AirTighter Halyard in flat water, looser in chopLead MiddleTighter Sheet
37 Head Sail Trim Heavy Air Really Tight Halyard all the time Lead Aft Sheet eased
38 Spinnaker TrimA full shape is more stable and good for power in chop or when pumpingA flatter shape provides more exposed area and is most effective in flat water
39 Spinnaker TrimPole too high flattens the luff and moves the draft aft, closing the leech2. Lowering the pole moves the draft forward and opens the leech
40 Spinnaker Checklist Pole Height, Inboard and Outboard Sheet Tension DiscussionPole angleKeep sheet moving
41 Downwind TrimToo little vang allows too much twist and flattens the top of the main, depowering the sailVang on decreases twist and makes the top of the main deeper and more powerful