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Sail technology and trim

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1 Sail technology and trim
Nick Turney North Sails

2 Nick Turney Sail Maker for 10 years Professional Sailor
TP 52 Farr 40 RP 65 Cookson 50 Professional Coach One Design

3 Sail Technology Rig Profile Using measurements from your boat

4 Sail Sizing We use the rig profile to design sails that best fit the rig

5 Spiral Edge Curves Horizontal and vertical curvatures Broadseaming

6 3D Layout Puts a yarn or panel layout on a design surface

7 Flow Pressure map for the sail plan

8 Membrain Applies 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

9 Membrain

10 Sail Trim Rig Tune Sail controls Big Lines Small Lines
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 Big Lines Sheets Small Lines Outhaul Cunningham Vang

11 Rig Tuning 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.

12 RAKE 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.

13 PreBend Static amount of bend in mast. Affected by: Shroud tension
Upper Lower Spreader angle Mast butt placement Placement at deck

14 Shroud Tension Increased Tension on uppers, gives
Increased compression on mast---more prebend Increased forestay tension, to a limit.

15 Rig Tuning

16 Sail Trim Basic Rule


18 Mainsail Trim 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

19 Traveler The traveler changes power in the mainsail by changing the angle to the wind The traveler will also affect pointing ability

20 Boom on center line Adjust to keep helm Neutral Up in light air Down in heavy air

21 Cunningham 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

22 Zero

23 + 25 mm

24 + 50 mm

25 + 100 mm

26 Outhaul Loose outhaul makes the lower main fuller for more power
Tighter outhaul flattens lower main and opens leech

27 Tight outhaul

28 20 mm looser

29 40 mm looser

30 60 mm looser

31 80 mm looser

32 Main Sail Trim Moderate Light Air Outhaul Max Outhaul Loose
Cunningham loose Vang Snug, no slack Backstay, adjust power to keep boat flat Traveler, keep boat flat Mainsheet top parallel or slightly open Light Air Outhaul Loose Cunningham off Vang Loose Backstay, loose Traveler up to boom on C/L. Mainsheet- Top Batten parallel

33 Main Sail Trim Heavy Air Outhaul Max Cunningham, no wrinkles
Vang very firm Backstay on hard Traveler, down, below C/L Mainsheet, top batten open degrees

34 Head Sail Trim Jib Lead Jib Halyard 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

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 chop Lead Forward Eased Sheet Medium Air Tighter Halyard in flat water, looser in chop Lead Middle Tighter Sheet

37 Head Sail Trim Heavy Air Really Tight Halyard all the time Lead Aft
Sheet eased

38 Spinnaker Trim 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

39 Spinnaker Trim 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

40 Spinnaker Checklist Pole Height, Inboard and Outboard
Sheet Tension Discussion Pole angle Keep sheet moving

41 Downwind Trim 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




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