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Sail technology and trim

Sail technology and trim. Nick Turney North Sails. Nick Turney. Sail Maker for 10 years Professional Sailor TP 52 Farr 40 RP 65 Cookson 50 Professional Coach Farr 40 TP 52 One Design . Sail Technology. Rig Profile. Using measurements from your boat. Sail Sizing.

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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 • Farr 40 • TP 52 • 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 • 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

  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

  17. 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

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

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

  20. 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

  21. Zero

  22. + 25 mm

  23. + 50 mm

  24. + 100 mm

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

  26. Tight outhaul

  27. 20 mm looser

  28. 40 mm looser

  29. 60 mm looser

  30. 80 mm looser

  31. Main Sail Trim • 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 • Light Air • Outhaul Loose • Cunningham off • Vang Loose • Backstay, loose • Traveler up to boom on C/L. • Mainsheet- Top Batten • parallel

  32. 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 5- 10 degrees

  33. Head Sail Trim • 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

  34. Controls • Jib Sheet • Controls Over all shape and depth • Inboard and Outboard position

  35. Head Sail Trim • 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

  36. Head Sail Trim • Heavy Air • Really Tight Halyard all the time • Lead Aft • Sheet eased

  37. 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

  38. 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

  39. Spinnaker Checklist • Pole Height, Inboard and Outboard • Sheet Tension Discussion • Pole angle • Keep sheet moving

  40. 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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