1. Islander 36 Fleet San Francisco Bay
Sail Shaping for Performance Sailors Sail Trim Lecture
Module #2

2. Sail Shaping for Performance Sailors Second Module
Mainsail Shaping
Rig Control
Shifting Gears for Conditions

3. Mainsail Shaping Mainsail Anatomy Mainsail Shaping Tools
Halyard
Cunningham
Outhaul
Boom Vang
Mainsheet
Backstay Adjuster
Reefing Lines
Mainsail Shaping

4. Mainsail Anatomy

5. Mainsail Parts

7. Fore & Aft Location of Draft in Mainsails

8. Twist in the Main

9. Vintage Star Main with Twist

10. J24 Worlds – Main Trim

11. Islander 36 Main Trim - Telltales

12. Farr 40 Worlds SF - Mainsail Trim

13. I36 San Francisco - Mainsail Trim

14. Farr 40 Worlds SF - Mainsail Trim

15. Islander 36 Mainsail Trim - Twist

16. IAC Mainsail Design – Our Future

17. Sail Shaping for Performance Sailors Second Session
Mainsail Shaping
Rig Control
Shifting Gears for Conditions

18. Rig Controls Masthead Rig Backstay Adjuster Boom Vang/Preventer
Roller Furlers

19. Islander 36 Rig

20. Islander 36 Rig

21. Swan World Cup – Masthead Rigs

22. Islander 36 San Juan Islands Rig Control & Headstay Sag

23. IAC Mast Bend/Main Trim

24. Angostura Regatta – Rig Loss

25. The Roller Furler Controversy Angostura – Odessy Roller Furler

26. Islander 36 with Roller Furler

27. UK Sails Roller Reefing Dacron Genoa

28. UK Sails Roller Reefing Mylar Genoa

29. Sail Shaping for Performance Sailors Second Module
Mainsail Shaping
Rig Control
Shifting Gears for Conditions

30. Shifting Gears for Conditions
Lead Positions
Halyard Trim – Draft Forward
Sheet Trim
Boom Vang
Traveler to Leeward
Mast Bend
Feathering versus Pinching
Reefing

31. Shifting Gears for Conditions
First Gear is Used in 0 – 6kts of Breeze
Light Wrinkles in Jib Luff
Draft 45 to 50% Aft for Regular or Point Mode
Jib Leads – 2 Holes Forward
Medium Wrinkles in Main Luff
Maximum Main Draft 55%
No Backstay/Mast Bend
Traveler to Windward and Ease Mainsheet to Induce Maximum Leech Curve – Vertically
Boom Vang - Loose
Induce Heel – Crew Weight to Leeward

32. Islander 36 - First Gear

33. Islander 36 Fleet - First Gear

34. Shifting Gears for Conditions
2nd Gear is Used in 6 – 12kts of Breeze
Light Wrinkles in Jib Luff
Draft 45 to 50% Aft for Regular or Point Mode
Jib Leads – Regular Position for all Telltales to Break at Once
Medium Wrinkles in Main Luff
Maximum Main Draft 55%
Light Backstay/ Little Mast Bend
Traveler Slightly to Windward and Trim Mainsheet to Reduce Vertical Leech Curve – Increase Pointing
Boom Vang Tension – Light to Firm to Restrict Boom Lift
Heel – Crew Weight to Windward

35. Islander 36 2nd Gear

36. Islander 36 2nd Gear

37. Shifting Gears for Conditions
3rd Gear is Used in 13 – 18kts of Breeze
No Wrinkles in Jib Luff
Draft 45% Aft for Regular or 40% for Power Mode
Jib Leads – 2 Holes Aft Position for Upper Telltales to Break First – Light Upper Leech Twist
Less Wrinkles in Main Luff
Cunningham and Outhaul on Hard
Maximum Main Draft 50%
Medium Backstay/ Moderate Mast Bend
Traveler Mid-ships and Trim Mainsheet to Reduce Twist
Boom Vang – Taught to Very Tight
Heel – All Crew Weight to Windward

38. Islander 36 Racing - Third Gear

39. Islander 36 Cruising - Third Gear

40. Islander 36 – Upwind Main Twist

41. Shifting Gears for Conditions
4th Gear is Used in 19 – 25kts
Smaller Headsail – Jib
Halyard – Draft Forward (40%)
Jib Leads – 3 to 4 Holes Aft = Medium Leech Twist
Bladed Out Main – Draft Forward (45%)
Maximum Backstay
Traveler to Leeward
Maximum Boom Vang – Vang Sheet if Gusty

42. Islander 36 4th Gear Trim

43. Islander 36 4th Gear Trim

44. Shifting Gears for Conditions
5th Gear is Used in 25kts and Up
Reef
Balance
Heel
Draft Forward in Jib for Breakthrough Power
Jib Leads Aft for Upper Leech Twist (4 to 6 Holes) = De-power
Flat Main w/Big Speed Bubble & Leeward Traveler
Use Vang Sheeting

45. Islander 36 Cruising - 5th Gear Trim

46. BOC Single Handed Heavy Air Trim

47. 5 Key Factors for Success
Trim/Sheet Both Sails in Unison
Sync up Jib and Main Draft Positions 40/45, 45/50 and 50/55
Use Draft Stripes to Help Set Draft Positions
Main Trim Upwind– Top Telltale Flying 50%, All Others Flying 100%
Feather to Manage Extra Power and Heel

48. Sail Shaping for Performance Sailors Second Module – Q&A
Mainsail Shaping
Rig Types
Rig Control
Shifting Gears for Conditions