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Wind and Tide

Peter Bentley Technical Projects Manager Skandia Team GBR. Wind and Tide. You don't need a weather man To know which way the wind blows Bob Dylan Subterranean Homesick Blues. Wind and Tide. Wind and Tide. Wind and Tide. Wind and Tide. Sailing in tide - Which way does the wind blow?

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Wind and Tide

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  1. Peter Bentley Technical Projects Manager Skandia Team GBR Wind and Tide

  2. You don't need a weather man To know which way the wind blows Bob Dylan Subterranean Homesick Blues Wind and Tide

  3. Wind and Tide

  4. Wind and Tide

  5. Wind and Tide

  6. Sailing in tide - • Which way does the wind blow? • Solutions: • Trigonometry • Vectors Wind and Tide

  7. Solutions: • Trigonometry • Vectors Wind and Tide

  8. Vectors • Vectors are easy! • The length of the line represents the magnitude of the action – speed of wind, tide, boat etc. • The angle of the line represents the direction the wind, boat, tide etc. is moving. • If we draw the lines so they touch at the ends, we can ‘add’ the vectors Wind and Tide

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  22. Downwind: • Which way does the wind blow? • Where shall we put the mark? Wind and Tide

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  30. Windward-Leeward Courses • Using just two buoys you can’s set a perfect beat and a perfect run in a cross-tide situation Wind and Tide

  31. Windward-Leeward Courses • Using just two buoys you can’s set a perfect beat and a perfect run in a cross-tide situation • Compromise • In all but the most extreme situations it is possible to produce a good compromise Wind and Tide

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  34. Summary so far…. Wind and Tide

  35. Sailing Wind • The Sailing Wind is that experienced by a free-floating stationary boat Wind and Tide

  36. Sailing Wind • The Sailing Wind is that experienced by a free-floating stationary boat • Upwind • The Sailing Wind is always influenced by the tide • The COG and SOG is always influenced by the tide • The two effects are additive Wind and Tide

  37. Sailing Wind • The Sailing Wind is that experienced by a free-floating stationary boat • Upwind • The Sailing Wind is always influenced by the tide • The COG and SOG is always influenced by the tide • The two effects are additive • Downwind • The Sailing Wind is always influenced by the tide • The COG and SOG is always influenced by the tide • The two effects are subtractive Wind and Tide

  38. Startlines • Unbiased starting lines are set at 90 degrees • to the sailing wind Wind and Tide

  39. Startlines • Unbiased starting lines are set at 90 degrees • to the sailing wind • Course Axis • Unbiased legs are set based on VMG with equal time on each tack Wind and Tide

  40. Wind and Tide

  41. What can go wrong? Wind and Tide

  42. The Naive Race Officer Wind and Tide

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  44. The Very Naive Race Officer • I’m not suggesting any of you would do this….. But • If using our original scenario, we put the windward mark directly upwind of the committee boat using a wind reference from the Committee boat (Ground Wind) • 60 seconds on long tack • Time on short tack a) 40 seconds • b) 22 seconds • c) 17 seconds Wind and Tide

  45. The Very Naive Race Officer • I’m not suggesting any of you would do this….. But • If using our original scenario, we put the windward mark directly upwind of the committee boat using a wind reference from the Committee boat (Ground Wind) • 60 seconds on long tack • Time on short tack • c) 17 seconds Wind and Tide

  46. Vector Changes Wind and Tide

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