| 11. | Using a moderately sized sail, a foil windboard can achieve speeds over 6 knots faster than the apparent wind.
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| 12. | Additionally, as their speed increases on the broad reach, their apparent wind changes to allow them to point lower.
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| 13. | Figure 1 shows the relationship of the true wind and apparent wind vectors as differing by the yacht velocity.
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| 14. | The 4000 is fast enough to make use of the apparent wind to reach the bottom of the racecourse sooner.
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| 15. | Depending on the alignment of the sail with the apparent wind, lift or drag may be the predominant propulsive component.
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| 16. | On running the spinnaker is angled for maximum drag, with the spinnaker pole at right angles to the apparent wind.
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| 17. | The Windex, a wind indicator that measures the apparent wind generated by a boat's movement across water, was their invention.
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| 18. | Pressure differences result from is the chord line of the sail and the apparent wind velocity ( "'V A "').
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| 19. | These devices can be calibrated to measure the true wind speed and the apparent wind speed ( speed that a sailor would'feel').
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| 20. | Also note that the optimum speed sailing angle is equal to the apparent wind angle ( Beta ) below a beam reach.
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