| 1. | Alpha is the angle of the sails to the apparent wind.
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| 2. | In this figure, the apparent wind and the true wind are at right angles.
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| 3. | Alpha is the angle of the apparent wind.
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| 4. | Torque is caused by a change in the apparent wind direction relative to the moving blades.
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| 5. | Alpha is again the closest angle to the apparent wind at which the boat can sail.
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| 6. | The calculation assumes that the boat accelerates until the apparent wind is alpha degrees off the bow.
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| 7. | The effect of this is to radically change the apparent wind direction when sailing " downwind ".
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| 8. | For apparent wind angles behind the sail, lift diminishes and drag increases as the predominant component of propulsion.
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| 9. | The apparent wind speed is influenced by both the free-stream velocity of the air, and the rotor speed.
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| 10. | This is the depiction of the apparent wind speed, as seen by a blade ( left of figure ).
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