More quickly than the wind
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Instead of using the couple of displacement center of butancy/centre of hull of the traditional sailing ships, it is more profitable use the weight directly and that the sum of the efforts on the wing in the air (aerofoil), on the wing in water (foil) and the weight are compensated. In this case, the propelling and lifting forces areapproximately equal to the weight of the boat (about 10 to 40 %, against 1 to 5% on a traditional sailing ship). Even with the wind on the beam, the sum of the effort of the aerofoil, the foil and the weight still leaves a capacity of acceleration. The machine is summarized with a
wing in water and a wing in the air. |
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The differents stages
of acceleration:
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| 1. To start, we take position wind on the beam. The low part of the wing is directed in the direction of the travel. The high part is directed in the direction of the wind. | 2. The boat accelerates a little, comes out of water the low part of the wing and directs it in the direction of the wind. | 3. The boat still accelerates and the apparent wind is directed towards beforewind on the beam. |
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| 4. The boat still accelerates, the apparent wind becomes stronger, until arriving at the limit of the output of the boat (to 30% of before in our example). | 5. The boat can still accelerate if she takes away from the wind, until having the real wind perpendicular to the apparent wind .She can arrive thus to twice the speed of the wind. | |
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text and diagrams:
Jean Marie Finot |