Lifting surfaces and associated method
First Claim
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1. An arrangement of lifting surfaces comprising:
- a primary lifting surface including a flexural axis extending in the spanwise direction of the primary lifting surface, a root, and a tip;
a first tip device attached to the tip and including a first lifting surface, anda second tip device attached to the tip and having a second lifting surface, anda control system coupled to the first and second tip devices configured to move the first and second lifting surfaces relative to the tip by moving at least one of the first and second tip devices relative to the primary lifting surface or actively control circulation of the first and second lifting surfaces;
wherein the control system is configured to operate in a first mode to operably change a value of torque effective at the primary lifting surface about the flexural axis by actively controlling the first or second lifting surfaces while maintaining a substantially constant value of lift generated by the first and second tip devices.
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Abstract
An arrangement of lifting surfaces including a primary lifting surface having a flexural axis extending in the spanwise direction of the lifting surface, a root, and a tip. A first tip device is attached to the tip and has a first lifting surface. A second tip device is attached to the tip and has a second lifting surface. A control system is coupled to the first and second tip devices for moving the first and second lifting surfaces relative to the tip or for actively controlling circulation of the first and second lifting surfaces. The control system is operable to change a value of torque effective at the primary lifting surface about the flexural axis.
20 Citations
38 Claims
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1. An arrangement of lifting surfaces comprising:
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a primary lifting surface including a flexural axis extending in the spanwise direction of the primary lifting surface, a root, and a tip; a first tip device attached to the tip and including a first lifting surface, and a second tip device attached to the tip and having a second lifting surface, and a control system coupled to the first and second tip devices configured to move the first and second lifting surfaces relative to the tip by moving at least one of the first and second tip devices relative to the primary lifting surface or actively control circulation of the first and second lifting surfaces; wherein the control system is configured to operate in a first mode to operably change a value of torque effective at the primary lifting surface about the flexural axis by actively controlling the first or second lifting surfaces while maintaining a substantially constant value of lift generated by the first and second tip devices. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29)
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30. A method of controlling an arrangement of lifting surfaces, the arrangement comprising:
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a primary lifting surface having a flexural axis extending in a spanwise direction of the primary lifting surface, a root, and a tip; a first tip device attached to the tip and having a first lifting surface; and
a second tip device attached to the tip and having a second lifting surface, anda control system coupled to the first and second tip devices; the method comprising a first mode of operation which includes at least one of a) moving at least one of the first and second lifting surfaces relative to the tip, and b) actively controlling circulation of the first and second lifting surfaces, wherein the first mode of operation changes a value of torque effective at the primary lifting surface about the flexural axis, while maintaining a substantially constant value of lift generated by the first and second tip devices. - View Dependent Claims (31, 32, 33, 34, 35, 36, 37, 38)
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Specification