Actuated forebody strakes
AssigneeThe United States of America as represented by the Administrator of the National Aeronautics and Space Administration
InventorDaniel G. Murri
Life of this patent
Estimating the term…
Abstract
Actuated forebody strakes provide yaw control at high angles of attack. In one embodiment, the strakes are axially slidable in the forebody to be deployed out of slots provided for the strakes in the forebody. In another embodiment, the strakes are pivotally connected at the tip of the strakes to pivot radially outwardly out of the slots provided in the forebody. In another embodiment, the forebody is provided with either a single strake or two strakes and the forebody is rotatable to vary the radial location of the strake or strakes. All embodiments achieve significant yaw control capability over a wide angle of attack and sideslip ranges.
Claims10
An apparatus for controlling yawing moment of an aircraft having a forebody, the apparatus comprising:
- a first strake mounted for movement in and out of the forebody;
- a second strake mounted for movement in and out of the forebody;
- the first and second strakes being symmetrically disposed and movable between alternative positions including a position where both strakes are simultaneously fully projectable radially outwardly from the forebody, a position where both strakes are simultaneously fully retractable inside the forebody, and a plurality of positions where the strakes are differentially projectable where one strake is projectable outwardly to varying widths and the other is fully retractable;
- the first and second strakes being slidably connected to the forebody for sliding axially in a nd out of the forebody in a fore and aft direction.
An apparatus for controlling yawing moment of an aircraft having a forebody, the apparatus comprising:
- a first strake being slidably supported in the forebody for axial movement in a fore and aft direction;
- and
- a second strake being slidably supported in the forebody for axial movement in a fore and aft direction;
- the first and second strakes being symmetrically disposed and movable between alternative positions including a position where both strakes are simultaneously fully projectable radially outwardly from the forebody, a position where both strakes are simultaneously fully retractable inside the forebody, and a plurality of positions where the strakes are differentially projectable where one strake is projectable outwardly to varying widths and the other is fully retractable.
An apparatus for controlling yawing moment of an aircraft, comprising:
- a forebody rotatably connected to a forward portion of the aircraft;
- at least one strake connected to the forebody and extending radially outwardly therefrom, and having a normal symmetric radial location which is variable to effect yaw control by rotating the forward portion of the forebody.
Dependencies are inferred from the claim text.