Rotatable nose and nose boom strakes and methods for aircraft st

Details Rotatable nose and nose boom strakes and methods for aircraft st Rotatable nose and nose boom strakes and methods for aircraft st

1990-06-08

1993-05-04

Peters, Jr., Joseph F.

Aeronautics and astronautics

Aircraft sustentation

Sustaining airfoils

244329, 244206, F42B 1000, B64C 3912, B64C 2302

Patent

active

052073971

ABSTRACT:
Methods and apparatus for stability and maneuver control using rotatable nose strakes to control forebody vortices at medium to high angles of attack are disclosed. In one form, small left and right nose strakes are supported on a member or members forming the forward most contours of the forebody. Supporting of the two strakes on a single member allows rotation of the two in unison, the angular position thereof controlling the asymmetry of the forebody vortices at higher angles of attack, while support of each strake on a separate forebody nose member allows individual strake control for the same purpose. In another embodiment, the strakes may be mounted on a nose boom for rotation about the axis of the nose boom, whereby rotation of the strakes about the nose boom axis affects the development of the forebody vortices and the asymmetry thereof. Various embodiments and methods of operation thereof are disclosed.

REFERENCES:
patent: 4010920 (1977-03-01), Farner
patent: 4378922 (1983-04-01), Pierce
patent: 4786009 (1988-11-01), Rao et al.
"Enhanced Departure/Spin Recover of Fighter Aircraft through Control of the Forebody Vortex Orientation", W. A. Moore, A. M. Skow & D. J. Lorincz, Northrop Corp., AIAA 18th Aerospace Sciences Meeting, Pasadena, Calif. Jan. 14-16, 1980.
"A Survey of Analytical & Experimental Techniques to Predict Aircraft Dynamic Characteristics at High Angles of Attack", A. M. Skow & A. Titiriga, Jr., Northrop Corp., The Fluid Dynamics Panel Mtg. on Dynamic Stability Parameters, Athens, Greece, May 22-24, 1978.
"Application of Forebody Blowing for Vortex Manipulation of the F-16", T. Terry Ng, Eidetics International, TR 90-001, Jan. 1990.
"Aerodynamic Control Using Forebody Strakes", T. T. Ng, & G. N. Malcolm, Eidetics International, Inc., 29th Aerospace Sciences Meeting, Reno, Nev., Jan. 7-10, 1991.
"Forebody Vortex Control with Miniature Rotatable Nose-Boom Strakes", C. Suarez, G. Malcolm & T. Ng, 30th Aerospace Sciences Meeting & Exhibit, Reno, Nev., Jan. 6-9, 1992.

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