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5178348 |
Contoured wing/flap assembly and method
A wing flap assembly having a contoured upper forward surface portion of the flap being arranged to reduce adverse effects of a wake producing device, such as a landing gear or a flap track faring,...
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5167387 |
Porous airfoil and process
A porous airfoil having venting cavities with contoured barrier walls, formed by a core piece, placed beneath a porous upper and lower surface area that stretches over the nominal chord of an...
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5156362 |
Jet engine fan nacelle
A jet engine fan nacelle which maintains attached flow during engine windmilling. The nacelle includes a cylindrical airfoil body having an inner surface. A plurality of vortex generators are...
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5133516 |
Drag reduction article
A conformable drag reduction article is provided having a patterned surface capable of reducing drag resistance by fluid flowing thereover.
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5133519 |
Drag reduction method and surface
Rearward facing microsteps (11, 12, 20, 21) are provided in a wall surface (10, 10a, 10b, 19, 19a, 19b) to reduce shear friction drag caused by wall surface bounded turbulent shear flows....
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5114099 |
Surface for low drag in turbulent flow
A nonsmooth surface of an object in a fluid flowstream permits a reduction of turbulent drag. The surface shape is designed to approximate a minimal surface and satisfies the equation...
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5088665 |
Serrated trailing edges for improving lift and drag characteristics of lifting surfaces
An improvement in the lift and drag characteristics of a lifting surface is achieved by attaching a serrated panel to the trailing edge of the lifting surface. The serrations may have a saw-tooth...
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5074234 |
Vortex generators for sails
A vortex generator for attachment to the surface of a sail of a sailboat made from a strip of foldable material such as sail cloth or film that has a central member formed of two panels of the...
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5069402 |
Alleviation of aircraft fuselage form drag
An aircraft having an upswept tail section fuselage includes a single pair of large vortex generators mounted in the vicinity of the break in the fuselage ahead of or at the beginning of the tail...
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5058837 |
Low drag vortex generators
A generally V-shaped device (40) that is installed on a surface (48) over which there is a flowing medium (50) whose viscosity causes a boundary layer to form between free-stream medium and the...
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5054412 |
Hydrodynamic skin-friction reduction
A process for reducing skin friction, inhibiting the effects of liquid turbulence, and decreasing heat transfer in a system involving flow of a liquid along a surface of a body includes applying a...
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5054720 |
Trapped vortex cavity
An airfoil having a trailing edge member pivotally connected to a leading edge member. The trailing edge member having a vortex generating cavity that can be exposed or concealed from a stream of...
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5037044 |
Aerodynamic or hydrodynamic surfaces
An aerodynamic or hydrodynamic surface having a swept-back leading edge includes at least one flow separation device located on an attachment line of the leading edge, such as a step-up, step-down,...
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4932612 |
Method and apparatus for reducing turbulent skin friction
A method and apparatus for reducing the skin friction on objects in relative motion to a field of fluid. The areas of relative low speed motion are fixed to align with a series of ridges on the...
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4913381 |
Aerodynamic components having leading edge devices
In modern thin wing aircraft flow separation at high incidence may originate at the leading edge. This invention combats the problem by restricting the growth of the region of separated flow by...
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4907765 |
Wall with a drag reducing surface and method for making such a wall
A wall having a surface in contact with a fluid, has a surface configuration which reduces drag if there is relative movement between the surface and the fluid. The wall is made of metal or of...
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4836473 |
Apparatus for influencing a boundary layer on the surface of a body moving through a medium
The pressure drag on the skin of an aircraft is reduced by rigidly securing boundary layer influencing members to the skin of the aircraft, including the wings, the elevantor and fin/rudder...
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4830315 |
Airfoil-shaped body
An airfoil-shaped body has a relatively thin trailing edge with a series of alternating, adjoining, downstream extending troughs and ridges in its suction surface which form wave-like surface...
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4813635 |
Projectile with reduced base drag
A projectile having a downstream extending surface of revolution which terminates as a blunt base has a plurality of circumferentially spaced apart U-shaped, downstream extending troughs in its...
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4802642 |
Control of laminar flow in fluids by means of acoustic energy
Retarding of the point of transition from laminar flow to turbulent flow in aerodynamic boundary layers on the surfaces of aircraft is accomplished by radiating acoustic energy at frequencies...
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4795308 |
Obstacle in front of a propeller
In combination with a propeller disposed in an aircraft, aft from the nose portion of the craft, an improvement is provided for reducing noise, as well as mechanical load on the propeller blade,...
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4776535 |
Convoluted plate to reduce base drag
A body adapted to move downstream through a fluid has a downstream extending smooth surface terminating at a blunt base. Extending transversely across the smooth surface and disposed upstream of...
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4759516 |
Cascaded turbulence generation inhibitor
A turbulence generation inhibitor comprising a fluid conduit having an interior wall surface with the interior wall surface having a plurality of spaced-apart microscopic grooves formed therein...
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4753401 |
Surface, exhibiting reduced flow resistance, of a body over which turbulent flow takes place
The surface of the body is provided with grooves (5), which extend in the flow direction and which are separated from one another by ribs (4) which are constructed to have sharp edges. The surface...
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4750693 |
Device for reducing the frictional drag of moving bodies
A device for reducing the frictional drag inherent in flow mechanics in airborne, waterborne and space vehicles in which the surface of a body in a flowing medium is provided with an asymmetrical...
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4736912 |
Apparatus for reducing turbulent drag
The turbulent drag is reduced on the surface of a body moving through a fluid by providing longitudinal channels in the surface, for example of an aircraft wing, which channels extend in parallel...
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4718620 |
Terraced channels for reducing afterbody drag
A fluid flow control for reducing the drag associated with an upswept afterbody includes a pair of ridges forming substantially symmetric flow channels arranged in an approximately helical fashion...
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4706910 |
Combined riblet and lebu drag reduction system
The invention is a system of flow control devices which result in reduced skin friction on aerodynamic and hydrodynamic surfaces. The devices cause a breakup of large-scale disturbances in the...
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4699340 |
Laminar vortex pump system
Streamwise ridges on a lifting wing intercept local flow consisting of free stream and spanwise crossflow to create a pattern of vortices over the wing and aligned with the ridge axes; the vortices...
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4696442 |
Vortex generators for inlets
A pair of vortex generators are attached to the exterior surface of an aircraft and located forwardly of a flush inlet so as to effectively remove or reduce the thickness of a slower-moving...
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4671474 |
Fluid control apparatus and method utilizing cellular array containing mini-vortex flow patterns
An apparatus for controlling flow over a surface, especially transonic flow, including means for embedding within the surface small vortices with their axes parallel to said surface and transverse...
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4664345 |
Method for stabilizing laminar separated boundary layers
Separated laminar flow boundary layers are stabilized by delaying a transition into a turbulent flow and by reducing the size of the laminar boundary layer separation zone downstream of a...
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4655419 |
Vortex generator
A vortex generator mounted to an upper lifting surface of an airfoil, and having an upstanding generally planar vortex generating member. The forward edge portion of the member slants first...
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4650138 |
Cascaded micro-groove aerodynamic drag reducer
A cascaded micro-groove aerodynamic drag reducer is provided by creating a plurality of spaced-apart, microscopic grooves in the aerodynamic surface. Each of the grooves is defined by oppositely...
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4643376 |
Shock inducing pod for causing flow separation
A wing-mounted pod for preventing an unstable increase in the pitching moment of a swept-wing aircraft due to increasing speed and angle of attack is disclosed. This invention is for use on a...
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4632340 |
Device for protecting parked aircraft
A removeable spoiler is described for reducing the wing lift of parked aircraft. It includes a spoiler member in the form of a strip temporarily mountable to stand upright and project into the...
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4619423 |
Geometries for roughness shapes in laminar flow
This invention is for a passive laminar flow airfoil which has an upper skin 12 and lower skin 14 joined at a trailing edge 16. A leading edge structure 20, such as de-icing equipment, is joined to...
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4606519 |
Airfoil
An airfoil having improved aerodynamic characteristics incorporates a leading edge (13) and a trailing edge (14) longitudinally displaced therefrom. A continuous lower surface (21), defining the...
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4571192 |
Self propelled spherical vehicle
A self-propelled spherical vehicle (10) for operation in a fluid medium utilizes an impeller (12) of approximately half the diameter of the sphere for propulsion. In addition to driving the...
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4542868 |
Trailing edge device for an airfoil
The invention is a small wedge shaped flap (20) for attachment to or near the trailing edge (14) of a airfoil (10) which improves the coefficient of lift and reduces the coefficient of drag...
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4489905 |
Nacelle-pylon configuration for an aircraft and method of using the same
A below-wing engine nacelle mounted by a pylon forwardly of a wing having a rearward sweep. The pylon upper outboard edge that extends forwardly of the wing is formed with a relatively sharp radius...
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4455045 |
Means for maintaining attached flow of a flowing medium
One or more channels whose edges generate streamwise vortices from heights coincidental with a local flow-control surface into the channels are used to maintain attached flow of a fluid medium...
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4434957 |
Low drag surface
A low drag surface comprises at its upstream edge an intermittent linear vortex producing means extending transverse to the flow of fluid across the surface. The vortex producing means produces a...
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4377982 |
Spherical vehicle for operation in a fluid medium
A spherical vehicle for operation in a fluid medium utilizes an impeller of approximately half the diameter of the sphere for propulsion. In addition to providing the energy for driving the sphere,...
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4354648 |
Airstream modification device for airfoils
An airfoil modification device that helps maintain airstream attachment to either upper or lower airfoil surfaces, the device in the form of a plurality of spaced, low profile rods arranged...
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4334658 |
Stalling aerodynamics of the Cessna models 150 and 152 series aircraft
A pair of metallic strips are provided for the improvement in the stalling aerodynamics of the Cessna Series 150 and 152 aircraft, especially during conditions which would otherwise generate an...
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4314681 |
Drag-reducing component
A drag-reducing structure is provided on a pylon that suspends a wing-mounted engine. The structure reduces drag by preventing ambient airflow, in a region between the wing, pylon, and engine, from...
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4291853 |
Airplane all-moving airfoil with moment reducing apex
Disclosed is an airplane all-moving airfoil having a moment reducing apex for facilitating control of the airfoil. In a preferred embodiment, the apex protrudes forward from the leading edge of an...
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4174083 |
Flow deflector for fluid inlet
To enhance the flow of air into a flush-type, air inlet on the fuselage of an aircraft, a wing-like deflector is mounted on a pedestal attached to the aircraft and is positioned outwardly from the...
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4121787 |
Aircraft
A supercritical wing section having a large average leading edge radius of curvature, followed on the upper surface by a reduction in curvature and then a knee, or region of positively increased...
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