A capture device at the tip of a fluid foil such that when the foil has relative motion with respect to fluid in which it is immersed the capture device intercepts a quantity of the crossflow which is generated by the difference in pressure on the lower surface relative to the upper surface so that lift-induced drag is reduced thereby. The capture device comprises a curved plate having its concave side facing inward toward the foil center span to form an inlet, and an aspirating device for venting off the lower surface crossflow inducted by the capture device. Conventional pumping can be used to aspirate the capture device or a winglet having a passage connecting the capture inlet with a slot opening on a low pressure region of the winglet can be utilized for the purpose.

Wing tip flow control

A method and apparatus for boundary layer control by sucking air off the vortex chambers established in the trailing-edge portion of an aircraft aerodynamic surface. The rate of air bleed is controlled first by increasing it until the boundary layer is attached to the airstreamed surface, then by decreasing the rate of air bleed until the pressure in the trailing-edge aircraft portion starts decreasing. The aircraft equipped with the boundary layer control system, including a number of vortex chambers accommodating streamlined bodies and communicating, through a common passage and a receiver, with a low-pressure source.

Method for control of the boundary layer on the aerodynamic surface of an aircraft, and the aircraft provided with the boundary layer control system

Method and apparatus for modifying airfoil fluid flow

In accordance with the present invention, there is provided a pair of opposing wings for providing aircraft directional stability of a delta-shaped aircraft having a longitudinal axis Each wing is provided with a substantially straight swept-back leading edge Each wing is further provided with a lower surface which extends aft from the leading edge A lower airflow channeling portion is formed into the lower surface The lower airflow channeling portion is generally elongate and concave and is disposed substantially parallel to the longitudinal axis of the aircraft for channeling airflow substantially parallel thereto

Swept-back wings with airflow channeling

Aerodynamic-flow reverser and smoother

Boundary layer control system

Dispositif de supersustentation et de diminution de résistance à l'avancement des corps dans les fluides

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Boundary layer control system

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Wing tip flow control

Method for control of the boundary layer on the aerodynamic surface of an aircraft, and the aircraft provided with the boundary layer control system

Method and apparatus for modifying airfoil fluid flow

Swept-back wings with airflow channeling

Aerodynamic-flow reverser and smoother

References

Dispositif de supersustentation et de diminution de résistance à l'avancement des corps dans les fluides

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