Measuring and testing – Navigation – Leeway incidence or side-slip
Patent
1977-09-21
1979-04-03
Ciarlante, Anthony V.
Measuring and testing
Navigation
Leeway incidence or side-slip
G01W 100
Patent
active
041470575
ABSTRACT:
An anemometer for measuring the component of air or of a similar fluid speed along its axis of rotation, in which the anemometer has a plurality of generally radially directed, helicoidal airfoils. The airfoil effect is produced by the helicoidal twisting which results in a vacuum being produced on one side thereof according to the direction of rotation. Each of the airfoils has a plurality of helicoidal edges, each edge being formed by the intersections of two or more plane surfaces so as to form airfoils having parallelogram or substantially parallelogram cross-sections. Each airfoil extends outwardly from a rotatable hub and is attached to the hub at its inner end but is spaced in part from the hub by a cutout area, such as a slot across the airfoil.
The spaces formed along the surfaces of the hub cause each airfoil to effectively perform as a true airfoil with trailing vortices produced at the airfoil tip and next to the hub as a result of the aerodynamic lift forces on the blades, whereby the blades respond accurately to the component of wind along the axis of rotation.
REFERENCES:
patent: 2149951 (1939-03-01), Baker
patent: 2422098 (1947-06-01), Heintzelman
patent: 3175152 (1965-03-01), Shafer
patent: 3208275 (1965-09-01), Thornthwaite et al.
patent: 3397869 (1968-08-01), Webster
patent: 3820918 (1974-06-01), Goldstein
patent: 3823611 (1974-07-01), Rudow et al.
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