Measuring and testing – Navigation – Leeway incidence or side-slip
Patent
1974-06-06
1976-11-16
Queisser, Richard C.
Measuring and testing
Navigation
Leeway incidence or side-slip
73204, C01W 104
Patent
active
039916243
ABSTRACT:
A servo system employs a dual element wind direction sensor mounted on a rotatable support that can be driven in opposite directions by a reversible motor. The sensor employs a pair of closely spaced, elongate, hot wire elements that extend side by side along the sensor's longitudinal axis. The hot wire elements are heated to a temperature that is a fixed amount above the ambient temperature. The two hot wire elements are equally ventilated only when the wind blows directly along the longitudinal axis of the sensor. Because the resistance of the hot wire elements varies with temperature, an unabalance signal is generated when the elements are unequally ventilated by an "off-axis" wind. The unbalance signal causes the motor to turn the rotatable support to the position where the wind is directed along the sensor's longitudinal axis. Consequently the servo system acts to keep the longitudinal axis of the sensor pointed into the wind.
REFERENCES:
patent: 2736198 (1956-02-01), Kuhn
patent: 3352154 (1967-11-01), Djorup
patent: 3592055 (1971-07-01), Dorman
patent: 3603147 (1971-09-01), Dorman
patent: 3604261 (1971-09-01), Olin
patent: 3677085 (1972-07-01), Hayakawa
patent: 3686937 (1972-08-01), Corey
"Hot Wire Probe Calibration Equations for Air Velocity, Direction and Temperature"; Flow Corporation; Bulletin 11D; Dec., 1964.
Appleman John S.
Queisser Richard C.
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