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Airspeed and relative direction indicator

  • US 4,170,132 A
  • Filed: 12/16/1977
  • Issued: 10/09/1979
  • Est. Priority Date: 12/16/1977
  • Status: Expired due to Term
First Claim
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1. An apparatus for installation in an aircraft for providing a single visual display of the direction of airflow relative to the fore and aft axis of the aircraft and also the speed of airflow relative to a sensor mounted at a desired location comprising a face panel fixed in the aircraft including an annular array of first indicia indicating increasing relative airflow speed in clockwise direction from a zero reference point on a desired axis of the face panel, a first pointer needle rotatably mounted relative to the face panel for association with said first indicia, means coupling the sensor to the first pointer needle to rotate the first pointer needle in response to measured airflow speed values relative to said face panel and said first indicia, a second pointer needle rotatably mounted with respect to the face panel, about a substantially central axis on the face panel, means responsive to sensed airflow at the sensor and coupled to the second pointer needle to rotate the second pointer needle to indicate relative direction of airflow at said sensor with respect to the aircraft fore and aft axis, and second indicia representing a known aircraft configuration fixed on said face panel and separately identifiable from said annular array of first indicia and associated with said second pointer needle, said second indicia being oriented so the known aircraft configuration fore and aft axis corresponds to the fore and aft axis on the aircraft in which the face panel is mounted, and the zero reference point for the first indicia is aligned with the leading end of the known aircraft configuration to provide direct indication of the relative direction of airflow with respect to the known aircraft configuration.

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