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Sighting apparatus for helicopters

  • US 3,886,306 A
  • Filed: 08/17/1973
  • Issued: 05/27/1975
  • Est. Priority Date: 08/17/1972
  • Status: Expired due to Term
First Claim
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1. A sighting apparatus for helicopters, comprising:

  • a closed circuit television system including a receiver having a screen, a camera;

    means for mounting said camera to the lower portion of the helicopter fuselage in such a manner as to furnish on the screen of said receiver an image of a zone located in the vicinity of the helicopter; and

    further means for the formation, on the image produced on the screen of said receiver, of a first straight line reference mark whose direction remains parallel to one of the axes of said screen and whose position is a function of the pitch angle of the helicopter and of a second straight line reference mark whose direction remains parallel to the other of the axes of said screens and whose position is a function of the roll angle of said helicopter.

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