The variometer includes a measuring chamber communicating with the atmosphere through a first passageway and an elastically deformable measuring box, positioned within the measuring chamber, communicating with the atmosphere through a second passageway. One of the passageways, preferably the second passageway, is provided with a system of orifice inserts serving to delay pressure equalization between the measuring chamber and the measuring box. The system of orifice inserts includes at least two...

An indication of altitude variation about a preselected altitude is provided from a real time altitude information input signal in response to an altitude alert control signal which is proportional to a pair of complementary sinusoidal functions, sine and cosine, of the altitude variation. The uncorrected altitude information and the preselected altitude information are both fed to fine and coarse transolvers which each provide the sine and cosine functions of the angular equivalent of the altit...

Apparatus for providing an integrated display of flight instrument parameters on the screen of a single cathode ray tube is presented. The synthetically generated symbology is equivalent to that typically provided by ten conventional electromechanical instruments including an attitude-director indicator, horizontal situation indicator, pressure altimeter, radio altimeter, vertical speed indicator, radio magnetic indicator, Mach airspeed indicator, autopilot-flight director mode annunciator, load...

An electrooptical aircraft flight instrument that accepts input signals representing angle of attack and pitch angle. These signals are used to servo reticles that are projected at infinity upon a transparent screen in the pilot's normal line of sight and display the actual flight path of the aircraft and the angle, in degrees, between that flight path and the horizon.

An electrooptical aircraft flight instrument that accepts angle of attack input signals and displays upon a transparent screen in the pilot's normal line of sight and focused at infinity, the actual flight path of the aircraft through the air mass.

An aircraft navigation system which has a rectilinear navigation director with a fixed aircraft indicia and which continuously indicates the heading of the aircraft. The system also allows the setting of a waypoint or the use of a navigation station and the track may be set to fly to the waypoint or station, or at an offset distance, if desired.

The digital dual mode VOR indicator is a digital aircraft navigational instrument intended to replace the current dial or needle type VOR indicators. The new indicator has two modes of operation. In the first mode the instrument functions like a conventional omni while during the second mode of operation the VOR indicator constantly reads out the plane's bearing from the VOR station. The bearing information is displayed in a large three numeral, lighted, digital display. The invention covers the...

Apparatus for providing a contact analog display on a cathode-ray tube representing the horizon, ground plane grid lines in perspective, and a runway or other flight path reference in perspective, by intensity modulating the electron beam of the cathode-ray tube while it traces out a spiral raster. Center reference indicia and flight director bars may be generated during the retrace time of the raster.

A rho-theta relative position indicator for displaying separation and bearing with respect to a reference vehicle. From radar input parameters, the bearing of a lead or target vehicle is displayed as a pointer indication and separation is presented by the displacement of a second indicator along the bearing pointer axis, the combined display presenting location information for vehicle station keeping purposes.

An instrument for displaying pitch-and-roll attitude of an aircraft. A two-degree-of-freedom vertical gyroscope is suspended within a frame or housing, and is connected to an attitude indicator which moves in the same manner with respect to the frame and aircraft instrument panel as the aircraft moves in pitch and roll with respect to the earth. A novel linkage between the gyroscope and indicator transmits both pitch-and-roll position information over a single path to minimize the number of movi...