Air data computer

Claim 1

AIR DATA COMPUTING APPARATUS COMPRISING, IN COMBINATION: PRESSURE TRANSDUCING MEANS HAVING A MEMBER MOVABLE FROM A NULL POSITION UPON VARIATIONS OF PRESSURE DIFFERENTIAL BEWEEN TOTAL PRESSURE AND STATIC PRESSURE, SUPPLYING AN OUTPUT SIGNAL WHENEVER THE MEMBER MOVES FROM THE NULL POSITION AND HAVING A REBALANCE CONNECTION OPERABLE TO PROVIDE A SIGNAL TO REPOSITION THE MEMBER TO THE NULL POSITION, THE SIGNAL PROVIDED BY THE REBALANCE CONNECTION THEN BEING INDICATIVE OF PRESSURE DIFFERENTIAL BETWEEN TOTAL PRESSURE AND STATIC PRESSURE; MOTOR MEANS CONNECTED TO SAID PRESSURE TRANSDUCING MEANS AND OPERABLE IN ACCORDANCE WITH THE OUTPUT SIGNAL THEREFROM; FIRST CHARACTERIZED MEANS CONNECTED TO SAID MOTOR MEANS, SAID FIRST CHARACTERIZED MEANS BEING SO CHARACTERIZED AS TO DERIVE A SIGNAL INDICATIVE OF THE DIFFERENCE BETWEEN THE LORGARITHM OF STATIC PRESSURE AND THE LOGARITHM OF PRESSURE DIFFERENTIAL FROM A SIGNAL INDICATIVE OF MACH NUMBER; A SOURCE OF SIGNAL INDICATIVE OF THE LOGARITHM OF STATIC PRESSURE; DIFFERENTIAL MEANS CONNECTED TO SAID FIRST CHARACTERIZED MEANS AND TO SAID SOURCE OF SIGNAL AND OPERABLE TO DERIVE A SIGNAL INDICATIVE OF THE LOGARITHM OF PRESSURE DIFFERENTIAL FROM SIGNALS INDICATIVE OF THE LOGARITHM OF STATIC PRESSURE AND OF THE DIFFERENCE BE-