Airplane instrument for furnishing a bias signal to offset the effects of forward components of gusts during landing approach

Claim 1

FOR USE IN AN AIRPLANE INSTRUMENT THAT CONTROLS THE AIR SPEED OF AN AIRPLANE DURING LANDING APPROACH, MEANS TO FURNISH A BIAS SIGNAL TO COMMAND AN INCREASE IN AIR SPEED TO OFFSET THE EFFECT OF NEGATIVE GUSTS ON AIR SPEED DURING LANDING APPROACH, SAID MEANS COMPRISING A FIRST MEANS HAVING AN OUTPUT WHICH IS RESPONSIVE TO GUST ENGENDERED FLUCTUATIONS IN AIR SPEED, A SECOND MEANS HAVING AN OUTPUT WHICH IS A FUNCTION OF THE DIFFERENCE BETWEEN THE PREVAILING AVERAGE LIFT CONDITION OF THE AIRPLANE AND A PREDETERMINED DESIRABLE NULL LIFT CONDITION, THE OUTPUTS OF THE FIRST AND SECOND MEANS BEING IN THE SAME NEGATIVE SENSE FOR DECREASING AIR SPEED, A THIRD MEANS FOR COMPARING THE OUTPUTS OF THE FIRST AND SECOND MEANS AND FURNISHING A DIFFERENCE OUTPUT, AND AN INTEGRATOR RESPONSIVE TO AND FOR STORING SUBSTANTIALLY ONLY A NEGATIVE OUTPUT OF THE THIRD MEANS AS SAID BIAS SIGNAL, SUCH NEGATIVE OUTPUT CORRESPONDING TO AN APPROACH TO STALL.