Method and apparatus for preventing complete stalls of an aircraft at slow speeds

Claim 1

FOR USE IN AN AIRCRAFT HAVING A CENTER OF GRAVITY, THE COMBINATION COMPRISING, (A) A STABILIZER, SAID STABILIZER BEING MOVEABLY MOUNTED ON THE AIRCRAFT AND ADAPTED TO BE MOVED WITH CHANGES OF THE AIRCRAFT CENTER OF GRAVITY LOCATION FROM A NORMAL POSITION FOR TRIMMING THE AIRCRAFT IN PITCH, (B) AN ELEVATOR, SAID ELEVATOR BEING MOVEABLY MOUNTED ON SAID STABILIZER FOR MOVEMENT THROUGH A SUBSTANTIAL DISTANCE BOTH ABOVE AND BELOW A NEUTRAL POSITION, (C) ELEVATOR LIMITING MEANS, SAID ELEVATOR LIMITING MEANS BEING RESPONSIVE TO SAID STABILIZER FOR CONTROLLING SAID ELEVATOR BY LIMITING UPWARD MOVEMENT OF SAID ELEVATOR TO A LESSER AMOUNT THAN SAID DISTANCE ABOVE SAID NEUTRAL POSITION WHEN THE AIRCRAFT CENTER OF GRAVITY IS AFT OF THE NORMAL POSITION OF THE CENTER OF GRAVITY, AND (D) SAID ELEVATOR LIMITING MEANS PROVIDING UNLIMITED DOWNWARD MOVEMENT OF SAID ELEVATOR THROUGH SAID DISTANCE BELOW SAID NEUTRAL POSITION SIMULTANEOUSLY WITH THE ABOVE LIMITING OF ELEVATOR UPWARD MOVEMENT.