Airplanes for vertical and/or short take-off and landing

Claim 1

AN AIRPLANE COMPRISING A FUSELAGE, WING MEANS FIXEDLY MOUNTED ON SAID FUSELAGE, A PLURALITY OF PROPELLER UNITS AT EACH SIDE OF THE LONGITUDINAL AXIS OF THE AIRPLANE, AND MEANS SUSPENDING SAID PROPELLER UNITS FROM SAID WING MEANS LOCATED SO THAT THE PROPELLER UNITS AT OPPOSITE SIDES OF THE LONGITUDINAL AXIS OF THE AIRPLANE ARE ARRANGED SYMMETRICALLY ABOUT SUCH AXIS, THE NUMBER OF PROPELLER UNITS FORWARD OF THE CENTER OF GRAVITY OF THE AIRPLANE IS EQUAL TO THE NUMBER OF PROPELLER UNITS AFT OF SUCH CENTER OF GRAVITY AND THE DISTANCES OF THE FORWARD PROPELLER UNITS FROM SUCH CENTER OF GRAVITY CORRESPOND RESPECTIVELY TO THE DISTANCES OF THE AFT PROPELLER UNITS FROM THE CENTER OF GRAVITY, SAID SUSPENDING MEANS INCLUDING MOUNTING MEANS RESPECTIVELY SUPPORTING PROPELLER UNITS FOR SWINGING ABOUT RESPECTIVE AXES EXTENDING ATHWARTSHIPS OF THE AIRPLANE AND TILTED TO SLOPE DOWNWARDLY TOWARD THE LONGITUDINAL CENTRAL VERTICAL PLANE OF THE AIRPLANE TO ALTER THEIR THRUST DIRECTIONS BETWEEN GENERALLY HORIZONTAL FORWARD AND PRINCIPALLY VERTICAL UPWARD, AND THE THRUST DIRECTIONS BEING INCLINED UPWARDLY TOWARD SUCH PLANE TO STABILIZE THE AIRPLANE BY DETERRING ROLL WHEN IT IS BEING LIFTER PRINCIPALLY BY THE COMBINED THRUSTS OF SAID PROPELLER UNITS.