Tail: The rear portion of an aircraft, to which are usually attached rudders, elevators, stabilizers, and fins.
Tail cups: The steadying device attached at the rear of certain types of elongated captive balloons.
Tandem: An airplane whose sets of planes are placed one in front of the other.
Tractor: See Airplane.
Trailing edge: The rearmost edge of an aerofoil or propeller blade.
Triplane: A form of airplane whose main supporting surface is divided into three parts, superimposed.
Truss: The framing by which the wing loads are transmitted to the body; comprises struts, stays, and spars.
Undercarriage: See Landing gear.
Venturi tube: A short tube, flaring at the front end, and constricted approximately midway of its length, so that, when fluid flows through it, there will be a suction produced in a side-tube opening into the constricted throat. This tube, when combined with a Pitot tube or with one giving static pressure, forms a pressure nozzle, which may be used as an instrument to determine the speed of an aircraft through the air.
Warp: To change the form of the wing by twisting it.