See PROPELLER.
An instrument used for determining the height of aircraft above the earth.
Height of aircraft above sea level—generally given in feet.
An aeroplane equipped with landing gear for both land and water.
An instrument for measuring the velocity of the wind.
The angle made by a surface or body with an air stream. In the case of curved wings, the angle is measured from the chord of the curve.
See Angle of Incidence.
The angle made with the chord of a wing section by a line drawn tangent to the upper curved face, and at the front edge.
The angle made by a line drawn tangent to the upper surface at the trailing edge.
An instrument used for graphically recording the velocity of air currents.