The resistance caused by the friction of the air along a surface.
Applied to propeller action, the slip is the difference between the actual advance of an aircraft and the theoretical advance calculated from the product of the mean pitch and the revolutions per minute. When the propeller is held stationary, the slip is said to be 100 percent.
The wind stream thrown by a propeller.
The sustentation of a wing surface due to wind currents and without the expenditure of other power. Soaring flight is performed by gulls, buzzards and vultures, but no practical machine has yet been built that will fly continuously without the aid of power.
The length or longest dimension of a wing, generally taken at right angles to the wind stream.
The main wing beams that transmit the lift to the body.
(Fr. Rayon.)
See SPAN.
The property of an aircraft that causes it to return to a condition of equilibrium after meeting with a disturbance in flight.
The advance of the leading edge of the upper wing over that of the lower wing.