The efficiency of a lifting surface is generally expressed by the ratio of the lift to the drag, or the "Lift-drag ratio." The efficiency of a propeller is the ratio of the work usefully applied to the air stream in regard to the power supplied to the propeller.
The hinged horizontal tail surface used for maintaining longitudinal equilibrium and for ascent or descent.
The group of tail surfaces, including the elevator and stabilizer.
Dope.
According to the Advisory Board, an engine is turning in right-hand rotation when the output shaft stub is turning anti-clockwise.
The timbers or fuselage members upon which the engine is fastened.
A perforated metal support for a rotary cylinder motor.
The front edge, or air engaging edge, of an aerofoil or lifting surface. It is also called the "Leading Edge."
Wing fabric or covering.
The gas bag of a balloon or dirigible.