Flight—The sustenance of a body heavier than air by means of its action upon the air.
Foot-pound—A measure of work representing the weight of 1 lb. raised 1 foot.
Fairing—Usually made of thin sheet aluminium, wood, or a light construction of wood and fabric; and bent round detrimental surface in order to give it a "fair" or "stream-like" shape. [15]
Gravity—Is the force of the Earth's attraction upon a body. It decreases with increase of distance from the Earth. See "Weight."
Gravity, Specific—
| Density of substance |
| Density of water. |
Thus, if the density of water is 10 lb. per unit volume, the same unit volume of petrol, if weighing 7 lb., would be said to have a specific gravity of 7/10, i.e., 0.7.
Gap (of an aeroplane)—The distance between the upper and lower surfaces of a biplane. In a triplane or multiplane, the distance between any two of its surfaces. [16]
Gap, Propeller—The distance, measured in the direction of the thrust, between the spiral courses of the blades.
Girder—A structure designed to resist bending, and to combine lightness and strength.