Edge, Leading--The front edge of a surface relative to its normal
direction of motion.
Edge, Trailing--The rear edge of a surface relative to its normal
direction of motion.
Factor of Safety--Usually taken to mean the result found by dividing
the stress at which a body will collapse by the maximum stress
it will be called upon to bear.
Fineness (of stream-line)--The proportion of length to maximum width.
Flying Position--A special position in which an aeroplane must be
placed when rigging it or making adjustments. It varies with
different types of aeroplanes. Would be more correctly described
as ``rigging position.''
Fuselage--That part of an aeroplane containing the pilot, and to which
is fixed the tail-plane.
Fin--Additional keel-surface, usually mounted at the rear of an
aeroplane.
Flange (of a rib)--That horizontal part of a rib which prevents it
from bending sideways.
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 aluminum, 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.
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.
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