Inertia--The inherent resistance to displacement of a body as distinct
from resistance the result of an external force.
Joy-Stick--See ``Control Lever.''
Keel-Surface--Everything to be seen when viewing an aeroplane from
the side of it.
King-Post--A bracing strut; in an aeroplane, usually passing through
a surface and attached to the main spar, and from the end or ends
of which wires are taken to spar, surface, or other part of the
construction in order to prevent distortion. When used in connection
with a controlling surface, it usually performs the additional
function of a lever, control cables connecting its ends with the
pilot's control lever.
Lift--The vertical component of the reaction produced by the action
of driving through the air a surface inclined upwards and towards
its direction of motion.
Lift, Margin of--The height an aeroplane can gain in a given time and
starting from a given altitude.
Lift-Drift Ratio--The proportion of lift to drift.
Loading--The weight carried by an aerofoil. Usually expressed in
pounds per square foot of superficial area.
Longeron--The term usually applied to any long spar running length-
ways of a fuselage.
Mass--The mass of a body is a measure of the quantity of material
in it.
Momentum--The product of the mass and velocity of a body is known
as ``momentum.''
Monoplane--An aeroplane of which the main lifting surface consists
of one surface or one pair of wings.
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