Wires are attached to the
eyebolts and the required degree of tension is secured by means
of rotating the barrel.
Thrust, Propeller--See ``Air-Screw.''
Undercarriage--That part of an aeroplane beneath the fuselage or
nacelle, and intended to support the aeroplane when at rest, and
to absorb the shock of alighting.
Velocity--Rate of displacement; speed.
Volplane--A gliding descent.
Weight--Is a measure of the force of the Earth's attraction (gravity)
upon a body. The standard unit of weight in this country is
1 lb., and is the force of the Earth's attraction on a piece of platinum
called the standard pound, deposited with the Board of Trade
in London. At the centre of the Earth a body will be attracted
with equal force in every direction. It will therefore have no
weight, though its mass is unchanged. Gravity, of which weight
is a measure, decreases with increase of altitude.
Web (of a rib)--That vertical part of a rib which prevents it from
bending upwards.
Warp, to--To distort a surface in order to vary its angle of incidence.
To vary the angle of incidence of a controlling surface.
Wash--The disturbance of air produced by the flight of an aeroplane.
Wash-in--An increasing angle of incidence of a surface towards its
wing-tip.
Wash-out--A decreasing angle of incidence of a surface towards its
wing-tip.
Wing-tip--The right- or left-hand extremity of a surface.
Wire--A wire is, in Aeronautics, always known by the name of its
function.
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