[Gridrus-developer] urface i

[Azznara <pol...@wu...>]

Ecured 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. [37_a_] =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. [38] =Wash-out=--A decreasing angle of incidence
of a surface towards its wing-tip. [39] =Wing-tip=--The right or
left-hand extremity of a surface. [40] =Wire=--A wire is, in
Aeronautics, always known by the name of its function. =Wire, Lift or
Flying=--A wire opposed to the direction of lift, and used to prevent a
surface from collapsing upward during flight. [41] =Wire, Anti-lift or
Landing=--A wire opposed to the direction of gravity, and used to
sustain a surface when it is at rest. [42] =Wire, Drift=--A wire opposed
to the direction of drift, and used to prevent a surface from collapsing
backwards during flight. =Wire, Anti-drift=--A wire opposed to the
tension of a drift wire, and used to prevent such tension from distort