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165
The Aeroplane Speaks. Fifth Edition
·
H. Barber
151
=Tail-Slide=--A
fall
whereby
the
tail
of
an
aeroplane
leads.
=Tractor=--An
aeroplane
of
which
the
propeller
is
mounted
in
front
of
the
main
lifting
surface.
=Triplane=--An
aeroplane
of
which
the
main
lifting
surface
consists
of
three
surfaces
or
pairs
of
wings
mounted
one
above
the
other.
=Tail-Plane=--A
horizontal
stabilizing
surface
mounted
at
some
distance
behind
the
main
lifting
surface.
Empennage.
[36]
=Turnbuckle=--A
form
of
wire-tightener,
consisting
of
a
barrel
into
each
end
of
which
is
screwed
an
eyebolt.
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.
[37a]
=Warp,
to=--To
distort
a
surface
in
order
to
vary
its
angle
of
incidence.
To
vary
the
angle
of
incidence
of
a
controlling
surface.
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