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165
The Aeroplane Speaks. Fifth Edition
·
H. Barber
145
=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.
[17]
=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.
[18]
=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.
=Multiplane=--An
aeroplane
of
which
the
main
lifting
surface
consists
of
numerous
surfaces
or
pairs
of
wings
mounted
one
above
the
other.
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