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165
The Aeroplane Speaks. Fifth Edition
·
H. Barber
140
=Air
Pocket=--A
local
movement
or
condition
of
the
air
causing
an
aeroplane
to
drop
or
lose
its
correct
attitude.
=Aspect-Ratio=--The
proportion
of
span
to
chord
of
a
surface.
=Air-Screw
(Propeller)=--A
surface
so
shaped
that
its
rotation
about
an
axis
produces
a
force
(thrust)
in
the
direction
of
its
axis.
[2]
=Aileron=--A
controlling
surface,
usually
situated
at
the
wing-tip,
the
operation
of
which
turns
an
aeroplane
about
its
longitudinal
axis;
causes
an
aeroplane
to
tilt
sideways.
[3]
=Aviation=--The
art
of
driving
an
aeroplane.
=Aviator=--The
driver
of
an
aeroplane.
=Barograph=--A
recording
barometer,
the
charts
of
which
can
be
calibrated
for
showing
air
density
or
height.
=Barometer=--An
instrument
used
for
indicating
the
density
of
air.
=Bank,
to=--To
turn
an
aeroplane
about
its
longitudinal
axis
(to
tilt
sideways)
when
turning
to
left
or
right.
=Biplane=--An
aeroplane
of
which
the
main
lifting
surface
consists
of
a
surface
or
pair
of
wings
mounted
above
another
surface
or
pair
of
wings.
=Bay=--The
space
enclosed
by
two
struts
and
whatever
they
are
fixed
to.
=Boom=--A
term
usually
applied
to
the
long
spars
joining
the
tail
of
a
"pusher"
aeroplane
to
its
main
lifting
surface.
[4]
=Bracing=--A
system
of
struts
and
tie
wires
to
transfer
a
force
from
one
point
to
another.
=Canard=--Literally
"duck."
The
name
which
was
given
to
a
type
of
aeroplane
of
which
the
longitudinal
stabilizing
surface
(empennage)
was
mounted
in
front
of
the
main
lifting
surface.
Sometimes
termed
"tail-first"
aeroplanes,
but
such
term
is
erroneous,
as
in
such
a
design
the
main
lifting
surface
acts
as,
and
is,
the
empennage.
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