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165
The Aeroplane Speaks. Fifth Edition
·
H. Barber
138
GLOSSARY
The
numbers
at
the
right-hand
side
of
the
page
indicate
the
parts
numbered
in
the
preceding
diagrams.
=Aeronautics=--The
science
of
aerial
navigation.
=Aerofoil=--A
rigid
structure,
of
large
superficial
area
relative
to
its
thickness,
designed
to
obtain,
when
driven
through
the
air
at
an
angle
inclined
to
the
direction
of
motion,
a
reaction
from
the
air
approximately
at
right
angles
to
its
surface.
Always
cambered
when
intended
to
secure
a
reaction
in
one
direction
only.
As
the
term
"aerofoil"
is
hardly
ever
used
in
practical
aeronautics,
I
have,
throughout
this
book,
used
the
term
SURFACE,
which,
while
academically
incorrect,
since
it
does
not
indicate
thickness,
is
the
term
usually
used
to
describe
the
cambered
lifting
surfaces,
i.e.,
the
"planes"
or
"wings,"
and
the
stabilizers
and
the
controlling
aerofoils.
=Aerodrome=--The
name
usually
applied
to
a
ground
used
for
the
practice
of
aviation.
It
really
means
"flying
machine,"
but
is
never
used
in
that
sense
nowadays.
=Aeroplane=--A
power-driven
aerofoil
fitted
with
stabilizing
and
controlling
surfaces.
=Acceleration=--The
rate
of
change
of
velocity.
=Angle
of
Incidence=--The
angle
at
which
the
"neutral
lift
line"
of
a
surface
attacks
the
air.
=Angle
of
Incidence,
Rigger's=--The
angle
the
chord
of
a
surface
makes
with
a
line
parallel
to
the
axis
of
the
propeller.
=Angle
of
Incidence,
Maximum=--The
greatest
angle
of
incidence
at
which,
for
a
given
power,
surface
(including
detrimental
surface),
and
weight,
horizontal
flight
can
be
maintained.
=Angle
of
Incidence,
Minimum=--The
smallest
angle
of
incidence
at
which,
for
a
given
power,
surface
(including
detrimental
surface),
and
weight,
horizontal
flight
can
be
maintained.
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