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165
The Aeroplane Speaks. Fifth Edition
·
H. Barber
139
=Angle
of
Incidence,
Best
Climbing=--That
angle
of
incidence
at
which
an
aeroplane
ascends
quickest.
An
angle
approximately
halfway
between
the
maximum
and
optimum
angles.
=Angle
of
Incidence,
Optimum=--The
angle
of
incidence
at
which
the
lift-drift
ratio
is
the
highest.
=Angle,
Gliding=--The
angle
between
the
horizontal
and
the
path
along
which
an
aeroplane,
at
normal
flying
speed,
but
not
under
engine
power,
descends
in
still
air.
=Angle,
Dihedral=--The
angle
between
two
planes.
=Angle,
Lateral
Dihedral=--The
lifting
surface
of
an
aeroplane
is
said
to
be
at
a
lateral
dihedral
angle
when
it
is
inclined
upward
towards
its
wing-tips.
=Angle,
Longitudinal
Dihedral=--The
main
surface
and
tail
surface
are
said
to
be
at
a
longitudinal
dihedral
angle
when
the
projections
of
their
neutral
lift
lines
meet
and
produce
an
angle
above
them.
=Angle,
Rigger's
Longitudinal
Dihedral=--Ditto,
but
substituting
"chords"
for
"neutral
lift
lines."
=Angle,
Pitch=--The
angle
at
any
given
point
of
a
propeller,
at
which
the
blade
is
inclined
to
the
direction
of
motion
when
the
propeller
is
revolving
but
the
aeroplane
stationary.
=Altimeter=--An
instrument
used
for
measuring
height.
=Air-Speed
Indicator=--An
instrument
used
for
measuring
air
pressures
or
velocities.
It
consequently
indicates
whether
the
surface
is
securing
the
requisite
reaction
for
flight.
Usually
calibrated
in
miles
per
hour,
in
which
case
it
indicates
the
correct
number
of
miles
per
hour
at
only
one
altitude.
This
is
owing
to
the
density
of
the
air
decreasing
with
increase
of
altitude
and
necessitating
a
greater
speed
through
space
to
secure
the
same
air
pressure
as
would
be
secured
by
less
speed
at
a
lower
altitude.
It
would
be
more
correct
to
calibrate
it
in
units
of
air
pressure.
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