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165
The Aeroplane Speaks. Fifth Edition
·
H. Barber
142
=Displacement=--Change
of
position.
=Drift=
(of
an
aeroplane
as
distinct
from
the
propeller)--The
horizontal
component
of
the
reaction
produced
by
the
action
of
driving
through
the
air
a
surface
inclined
upwards
and
towards
its
direction
of
motion
plus
the
horizontal
component
of
the
reaction
produced
by
the
"detrimental"
surface
plus
resistance
due
to
"skin-friction."
Sometimes
termed
"head-resistance."
=Drift,
Active=--Drift
produced
by
the
lifting
surface.
=Drift,
Passive=--Drift
produced
by
the
detrimental
surface.
=Drift=
(of
a
propeller)--Analogous
to
the
drift
of
an
aeroplane.
It
is
convenient
to
include
"eddies"
and
"cavitation"
within
this
term.
=Drift,
to=--To
be
carried
by
a
current
of
air;
to
make
leeway.
=Dive,
to=--To
descend
so
steeply
as
to
produce
a
speed
greater
than
the
normal
flying
speed.
=Dope,
to=--To
paint
a
fabric
with
a
special
fluid
for
the
purpose
of
tightening
and
protecting
it.
=Density=--Mass
of
unit
volume;
for
instance,
pounds
per
cubic
foot.
=Efficiency=--
Output
------
Input.
=Efficiency=
(of
an
aeroplane
as
distinct
from
engine
and
propeller)--
Lift
and
Velocity
---------------------------
Thrust
(=
aeroplane
drift).
=Efficiency,
Engine=--
Brake
horse-power
----------------------
Indicated
horse-power.
=Efficiency,
Propeller=--
Thrust
horse-power
--------------------------------
Horse-power
received
from
engine
(=
propeller
drift).
NOTE.--The
above
terms
can,
of
course,
be
expressed
in
foot-pounds.
It
is
then
only
necessary
to
divide
the
upper
term
by
the
lower
one
to
find
the
measure
of
efficiency.
=Elevator=--A
controlling
surface,
usually
hinged
to
the
rear
of
the
tail-plane,
the
operation
of
which
turns
an
aeroplane
about
an
axis
which
is
transverse
to
the
direction
of
normal
horizontal
flight.
[8]
=Empennage=--See
"Tail-plane."
Marker
Marker
Fine marker
White-out
Fine white-out
Circle
Paint
Unmarker
Hand
Scalpel
Dice
Sieve
Purify
Undo
Redo
Start over
