Lab
Library
Journal
Shop
Sign in
to keep
Share image
1
165
The Aeroplane Speaks. Fifth Edition
·
H. Barber
144
=Gravity,
Specific=--
Density
of
substance
--------------------
Density
of
water.
Thus,
if
the
density
of
water
is
10
lb.
per
unit
volume,
the
same
unit
volume
of
petrol,
if
weighing
7
lb.,
would
be
said
to
have
a
specific
gravity
of
7/10,
i.e.,
0.7.
=Gap=
(of
an
aeroplane)--The
distance
between
the
upper
and
lower
surfaces
of
a
biplane.
In
a
triplane
or
multiplane,
the
distance
between
any
two
of
its
surfaces.
[16]
=Gap,
Propeller=--The
distance,
measured
in
the
direction
of
the
thrust,
between
the
spiral
courses
of
the
blades.
=Girder=--A
structure
designed
to
resist
bending,
and
to
combine
lightness
and
strength.
=Gyroscope=--A
heavy
circular
wheel
revolving
at
high
speed,
the
effect
of
which
is
a
tendency
to
maintain
its
plane
of
rotation
against
disturbing
forces.
=Hangar=--An
aeroplane
shed.
=Head-resistance=--Drift.
The
resistance
of
the
air
to
the
passage
of
a
body.
=Helicopter=--An
air-screw
revolving
about
a
vertical
axis,
the
direction
of
its
thrust
being
opposed
to
gravity.
=Horizontal
Equivalent=--The
plan
view
of
a
body
whatever
its
attitude
may
be.
=Impulse=--A
force
causing
a
body
to
gain
or
lose
momentum.
=Inclinometer=--A
curved
form
of
spirit-level
used
for
indicating
the
attitude
of
a
body
relative
to
the
horizontal.
=Instability=--An
inherent
tendency
of
a
body,
which,
if
the
body
is
disturbed,
causes
it
to
move
into
a
position
as
far
as
possible
away
from
its
first
position.
=Instability,
Neutral=--An
inherent
tendency
of
a
body
to
remain
in
the
position
given
it
by
the
force
of
a
disturbance,
with
no
tendency
to
move
farther
or
to
return
to
its
first
position.
Marker
Marker
Fine marker
White-out
Fine white-out
Circle
Paint
Unmarker
Hand
Scalpel
Dice
Sieve
Purify
Undo
Redo
Start over
