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165
The Aeroplane Speaks. Fifth Edition
·
H. Barber
148
=Roll,
to=--To
turn
about
the
longitudinal
axis.
=Rib,
Ordinary=--A
light
curved
wooden
part
mounted
in
a
fore
and
aft
direction
within
a
surface.
The
ordinary
ribs
give
the
surface
its
camber,
carry
the
fabric,
and
transfer
the
lift
from
the
fabric
to
the
spars.
[23]
=Rib,
Compression=--Acts
as
an
ordinary
rib,
besides
bearing
the
stress
of
compression
produced
by
the
tension
of
the
internal
bracing
wires.
[24]
=Rib,
False=--A
subsidiary
rib,
usually
used
to
improve
the
camber
of
the
front
part
of
the
surface.
[25]
=Right
and
Left
Hand=--Always
used
relative
to
the
position
of
the
pilot.
When
observing
an
aeroplane
from
the
front
of
it,
the
right
hand
side
of
it
is
then
on
the
left
hand
of
the
observer.
=Remou=--A
local
movement
or
condition
of
the
air
which
may
cause
displacement
of
an
aeroplane.
=Rudder-Bar=--A
control
lever
moved
by
the
pilot's
feet,
and
operating
the
rudder.
[26]
=Surface=--See
"Aerofoil."
=Surface,
Detrimental=--All
exterior
parts
of
an
aeroplane
including
the
propeller,
but
excluding
the
(aeroplane)
lifting
and
(propeller)
thrusting
surfaces.
=Surface,
Controlling=--A
surface
the
operation
of
which
turns
an
aeroplane
about
one
of
its
axes.
=Skin-Friction=--The
friction
of
the
air
with
roughness
of
surface.
A
form
of
drift.
=Span=--The
distance
from
wing-tip
to
wing-tip.
=Stagger=--The
distance
the
upper
surface
is
forward
of
the
lower
surface
when
the
axis
of
the
propeller
is
horizontal.
=Stability=--The
inherent
tendency
of
a
body,
when
disturbed,
to
return
to
its
normal
position.
=Stability,
Directional=--The
stability
about
an
axis
which
is
vertical
during
normal
horizontal
flight,
and
without
which
an
aeroplane
has
no
natural
tendency
to
remain
upon
its
course.
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