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165
The Aeroplane Speaks. Fifth Edition
·
H. Barber
150
=Spar,
Main=--A
spar
within
a
surface
and
to
which
all
the
ribs
are
attached,
such
spar
being
the
one
situated
nearest
to
the
centre
of
pressure.
It
transfers
more
than
half
the
lift
from
the
ribs
to
the
bracing.
[29]
=Spar,
Rear=--A
spar
within
a
surface,
and
to
which
all
the
ribs
are
attached,
such
spar
being
situated
at
the
rear
of
the
centre
of
pressure
and
at
a
greater
distance
from
it
than
is
the
main
spar.
It
transfers
less
than
half
of
the
lift
from
the
ribs
to
the
bracing.
[30]
=Strut=--Any
wooden
member
intended
to
take
merely
the
stress
of
direct
compression.
=Strut,
Interplane=--A
strut
holding
the
top
and
bottom
surfaces
apart.
[31]
=Strut,
Fuselage=--A
strut
holding
the
fuselage
longerons
apart.
It
should
be
stated
whether
top,
bottom,
or
side.
If
side,
then
it
should
be
stated
whether
right
or
left
hand.
Montant.
[32]
=Strut,
Extension=--A
strut
supporting
an
"extension"
when
not
in
flight.
It
may
also
prevent
the
extension
from
collapsing
upwards
during
flight.
[33]
=Strut,
undercarriage=--
[33a]
=Strut,
Dope=--A
strut
within
a
surface,
so
placed
as
to
prevent
the
tension
of
the
doped
fabric
from
distorting
the
framework.
[34]
=Serving=--To
bind
round
with
wire,
cord,
or
similar
material.
Usually
used
in
connection
with
wood
joints
and
wire
cable
splices.
=Slip,
Propeller=--The
pitch
less
the
distance
the
propeller
advances
during
one
revolution.
=Stream-Line=--A
form
or
shape
of
detrimental
surface
designed
to
produce
minimum
drift.
=Toss,
to=--To
plunge
tail-down.
=Torque,
Propeller=--The
tendency
of
a
propeller
to
turn
an
aeroplane
about
its
longitudinal
axis
in
a
direction
opposite
to
that
in
which
the
propeller
revolves.
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