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165
The Aeroplane Speaks. Fifth Edition
·
H. Barber
146
=Montant=--Fuselage
strut.
=Nacelle=--That
part
of
an
aeroplane
containing
the
engine
and/or
pilot
and
passenger,
and
to
which
the
tail-plane
is
not
fixed.
[19]
=Neutral
Lift
Line=--A
line
taken
through
a
surface
in
a
forward
direction
relative
to
its
direction
of
motion,
and
starting
from
its
trailing
edge.
If
the
attitude
of
the
surface
is
such
as
to
make
the
said
line
coincident
with
the
direction
of
motion,
it
results
in
no
lift,
the
reaction
then
consisting
solely
of
drift.
The
position
of
the
neutral
lift
line,
i.e.,
the
angle
it
makes
with
the
chord,
varies
with
differences
of
camber,
and
it
is
found
by
means
of
wind-tunnel
research.
=Newton's
Laws
of
Motion=--1.
If
a
body
be
at
rest,
it
will
remain
at
rest;
or,
if
in
motion,
it
will
move
uniformly
in
a
straight
line
until
acted
upon
by
some
force.
2.
The
rate
of
change
of
the
quantity
of
motion
(momentum)
is
proportional
to
the
force
which
causes
it,
and
takes
place
in
the
direction
of
the
straight
line
in
which
the
force
acts.
If
a
body
be
acted
upon
by
several
forces,
it
will
obey
each
as
though
the
others
did
not
exist,
and
this
whether
the
body
be
at
rest
or
in
motion.
3.
To
every
action
there
is
opposed
an
equal
and
opposite
reaction.
=Ornithopter
(or
Orthopter)=--A
flapping
wing
design
of
aircraft
intended
to
imitate
the
flight
of
a
bird.
=Outrigger=--This
term
is
usually
applied
to
the
framework
connecting
the
main
surface
with
an
elevator
placed
in
advance
of
it.
Sometimes
applied
to
the
"tail-boom"
framework
connecting
the
tail-plane
with
the
main
lifting
surface.
[20]
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