Lab
Library
Journal
Shop
Sign in
to keep
Share image
1
165
The Aeroplane Speaks. Fifth Edition
·
H. Barber
122
1.
The
angle
of
incidence
may
be
wrong.
If
it
is
too
great,
it
will
produce
more
lift
than
on
the
other
side
of
the
aeroplane;
and
if
too
small,
it
will
produce
less
lift
than
on
the
other
side--the
result
being
that,
in
either
case,
the
aeroplane
will
try
to
fly
one
wing
down.
2.
Distorted
Surfaces.--If
some
part
of
the
surface
is
distorted,
then
its
camber
is
spoiled,
and
the
lift
will
not
be
the
same
on
both
sides
of
the
aeroplane,
and
that,
of
course,
will
cause
it
to
fly
one
wing
down.
Longitudinal
Instability
may
be
due
to
the
following
reasons:
1.
The
stagger
may
be
wrong.
The
top
surface
may
have
drifted
back
a
little
owing
to
some
of
the
wires,
probably
the
incidence
wires,
having
elongated
their
loops
or
having
pulled
the
fittings
into
the
wood.
If
the
top
surface
is
not
staggered
forward
to
the
correct
degree,
then
consequently
the
whole
of
its
lift
is
too
far
back,
and
it
will
then
have
a
tendency
to
lift
up
the
tail
of
the
machine
too
much.
The
aeroplane
would
then
be
said
to
be
"nose-heavy."
A
1/4-inch
area
in
the
stagger
will
make
a
very
considerable
difference
to
the
longitudinal
stability.
2.
If
the
angle
of
incidence
of
the
main
surface
is
not
right,
it
will
have
a
bad
effect,
especially
in
the
case
of
an
aeroplane
with
a
lifting
tail-plane.
If
the
angle
is
too
great,
it
will
produce
an
excess
of
lift,
and
that
may
lift
up
the
nose
of
the
aeroplane
and
result
in
a
tendency
to
fly
"tail-down."
If
the
angle
is
too
small,
it
will
produce
a
decreased
lift,
and
the
aeroplane
may
have
a
tendency
to
fly
"nose-down."
Marker
Marker
Fine marker
White-out
Fine white-out
Circle
Paint
Unmarker
Hand
Scalpel
Dice
Sieve
Purify
Undo
Redo
Start over
