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165
The Aeroplane Speaks. Fifth Edition
·
H. Barber
114
In
the
case
of
aeroplanes
fitted
with
engines
of
the
rotary
type,
the
"flying
position"
is
some
special
attitude
laid
down
in
the
aeroplane's
specifications,
and
great
care
should
be
taken
to
secure
accuracy.
ANGLE
OF
INCIDENCE.--One
method
of
finding
the
angle
of
incidence
is
as
follows:
First
place
the
aeroplane
in
its
flying
position.
The
corner
of
the
straight-edge
must
be
placed
underneath
and
against
the
centre
of
the
rear
spar,
and
held
in
a
horizontal
position
parallel
to
the
ribs.
This
is
secured
by
using
a
spirit-level.
The
set
measurement
will
then
be
from
the
top
of
the
straight-edge
to
the
centre
of
the
bottom
surface
of
the
main
spar,
or
it
may
be
from
the
top
of
the
straight-edge
to
the
lowest
part
of
the
leading
edge.
Care
should
be
taken
to
measure
from
the
centre
of
the
spar
and
to
see
that
the
bubble
is
exactly
in
the
centre
of
the
level.
Remember
that
all
this
will
be
useless
if
the
aeroplane
has
not
been
placed
accurately
in
its
flying
position.
This
method
of
finding
the
angle
of
incidence
must
be
used
under
every
part
of
the
lower
surface
where
struts
occur.
It
should
not
be
used
between
the
struts,
because,
in
such
places,
the
spars
may
have
taken
a
slight
permanent
set
up
or
down;
not,
perhaps,
sufficiently
bad
to
make
any
material
difference
to
the
flying
of
the
machine,
but
quite
bad
enough
to
throw
out
the
angle
of
incidence,
which
cannot
be
corrected
at
such
a
place.
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