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165
The Aeroplane Speaks. Fifth Edition
·
H. Barber
97
If
an
upside-down
flight
is
desired,
the
engine
may,
or
may
not,
be
throttled
down
at
point
A.
If
not
throttled
down,
then
the
elevator
must
be
operated
to
secure
a
course
approximately
in
the
direction
B.
If
it
is
throttled
down,
then
the
course
must
be
one
of
a
steeper
angle
than
B,
or
there
will
be
danger
of
stalling.
[Footnote
16:
"In
effect"
because,
although
there
may
be
actually
the
greatest
proportion
of
keel-surface
in
front
of
the
vertical
axis,
such
surface
may
be
much
nearer
to
the
axis
than
is
the
keel-surface
towards
the
tail.
The
latter
may
then
be
actually
less
than
the
surface
in
front,
but,
being
farther
from
the
axis,
it
has
a
greater
leverage,
and
consequently
is
greater
in
effect
than
the
surface
in
front.]
[Footnote
17:
The
reason
the
C.P.
of
an
inclined
surface
is
forward
of
the
centre
of
the
surface
is
because
the
front
of
the
surface
does
most
of
the
work,
as
explained
on
p.
62.]
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