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165
The Aeroplane Speaks. Fifth Edition
·
H. Barber
22
"Yes,"
said
the
Dihedral
Angle,
"that's
what
would
happen
if
they
would
only
make
me
large
enough;
but
they
won't
do
it
because
it
would
too
greatly
decrease
the
total
horizontal
equivalent,
and
therefore
the
Lift,
and
incidentally
it
would,
as
Aeroplanes
are
built
to-day,
produce
an
excess
of
Keel
Surface
above
the
turning
axis,
and
that
in
itself
would
spoil
the
Lateral
Stability.
The
Keel
Surface
should
be
equally
divided
above
and
below
the
longitudinal
turning
axis
(upon
which
the
Aeroplane
rolls
sideways),
or
the
side
upon
which
there
is
an
excess
will
get
blown
over
by
the
gusts.
It
strikes
me
that
my
future
isn't
very
promising,
and
about
my
only
chance
is
when
the
Junior
Draughtsman
makes
a
mistake,
as
he
did
the
other
day.
And
just
think
of
it,
they
call
him
a
Designer
now
that
he's
got
a
job
at
the
Factory!
What
did
he
do?
Why,
he
calculated
the
weights
wrong
and
got
the
Centre
of
Gravity
too
high,
and
they
didn't
discover
it
until
the
machine
was
built.
Then
all
they
could
do
was
to
give
me
a
larger
Angle.
That
dropped
the
bottom
of
the
=V=
lower
down,
and
as
that's
the
centre
of
the
machine,
where
all
the
Weight
is,
of
course
that
put
the
Centre
of
Gravity
in
its
right
place.
But
now
there
is
too
much
Keel
Surface
above,
and
the
whole
thing's
a
Bad
Compromise,
not
at
all
like
Our
Efficiency."
And
Efficiency,
blushing
very
prettily
at
the
compliment,
then
asked,
"And
how
does
the
Centre
of
Gravity
affect
matters?"
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