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165
The Aeroplane Speaks. Fifth Edition
·
H. Barber
27
"Well,
I
hope
that's
all
as
it
should
be,"
she
concluded,
"for
to-morrow
the
Great
Test
in
the
air
is
due."
[Footnote
4:
Morane
parasol:
A
type
of
Morane
monoplane
in
which
the
lifting
surfaces
are
raised
above
the
pilot
in
order
to
afford
him
a
good
view
of
the
earth.]
[Footnote
5:
Skin
friction
is
that
part
of
the
drift
due
to
the
friction
of
the
air
with
roughness
upon
the
surface
of
the
aeroplane.]
[Footnote
6:
Banking:
When
an
aeroplane
is
turned
to
the
left
or
the
right
the
centrifugal
force
of
its
momentum
causes
it
to
skid
sideways
and
outwards
away
from
the
centre
of
the
turn.
To
minimize
such
action
the
pilot
banks,
i.e.,
tilts,
the
aeroplane
sideways
in
order
to
oppose
the
underside
of
the
planes
to
the
air.
The
aeroplane
will
not
then
skid
outwards
beyond
the
slight
skid
necessary
to
secure
a
sufficient
pressure
of
air
to
balance
the
centrifugal
force.]
[Footnote
7:
An
explanation
of
the
way
in
which
the
wash-out
is
combined
with
a
wash-in
to
offset
propeller
torque
will
be
found
on
p.
82.]
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