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165
The Aeroplane Speaks. Fifth Edition
·
H. Barber
42
"Well,
what
result?"
calls
the
Flight-Commander
to
the
Pilot.
"A
hundred
miles
an
hour
and
a
thousand
feet
a
minute,"
he
briefly
replies.
"And
a
very
good
result
too,"
says
the
Aeroplane,
complacently,
as
he
is
carefully
wheeled
into
his
shed.
That
is
the
way
Aeroplanes
speak
to
those
who
love
them
and
understand
them.
Lots
of
Pilots
know
all
about
it,
and
can
spin
you
wonderful
yarns,
much
better
than
this
one,
if
you
catch
them
in
a
confidential
mood--on
leave,
for
instance,
and
after
a
good
dinner.
[Footnote
8:
A.M.'s:
Air
Mechanics.]
[Footnote
9:
Butt
means
to
thicken
at
the
end.
Screw
means
to
machine
a
thread
on
the
butt-end
of
the
wire,
and
in
this
way
the
wire
can
make
connection
with
the
desired
place
by
being
screwed
into
a
metal
fitting,
thus
eliminating
the
disadvantage
of
the
unsatisfactory
loop.]
[Footnote
10:
Deviation
Curve:
A
curved
line
indicating
any
errors
in
the
compass.]
[Footnote
11:
A
propeller
screws
through
the
air,
and
the
distance
it
advances
during
one
revolution,
supposing
the
air
to
be
solid,
is
known
as
the
pitch.
The
pitch,
which
depends
upon
the
angle
of
the
propeller
blades,
must
be
equal
to
the
speed
of
the
aeroplane,
plus
the
slip,
and
if,
on
account
of
the
rarity
of
the
air,
the
speed
of
the
aeroplane
increases,
then
the
angle
and
pitch
should
be
correspondingly
increased.
Propellers
with
a
pitch
capable
of
being
varied
by
the
pilot
are
the
dream
of
propeller
designers.
For
explanation
of
"slip"
see
Chapter
IV.
on
propellers.]
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