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165
The Aeroplane Speaks. Fifth Edition
·
H. Barber
78
SUMMARY.
Essentials
for
Maximum
Climb.
1.
Low
velocity.
2.
Large
surface.
3.
Large
angle
relative
to
propeller
thrust.
4.
Large
angle
relative
to
direction
of
motion.
5.
Large
camber.
Essentials
for
Maximum
Velocity.
1.
High
velocity.
2.
Small
surface.
3.
Small
angle
relative
to
propeller
thrust.
4.
Small
angle
relative
to
direction
of
motion.
5.
Small
camber.
It
is
mechanically
impossible
to
construct
an
aeroplane
of
reasonable
weight
of
which
it
would
be
possible
to
vary
the
above
opposing
essentials.
Therefore,
all
aeroplanes
are
designed
as
a
compromise
between
Climb
and
Velocity.
As
a
rule
aeroplanes
are
designed
to
have
at
low
altitude
a
slight
margin
of
lift
when
the
propeller
thrust
is
horizontal.
By
this
means,
when
the
altitude
is
reached
where
the
margin
of
lift
disappears
(on
account
of
loss
of
engine
power),
and
which
is,
consequently,
the
altitude
where
it
is
just
possible
to
maintain
horizontal
flight,
the
aeroplane
is
flying
with
its
thrust
horizontal
and
with
maximum
efficiency
(as
distinct
from
engine
and
propeller
efficiency).
The
margin
of
lift
at
low
altitude,
and
when
the
thrust
is
horizontal,
should
then
be
such
that
the
higher
altitude
at
which
the
margin
of
lift
is
lost
is
that
altitude
at
which
most
of
the
aeroplane's
horizontal
flight
work
is
done.
That
ensures
maximum
velocity
when
most
required.
Unfortunately,
where
aeroplanes
designed
for
fighting
are
concerned,
the
altitude
where
most
of
the
work
is
done
is
that
at
which
both
maximum
velocity
and
maximum
margin
of
lift
for
power
are
required.
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