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165
The Aeroplane Speaks. Fifth Edition
·
H. Barber
75
4.
The
velocity
being
low,
then
it
follows
that
for
that
reason
also
the
angle
of
incidence
should
be
comparatively
large.
5.
Camber.--Since
such
an
aeroplane
would
be
of
low
velocity,
and
therefore
possess
a
large
angle
of
incidence,
a
large
camber
would
be
necessary.
Let
us
now
consider
the
essentials
for
an
aeroplane
of
maximum
velocity
for
its
power,
and
possessing
merely
enough
lift
to
get
off
the
ground,
but
no
margin
of
lift.
1.
Comparatively
high
velocity.
2.
A
comparatively
small
surface,
because,
being
of
greater
velocity
than
the
maximum
climber,
a
greater
mass
of
air
will
be
engaged
for
a
given
surface
and
time,
and
therefore
a
smaller
surface
will
be
sufficient
to
secure
the
requisite
lift.
3.
A
small
angle
relative
to
the
propeller
thrust,
since
the
latter
coincides
with
the
direction
of
motion.
4.
A
comparatively
small
angle
of
incidence
by
reason
of
the
high
velocity.
5.
A
comparatively
small
camber
follows
as
a
result
of
the
small
angle
of
incidence.
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