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165
The Aeroplane Speaks. Fifth Edition
·
H. Barber
76
MINIMUM
ANGLE.
This
gives
the
greatest
velocity
during
horizontal
flight
at
a
low
altitude.
Greater
velocity
would
be
secured
if
the
surface,
angle,
and
camber
were
smaller
and
designed
to
just
maintain
horizontal
flight
with
a
horizontal
thrust.
Also,
in
such
case,
the
propeller
would
not
be
thrusting
downwards,
but
along
a
horizontal
line
which
is
obviously
a
more
efficient
arrangement
if
we
regard
the
aeroplane
merely
from
one
point
of
view,
i.e.,
either
with
reference
to
velocity
or
climb.
OPTIMUM
ANGLE.
(Thrust
horizontal).
The
velocity
is
less
than
at
the
smaller
minimum
angle,
and,
as
aeroplanes
are
designed
to-day,
the
area
and
angle
of
incidence
of
the
surface
is
such
as
to
secure
a
slight
ascent
at
a
low
altitude.
The
camber
of
the
surface
is
designed
for
this
angle
of
incidence
and
velocity.
The
lift-drift
ratio
is
best
at
this
angle.
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