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BEFORE TAKE
-
OFF.
WARM-UP
.
Mos
t
of the
warm-up will
have been
conducted
during taxi, and
addi-
ti
onal
warm-up before take-ofi shou ld be restricted to the
checks
out-
lined
i
n Section
I.
Since t he
engine
is closely cowled for
efficient in-flight
cooling,
precautions
should be taken to
avoid overheating on
the
ground.
MAGNETO CHECK.
The
magneto
check should
be made at
1700 RPM
as follows
:
Move
the
ignition
switch
first
to "R"
position and
note
RPM.
Then move switch
back to "BOTH" position to
clear
the
other set of plugs
.
Then move
switch to
"L"
position
and
note RPM.
The
difference between
the two
magnetos
oper
ated
individually should not be
more
than 75 RPM.
If
there
is
a
doubt
concerning the operation
of
the
ignition
system,
RPM
checks at
higher
engine
speeds
will
usually
confirm whether a
defici
ency
exists.
An
abs
ence of
RPM drop may
be an
indication of
faulty
grounding of
one side of the
ignition system or should be cause
for
suspicion that the
magneto timing is
set
in
advance
of
the
setting
specified.
TAKE-OFF.
POWER CHECKS
.
It
is
important
to check full-throttle engine operation
early
in
lhe take
-
off run.
Any signs
of
rough
engine operation
or
s
l
uggish
e ngine
accelera-
tion
is
good cause
for
discontinuing
the
take-
off.
If
this occurs,
you are
justified
in
making a
thorough
full-throttle,
static
runup before
another
take-off
is
attempted. The
engine should
run
smoothl
y and turn a pproxi
-
mately 2500
to
2600 RPM with
carburetor
heat off.
Full
throttle
runups over
loose gravel are especially
harmful to pro-
pelle
r
tips. When take-offs must
be made over a
gravel
surface, it
is
very important that
the
throttle be
advanced slowly.
This allows the
air-
plane
to s
tart
rolling before high RPM is
developed, and the gravel will
be
blow
n
back
of
the propeller
rather
than pulled into
it. When
unavoid-
2-8
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