39
Center
of
Gravity
The
C.A.T.
module
is
factory
‐
installed
in
the
nose
of
the
body
to
keep
it
as
far
away
from
the
3
‐
in
‐
1
control
unit
as
possible
(in
order
to
ensure
the
best
possible
interference
‐
free
performance).
As
a
result
the
Evolve
300
CX
will
typically
be
slightly
nose
‐
heavy
when
checking
the
center
of
gravity
(CG)
relative
to
the
inner/outer
main
shafts.
This
is
not
usually
a
problem
when
flying
indoors
because
after
adding
a
small
amount
of
backward/up
elevator
trim
the
helicopter
will
hover
level
without
drifting
forward
due
to
the
slightly
nose
‐
heavy
CG.
However
when
flying
outdoors,
especially
in
any
wind,
it
is
typically
best
to
ensure
that
the
CG
of
helicopter
is
set
so
it’s
as
‘neutral’
(not
nose
‐
heavy
and
not
tail
‐
heavy)
as
possible.
Otherwise
you
may
find
that
it’s
more
difficult
to
change
direction
quickly
and
that
the
helicopter
may
not
always
maintain
adequate
stability
causing
it
to
pitch
or
bank
to
an
angle
that
cannot
be
recovered
from
before
resulting
in
a
crash.
To
check
the
CG
install
the
LiPo
flight
battery
in
the
helicopter
then
rotate
the
stabilizer
flybar
until
it’s
positioned
perpendicular
to
the
tail
boom
of
the
body.
Lift
the
helicopter
by
the
flybar
and
check
to
see
if
the
landing
skids/body
are
‘level’
relative
to
the
ground/horizon.
If
they
are
not
‘level’
the
easiest
way
to
adjust
the
CG
is
to
add
some
weight
to
the
tail
of
the
body
as
needed.
We
recommend
using
the
adhesive
‐
backed
lead
weights
available
from
most
hobby
stores.
Typically
only
about
1/4
ounce
(7
grams)
of
weight
will
need
to
be
added
to
the
tail
in
order
to
achieve
the
best
possible
and
‘neutral’
CG.
You
can
apply
the
weight(s)
to
the
outside
of
the
bottom
section
of
the
vertical
fin/tail
or
possibly
even
inside
the
fin/tail
if
you
prefer
(after
cutting
a
small
opening
near
the
trailing
edge
to
gain
access).
Also,
it’s
very
important
to
ensure
the
weight
is
attached
to
the
body
very
securely
so
it
cannot
fall
off
during
flight,
handling
or
storage.
And
although
adding
a
relatively
minimal
amount
of
extra
weight
to
the
helicopter
to
achieve
the
best
possible
CG
will
have
little
to
no
discernible
impact
on
overall
flight
performance
for
most
pilots,
if
you
prefer
to
not
add
weight
to
the
tail
you
can
also
consider
removing
the
C.A.T.
module
(and
the
ultrasonic
sensors/mounts)
from
the
helicopter/nose
of
the
body
completely
(however
we
do
not
typically
recommend
doing
so,
especially
if
you
ever
plan
to
fly
indoors
where
C.A.T.
can
help
to
prevent
collisions
with
a
variety
of
obstacles).
Hints
and
Tips
When
flying
outdoors
in
a
suitable
area
that’s
large
enough
and
free
of
people
and
obstructions
we
recommend
using
the
switch
on
the
transmitter
to
turn
C.A.T.
off.
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