Multiplex DG-600 - Page 15

The
servo
plate
16 is
die-stamped
to suit MULTIPLEX
nano
an
Micor
servos
(2
aileron
servos).
if
you
are using
different
servos,
adjust the
apertures
as required,
then
trim the
servo
plate
to fit
in
the fuselage.
It
you
intend
installing
an aero-tow
coupling,
it is vital
to use
a
powerful
servo,
producing
a torque
of more
than 2.0
cm / kg. lt is
mounted
inverted
on
the servo
plate
(next
to the fuselage
side)
In a commerctat
servo mount.
lf
the ailerons
and airbrakes
are to
operate
smoothly and
reliably
it is
essentialto
install
the
servo
plate
in exac
y
the right
posi_
tion. Fix
the servos
to
the
plate
(using quick
-
release
mounts),
and
position
the
plate
in
the fuselage.
Slip the aileron
and
ai;-
brake
pushrods
40 and
41 in
the outers,
leaving
the root
ends
qlgt_eclinS,
and
plug
the
wings into
the Iusetage.
snrfi the
servo
ptate
in
the fuselage
until the
pushrods
run
exactly
across
the
correct linkage
point
on the servos,outpul
arms. The
cables
should
be
pertec
y
straight
-
do not allow
any
bends or
curves at
all. Check
also
that the
servo
plate
is exacUv
horizontal
in the
fuselage.
Roughen
up the inside
oI the fuselage
where
the
plate
fits,
and
fix
it in
place
with
drops
of 5
-
minute
epoxy. When
the
glue
has
set, remove
the wings
and
servos
and
apply a fillet
of slöw
-sel
ling
epoxy
to secure
the
plate.
Rectractable
undercarriage
/fixed
wheel
ll
you
are fitting
a retractable
or fixed
wheel,
the axle
should
be
located
vertically
below
the wing teading
edge.
ptace
the fusel_
age
on a flal
surface
and rest
a setsquare
against
the wing
lead-
ing
edge at the
root. Now
sight
along
the square
onto the
ünder_
sroe ol rhe lusetage
and
make
a
pencil
mark
at
this
point.
The
wheel
position
is
not
crucial, and
this method
is
quite
accurate
enough.
The full
-
size
aircratt
has a
350 mm
diameter wheel.
which
corresponds
to a
diameter
ot about
65 mm
on the model.
Compression
strut
In an abrupt
landing,
the
wings
will tend
to swing forward
and
crush
the luselage
between
the leading
edges.
The
compression
strut 12
avoids
this
danger. lt is
instalted
bet-
ween
the leading
edges
in the
wing root
fairing,
and
can be re-
moved
at any
time.
Cut an
8 mm diameterhole
in
both root fairingswhere
marked.lt
is best
to drill the
hole
out to 7 mm
diameter
in
stages, and
then
to file it
out carefully
untilthe
strut is a
tight fit, otherwise
there
is
a
good
chance
that
you
will
lose
the strut.
Cut the
comoression
strut
to
length,
and check
that it ties
exac
y
flush
with the
out_
side
surlace
of the root fairings.
lt must
not
project
on
either
stoe.
Canopy
The
fit of
the canopy
is one
of the
crucial factors
in the
overall
impression
which
a model
aircraft
makes,
and forthis
reason
we
strongly
recommend
taking
particular
care at this
stage. Take
your
time
-
the
effort will
be worthwhile.
Place
the
cabin frame
6 on the
fuselage,
and
check that
the
fit
is
exactly right;
it
should
be 1 mm
smaller than
the cabin f
lange
atl
round.
Glue
the instrument
binnacle
on the frame,
trim
thö ins-
trument
panel
45 to tit,
and
glue
it in
ptace
also.
Tape
the frame
on the
fuselage,
and
drill the hole
for the
3
mm
diämeter
rivet
I through
the frame
and
the cabin flange.
Insert
the rivet
to check
for fit,
then remove
the
cabin trame
and
glue
the rivet into
the lrame.
The
canopy latch
7 is installed
next. Markthe
position
ofthe
slot
for the
actuating
pin
using
a felt
-tip
pen,
and file
the slot
out
neatly using
a small
needle tile,
after
drilling
a series
of
1.5
mm
pilot
holes. File
out the
hole in
the cRp fuselage
ftange
lor
the
bodyotthe
latch
to a diameter
of
5
mm.
Check that the tatch
fits.
and file
out the holes
if necessary.
Roughen
up the latch
bodi
and apply
a drop
of oil to the
pin
at
either end. The
latch is fixed
in
the fuselage
using
5
-
minute
epoxy.
When the
glue
has
set,
check
that the latch
still
works,
then apply
a fi
et oI slow-set-
ting epoxy,
prelerably
thickened
as
before,
to secure it
oerma-
nently.
Leave
the tusetage
inverted
while
the resin
cures.
Retract
the latch
pin
and
sand the front
face
of the tatch
bodv
f lush with
the
GRP fuselage
f lange.
Now
ptace
the
cabin fram;
on the fuselage,
position
it accurately,
and
press
the latch
pin
against
it. This will
leave
a tiny
dent, at which
point
you
should
carelully
drill a 3 mm
diameter
hole.
Check that
the cabin frame
seats accurately
on the fuselage.
Cut out the
canopy
5 along
the
marked
line.
The ideal
tool is
the
curved
scissors in
the MULTIPLEX
accessory range.
Trim
the
edge
ot the canopy
until it is
a
perfect
fit.
lf
you
wish
to
paint
the
cabin frame,
fit selfadhesive
instruments
and so
on. this is
vour
last
chance
to do so.
The following
section describes
the
method
oI obtaining
a
per-
fectly
fitted
canopy. Please
follow
the instructions
to
the
tetter
-
you
will
not
be disappointed.
To
avoid
soiling the fuselage,
apply
a coat
of release
agent wax
or
similar material
around
the cano-
py
Jlange.
lt can
easily be
polished
off again.when
the
job
is fi-
nished.
Position
the
canopy frame
on
the fuselage
and
hold it down firm-
ly by tying
thin
thread
(sewing
cotton) round
the fuselage;
don,t
worry,
the thread
can
easily be removed
again
later. The
ends of
the thread
can be
taped to
the underside
of
the fuselage
if
you
prefer.
Place
the canopy
overthe lrame
and
position
it aöcuräte-
ly.
Apply
a short
strip ot
coloured
taoe at
the front
and rear
across
the
canopy
and fuselage.
then
slit it along
the
joint
line.
The tape
provides
an accurale
means
of lining
üp
the canopy
later.
This
is very important,
as
you
will have litfle
chance to ad-
just
the
position
when
the
canopy is
glued
to the frame.
Clean
the canopy
and
cabin frame,
and apply
clear
contact
cement to
the
edge ol
the frame
only. lt is
essential
to work rapidly
here,
as
the
contact
glue
must not
be
allowed to
dry off in
the normal
way.
Note: Do
not apply
contact
cement
to the
canopy itself.
Place
the
canopy on
the frame, lining
up the strips
ot coloufpf,
tape. Fix
the
canopy in
place
with
strips
ot tape,
and carefi
,
wipe
excess
glue
onto
the tuselage
side. The
contact
cemenl
can now
be left
overnight
to harden.
This is not
the
usual me-
thod
ol using
this adhesive,
but it
is ideal for
our
purDose.
The
procedure
guarantees
a
perfect joint
between
canopy
and ca-
bin frame.
When
the
glue
has set
hard
(at
least
12 hours),
cut the cotton
thread
on the underside
of the fuselage
and
caretully
pull
it
through
and
underthe
canopy.
Carefully
prise
the
canoöyaway
lrom
the fuselage.
Press
the canopy
moulding
onto tfie
cabin
frame
all
round. Peel
off the
marker
tapes,
cheCk the
canopy for
fit, and
carry
out any final
trimming
required.
The canopy
latch
actuating
pin
can now
be cut down
carefullyto
a minimum
length,
so that it is
less
consDicuous.
Aero
-
tow
coupling
A
simple and
reliable
aero
-
tow coupling
can be installed
as fol-
lows:
file out
a vertical
slot 2 x
5
mm
in the right
-
hand fuselage
side
as
lar
forward
as
possible.
Pilot
-
drill the hote
lirst,
and
file
out to
shape.
Bend the
2 mm internal
diameter
plastic
guide
tube
43 to match
the curvature
ofthe fuselage,
and cut it
to correct length.
Solde<
a
clevis 39 to
the end
of the I mm
diameter
steel rod
58. slio t
rod into
the tube.
and
connect the
clevis to the
servo oütput'
arm.
When
the
servo output
arm is at neutral,
the
end of the
steel rod
should
be
visible
in
the slot.
Cut the steel rod
to length,
and de-
burr the
cut end.
Note: Use
a
powerful
servo,
producing
at least
2.0 cm /
kg of tor-
que,
and
connect the
steel rod
as close
to the
output shaft
centre as
oossible.
Roughen
up the
guide
tube 43
and the fuselage
side, and epoxy
the tube in
place,
with
the rod
pointing
directty
at the
servo out-
put
arm. lt may
be necessary
to support
the
guide
tube with
a
length
ol wood
while
the
glue
is
setting.
Check that
the system
works
reliably.
Rudder
First
check that the rudder
has
ample freedom
of movement
at
the
top: it will
be necessary
to file
out the rear
section of
the tail-
plane
mount
as
shown in
the drawing.
Cut the leading
edge
strip 22 to length,
glue
it to
the front face
of
the rudder,
and
sand the
edges flush.
Mark
a centreline
on the lront
tace
ot
part
22 from
top to bottom,
and
glue
the hinge
tube 43
exactly along
this line. lt is
best to in-
sert the
pivot
rod 44 in
the tube tirst.
Glue the in{ill
strips 46
on either
side ol the
oivot
tube. and
sand
their
edges flush.
Glue the
other half
of strip 22 on
the front tace
of the rudder,
and
sand flush
all
round.