Multiplex DG-600 Bauanleitung Seite 19

lI you now lold the aileron up and down a number of times, the
two strips of tape will bond in the centre, to produce a perfect
tape hinge. The basic requirement for this form of hinge is that
the trailing edge ot the wing and the leading edge of the aileron
were left with a straight, sharp edge, as described in the building
instructions.
Connect the threaded pushrod to the aileron horn and check
the aileron movement. Apply a small blob oI s-minute epoxy to
the end ot the pushrod to secure it. Repeat the procedure with
the second aileron and the elevator.
Installing the radio control equipment
The guide tubes already in place in the fuselage usually have to
be shortened in the cabin area. They can be cut through with a
sharo knile.
Install the servos in the Iuselage. Fit the clevises 39 about half-
way onto the threaded portion of the threaded couplers 38, and
connect the links to the servo outout discs.
Set the control surfaces and servos to neutral, and the airbrakes
to fully closed. Mark the correct length of the linkage rods for
the control surfaces (the shoulder ol the threaded coupler) us-
ing a telt -tip pen, cut the rods to length and de - burr the cut
e n o s .
Roughen up the steel rods, bend the ends into a gentle "S"
shape, and solder them into the threaded couplers.
Check that the bowden cables are as straight as possible, and
give them extra support by gluing them to the fuselage side at
several points with epoxy. Glue pieces oI scrap wood (the re-
mainder of strip 47) under the ends of the bowden cable outers.
Check that the control surface neutral oositions and throws are
correct, and check that all systems work freely. Check also that
the control"sense" is correct, i.e. moving the rudder stick to the
right results in the rudder moving to lhe right. The airbrake and
aileron linkages are completed in the same manner. Here again,
check control surface movements and sense.
Check that all control surfaces, and in particular the airbrakes,
are able to move to the servos' extremes of travel without being
mechanically obstructed at any point. A stalled servo consumes
a very high current, and thus depletes the receiver battery in a
very short time.
Fit the receiver battery into the fuselage nose and pack round it
with foam rubber. The receiver battery should h ave a capacity of
at least 1200 mAh. Hook - and - loop tape (Velcro) is ideally suit-
ed to fixing batteries.
The receiver is fixed to the luselage side using the same mate-
rial.
The receiver aerial can be deployed inside the fuselage by slip-
ping it inside a length of plastic tubing (bowden cable outer),
which is left loose in the fuselage. The aerialtube is not included
in the kit. On no account use metal tubing! Mount the On/Off
switch on the servo plate 13 inside the fuselage. The canopy is
taken off to switch the radio on or off.
Tuöulators
The wings of the DG 600 can be fitted with optional turbulators.
lf you wish to fit them, cut two narrow, 2 mm wide strips lrom the
tape 57, using a steel straight edge and a sharp knite. They
should be 300 mm long. These strips are stuck down on the
plug - in wing extensions, running from the tip inboard, parallel
to the leading edge, and about 25mm apart. Cut through the
tape at the wing - extension joint line.
The effect of the turbulators is to improve control and handling
characteristics atthe lowend ofthe speed range, just as they do
on the tull-size aircraft. For slow flight in thermals they promote
accurate, elegant circling, and the turbulators prevent asymme-
trical stalling (tipstalling) i.e. the model stalls gently, straight
ahead.
The turbulators convert the laminar airflow to a turbulent flow,
which is able to tollow the airfoilsection lor much longerwithout
breaking up; this can lead to considerable loss in performance
at slow flight speeds.
Balancing
Your DG 600 must be balanced at the marked Centre of Gravity
before you attempt a flight. Minor inaccuracies in construction,
which are unavoidable in modelling, may result in the CG posi-
tion shown not being exactly correct; even a very small differ-
20
ence in wing sweep angle will affect the CG position noticeably.
Forthis reason the model is initially balanced at an average CG
position, which will in all cases be good enough for test flights.
The ideal CG position can then be established toryour particu-
lar model during test-flying. This average CG forthe DG 600 is
at the wing joiner blade position.
I/ark the CG on the underside of the wing roots using a felt -tip
pen. Fit out the model completely, including radio equipment,
canopy and tail surlaces.
The model can simply be balanced on your fingertips; this is
quite accurate enough for the initial average CG position. Add
lead ballast to the fuselage nose untilthe model balances with
the nose inclined slightly downward. You will need between 1 00
and 300 grams of lead, depending on your methods ol cons-
truction and finishing and the type of radio installed. Secure the
ballast with foam rubber or Velcro taoe.
Test-flying
The model is now ready to be launched by winch from a ground
take -ofl. Forthe firstflightwe recommend fitting the plug-in ex-
tensions. Switch the receiving system on and carry out a check
oI all controls. Check once more that the control surfaces move
in the correct direction corresponding to stick movement. When
you are satistied, connect the winch line.
It is best if an assistant holds the model steady, concentrating
on keeping the wings level. Give the signalto release the model
as soon as there is sufficient tension on the line.
lmmediately after leaving the ground the model is in the n
,
dangerous phase of tne iaunci. tf tne model is allowed to cliffb
away sleeply lrom the ground, a stall is very likely. The model
will drop one wing and can only be recovered by applying oppo-
site rudder at once. To avoid this, never pull the model up stee-
ply immediately after lift - off, but wait a few moments until it has
achieved llying speed, even applying a little down -elevator if
necessary. Once the model is in a stable condition, the climb
can be continued; apply slight up-elevator to maximise launch
h e i g h t .
The winch operator should watch the degree of flex in the wings
during the whole of the winch launch, as this indicates the load
on the model, and tells him whethertoapply moreorless power.
In blustery weather a winch launch places considerable loads
on a model, loads which are exceeded only during aerobatic fly-
i n g .
After releasing the tow, trim the model tor accurate straight
tlight, with the Iuselage pointing in exactly the same direction as
the direction ol flight - either into wind or downwind. This is of
great importance if you wish to obtain maximum performance
from your model. An aircraft which is constantly yawing can
never gives its best performance, owing to increased Iuselage
drag and the angled airflow over the wings. Adjust the trans,-'!
ter trims until true "hands ofi" fliqht is achieved.
J
Now tly a few full circles, if possible in both directions, and ob-
serve how the control surlaces respond. lt is worth saying here
that all pilots develop their own ideas on how to tly an aircraft,
and we can only give general advice. It you tind one control ope-
rates too sharply or too sluggishly, eliminate the problem at
once hy reconnecting the linkage at the servo output arm. lt
makes no sense at all to fly a model for a long time with unba-
lanced control responses. Equally, do not alter the settings
once you have established a good combination.
It takes a certain amount of time to get the best performance out
of any good sailplane with the controls set up in a particularway,
let alone when you constantly make changes.
lf you still have enough height, check the CG position right on
your first test flight. However, do not attempt it if you are getting
low. lt is much better in that case to land and carry out the test
during a second llight.
The simplest and quickest method of checking the CG is to in-
vestigate the model's recovery lrom an intentional dive. This
characteristic is a function of the interaction between Centre of
Lift and Centre of Gravity at different speeds. We must point out,
however, that this method represents a fine-tuning procedure,
and it will lail completely il you have made gross errors in cons-
truction, or it the average CG position shown has not been ad-
hered to.
Place the model in a dive by holding in down-elevator for a few
moments. Release the stick. lf the model is balanced correctly,
it will recover from the dive by itself in a broad, gentle curve. lf