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Specification
Wingspan:
Fuselage length:
Total surface area:
All-up weight:
Total surface area loading:
Introduction, notes on the building instructions
Many thanks and congratulations on your choice of a model aircraft
from the robbe Modellsport range. This is an ARF (Almost Ready to
Fly) model, i.e. the major components are supplied factory-built and
covered.
This model is only suitable for modellers with a certain level of expe-
rience and skill, and for this reason the building instructions have
deliberately been kept short.
Some procedures are only sketched-in, and should be considered
simply as guidelines and sources of inspiration.
The model should be assembled as shown in the stage photos,
which also reflect the correct sequence of assembly. The text instruc-
tions only point out areas where particular care is required.
The covering
Temperature fluctuations during transport may result in partial loss of
tension in the covering film.
You can make the film taut again by playing warm air over it from a
heat-gun, and smoothing the film down carefully.
Note that the covering film must be removed at all points where com-
ponents are to be joined. Hold the parts together and mark the joint
areas with a felt-tip pen, then cut away the film just inside the mar-
ked lines. Please take great care not to cut into the wood when you
slit the film.
Radio control system
When selecting the radio control system components please bear in
mind that only small, lightweight units should be fitted in order to
save weight and space.
Power system and flight battery
The Spirit 3-D is designed for a brushless out-runner motor in con-
junction with a suitable speed controller. The recommended flight
battery is a three-cell (11.1 V) Li-Po battery of 830 mAh capacity.
Assembling the model
Ailerons
- The aileron servos are installed in the underside of the wings.
- Install the aileron horns - Figs. 2 - 4.
- Install the aileron servos and set them to neutral from the trans-
mitter.
- Connect the pushrods to the horns, then to the servo output discs.
Fit the output discs on the servos - Figs. 5 - 7.
Tail panels
- Connect extension leads to the rudder and elevator servos. Install
the servos, running the leads forward towards the nose. The ser-
vos can be mounted using glue or screws - Figs. 8 and 9.
- Glue the horns in the rudder and elevators - Figs. 10 and 11.
- Remove the rudder from the fin. Place the tail panels on the fuse-
lage, align them carefully and glue them in place - Figs. 12 - 14.
- Apply epoxy to the slots for the rudder hinges, and attach the rud-
der to the fin - Fig. 15.
- Connect the pushrods to the horns. Remove the servo output arms
and set the servos to centre. Connect the pushrods to the output
arms, and fit the arms on the servos - Figs. 16 and 17.
Main undercarriage
- When fitting the wheel spats to the undercarriage legs please
check that the undercarriage is facing forward (Fig. 22). Install the
undercarriage legs. Position the wheel spats carefully, drill the Ø
1.5 mm hole for the retaining screw and secure the spats.
(Fig.18-22)
Assembly and operating instructions
Spirit 3-D ARF
approx. 1000 mm
approx. 830 mm
approx. 25 dm
2
approx. 500 g
approx. 20 g / dm
2
7
Fitting the wing panels
- Remove the covering film to allow the aileron servo leads to enter
the fuselage. Slide the CFRP tube through the fuselage and fit the
wing panels on it, running the servo leads into the interior. Secure
the wings to the fuselage using the screws provided - Figs. 23 and
24.
Power system
- Glue the motor mount to the fuselage, noting that downthrust and
sidethrust are required - Fig. 25.
- Before installing the power system be sure to read through the
instructions supplied with the motor and speed controller. Connect
the motor to the controller. Fit suitable connectors to the battery
wires attached to the speed controller, taking care to maintain cor-
rect polarity.
- Screw the motor to the motor mount - Fig. 26. Position the speed
controller below the motor. Bundle the wires together so that they
cannot foul the motor.
Final work
- Cut away the cowl at the front as shown, place it over the motor
and centre it relative to the motor shaft. The cowl can be held in
place by screws or adhesive tape - Figs. 27 and 28.
- Connect the speed controller and servos to the receiver. Connect
the aileron servos to the receiver using a Y-lead. Run the receiver
aerial out of the fuselage through the cabin opening, and tension it
to the fin.
- Open the battery compartment in the underside of the fuselage and
place the flight battery inside; do not connect it at this stage - Fig.
29.
Checking the working systems
- Set the control surface travels as stated.
- The stated control surface travels are recommended for normal
flying. For 3-D flying the throw should be increased to suit your
flying style.
- Check the direction of rotation of the motor; if you need to reverse
it, refer to the instructions supplied with the speed controller.
- Fit the propeller on the motor shaft - Fig. 30.
Whenever you are working on the model with the power system
installed - for installation, maintenance and adjustment work - keep
well clear of the rotational plane of the propeller - injury hazard.
Balancing, Fig. 31
The Centre of Gravity "C.G" of our Spirit 3-D prototype is around 80
mm aft of the root leading edge. Mark the CG position and support
the model at the marked points.
The CG is correct when the model balances level. Adjust the position
of the flight battery if necessary, or fit lead ballast.
Test-flying
- Before attempting the first flight please read the sections in the
Safety Notes entitled "Routine pre-flight checks" and "Flying the
model".
- For the first flight wait for a day with no more than a gentle breeze.
Seek out a large, flat, open field for your flying site, devoid of obsta-
cles such as trees, fences, high-tension overhead cables etc.
- Check all the working systems one last time.
- The model must be launched directly into wind.
- The aircraft can be hand-launched or taken off from the ground.
- Adjust the trims if necessary so that the model climbs steadily
"hands off".
- Check the model's response to control commands. You may wish
to adjust the mechanical linkages (to increase or decrease travels)
after the first landing.
- There is no need for full power during normal flying. Never fly at full-
throttle in a dive.
- Check the aeroplane's stalling characteristics at a safe height, and
carry out the landing approach at a safe speed.
robbe Modellsport GmbH & Co. KG
We reserve the right to alter technical specifications.
No.
3142
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