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The canopy decals are positioned as follows: lay the decals on the nose cone without removing the
backing film, position them carefully and mark a few reference points on the nose cone surface. The
canopy decals are best applied starting from the underside and working towards the centre. Minor
discrepancies at the centre joint line can easily be corrected using a sharp balsa knife.
Installing the towhook
If you intend to fly your CUMULUS XXL as a pure glider, you can launch it at a flat field site using a
bungee or winch system. In this case you will need to install a plastic towhook in the bottom of the
fuselage.
Drill two 3 mm Ø holes in the underside of the fuselage for the towhook.
The position of the holes is shown in the photo. The 47 mm dimension is the point at which the towring
will engage with the towhook.
Important: the hook should only be fitted if your CUMULUS XXL is to be used as a pure glider, as it
prevents the electric motor flight battery being installed.
approx. 47 mm
Assembling the CUMULUS XXL
Attach the V-tail assembly to the fuselage using the two countersunk screws provided.
Deflect the elevators down and connect the hooks on the linkage cables to the elevator horns.
Connect the wing-mounted servo leads to the receiver, then engage the wing centre section locating
dowel in the hole in the fuselage and secure the wing by fitting the plastic countersunk screw and
spreader plate.
Connect the two outboard wing panels to the centre section using the pre-formed steel rods,
connecting the aileron servo leads to the extension leads in the wing centre section at the same time.
Apply strips of tape over the top and bottom of the wing joints to prevent the outboard panels coming
loose.
Balancing the CUMULUS XXL
Assemble the model completely, ready to fly, and support it under both wing roots at a point about 80 -
86 mm aft of the leading edge. The model should now balance level, ideally with the nose inclined
slightly down. Re-position the flight battery if necessary until this is the case. Once you have
established the correct battery position glue a block of balsa in the fuselage to act as a locating piece.
For initial test-flights the CG should be at the forward end of the stated range.
Before every flight check that all control surfaces are exactly at centre (neutral) when the transmitter
sticks and trims are also at centre.
Control surface travels
Ailerons
22 mm up
Elevators
15 mm up
Rudder
15 mm right
Flap
3 mm down
Butterfly (Crow) setting
Ailerons
up
Flap
down
Elevators
down
Important:
When installing and adjusting the mechanical linkages it is vital to ensure that they all work smoothly
and are able to carry out their full travel - including trim movement - without fouling at any point, and
without being obstructed mechanically (servos stalled).
When you move the rudder stick to the right, the right elevator should move down and the left elevator
up. Pull the elevator stick back towards you, and both elevators should move up through the same
angle (forward stick = down). If you move the aileron stick to the right, the right-hand aileron should
rise, the left-hand aileron fall. Pull the Butterfly stick back towards you, and the ailerons should rise
and the flap fall. We recommend assigning the camber-changing flap to a slider on the transmitter; it is
best to limit the flap's travel electronically, so that the stated deflections are obtained at full travel of
the slider.
And now all that remains is to wish you many hours of pleasure building and flying your CUMULUS
XXL.
8 mm down
12 mm down
15 mm left
1.5 mm up
28 mm
35 mm
5.5 mm
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