Installing The Wing Control Horns; Wing Servo Wiring - GRAUPNER Alpina 5001 Pro Series Manual

Glue the plywood servo frames into the factory prepared servo wells. Note that In the case of
the ARF version, the plywood servo frames are pre-installed at the factory. Temporarily
install the servo covers using the screws provided and carefully mark the position of the exit
scoops. Extend these to each of the control surfaces and mark the position of the relevant
control horns – ensuring that the position of each control horn is at 90° to the servo arms.
Remove just sufficient polystyrene to the inside the factory prepared servo-wells to
accommodate your chosen servos. Alternatively remove all of the polystyrene to reveal the
inside of the upper wing skin and then apply a layer of suitably treated
100 gr / m² glass cloth to prevent any indentations appearing in the upper surface of the wing
when the servos are installed.

Installing the wing control horns.

Note: ARF customers will need to remove a little of the covering material while those
building the ARC version may prefer to wait until after the wings have been covered before
bonding the control horns in place.
Ailerons: Mark out the position of the aileron control horns on the lower surface of the aileron.
The horn should be positioned directly opposite the scoop in the servo cover and about 3
mm from the aileron leading edge.
Drill a series of 2mm diameter holes and cut away the excess to form a neat slot to
accommodate the supplied GRP control horns. Take care not to cut through to the upper
surface of the aileron and undercut a little of the material inside the slot to allow for additional
adhesive.
Locate the aileron control horn such that the eye is at 90° to the hinge line and about 12mm
above the lower surface of the aileron.
Flaps: Similarly locate the slots to accommodate the supplied GRP control horns about 3mm
behind the leading edge of the flap such that the eye is located about 10mm behind the flap
leading edge and about 13mm above the lower surface of the flap.
As before, drill a series of 2mm diameter holes and cut away the excess to form a neat slot
to accommodate the supplied GRP control horns. Take care not to cut through to the upper
surface of the aileron and undercut a little of the material inside the slot to allow for additional
adhesive.
Once satisfied with the position of the control horns, roughen the ends of each and bond the
GRP control horns into place using thickened epoxy and allow to cure.

Wing servo wiring.

Given the number of wing servos present, take time to consider how best to achieve the
electrical connections between the receiver in the fuselage and the wing servos. Individual
aero-modellers will no doubt have their own preferences, but we would recommend the use
of quality polarised connectors with Gold plated contacts, a combination of either D-Type
connectors, or high current (green) plugs & sockets.
Prepare the cable harnesses & connectors required to connect the wing mounted aileron and
flap servos to the receiver system in the fuselage. The connectors may be either fixed into
the wing and/or fuselage, or left on flying leads. However, it is generally recommended that
Graupner GmbH & Co. KG, Henriettenstraße 94-96, 73230 Kirchheim
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Fig 13. Wing Control Horns
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