User Manual

Graupner

GmbH & Co. KG * Henriettenstraße 94-96 * D- 73230 Kirchheim/Teck * www.graupner.de

the holes in the opposite side of the fuselage using a sharpened 3mm steel rod (or

similar tool).

Remove the wing and drill the holes in the wing root using a 3mm twist drill.

Remember to take account of the wing dihedral; the holes should be drilled parallel to

the wing joiner. Once both wings have been marked and drilled, the four incidence

pins can be bonded into place using a slow setting thickened epoxy. Be sure to make

one pin in each wing a little longer than the other, and round off the end of the pins to

facilitate easier assembly at the flying field.

Note! Apply a suitable release agent (floor wax works well) to the holes in the

fuselage sides and to the fairing itself before applying the adhesive, then fit the

wings to the fuselage, with the steel joiner installed to allow the epoxy to cure

overnight

Fig. 9. Floating Wing Joiner

Installing the Nylon wing locks.

Note: Customers building the ARC version may prefer to wait until after the wings

have been covered before completing this step.

The supplied Nylon wing locks are used to secure the wing joints. The sockets have

already been installed in the fuselage wing root. The matching plugs are required to

be glued into the wing roots to complete the joint.

First check the plugs fit the holes provided in the wing roots and adjust if necessary.

Once the holes have been adequately prepared, glue the plugs into the wing roots

and with the steel wing joiner installed, engage the wings firmly with the mating

sockets and ensure correct alignment. Take due care when completing this step to

avoid the effects of any excess epoxy.

Tip. Cover the fuselage wing roots with kitchen film (or similar material) to protect

the surface and apply a releasing agent to the locks themselves while the epoxy

cures. Once cured, the wing locks are easily separated by applying firm pressure,

by hand, along the leading edge of the wing.

Installation of the wing servos.

The TA Servo LOCK system supplied with your ALPINA 2501ELEKTRO kit provides

a universal wing servo mounting mechanism which is both simple and very secure.

Remove sufficient polystyrene to the inside the factory prepared servo-wells to

accommodate your chosen servos up to the inside of the upper wing skin. Reinforce

the area of the upper wing skin with a small piece of 100 g./dm ² glass cloth and

epoxy resin. This prevents stress points in the upper wing skin as a result of installing

the servos. Finally glue the plywood servo mounting frames to servo openings in the

wings.

Note: In the case of the ARF version, the plywood servo frames are pre-

installed at the factory.

The servos themselves are simply bonded to the inside of the servo cover scoop

using suitably thickened epoxy and screwed onto the plywood frames (see also the