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adhesive – before bonding the frame securely into the fuselage with a generous bead
of thickened epoxy. Allow to cure.
Tip: Some may wish to complete the job by adding a layer of wetted fibre glass
cloth over the entire servo frame allowing about 10mm extra on both sides to bond
with the fuselage sides.
Install the rudder & elevator Servos.
Test fit and install the rudder and elevator servos in the cut-outs in the servo
mounting frame according to the instructions supplied with the servos. Cut the rudder
and elevator linkages to length and solder clevis adaptors securely to the wire ends
having first thoroughly cleaned and prepared the joint. Fit clevises and lock-nuts and
adjust accordingly such that the control surfaces are held at neutral when the servo
positions are centred.
Tip. Suitably thickened epoxy may also be used to fix the clevis adaptors to the
control linkages (as an alternative to solder). This method is more appropriate in
the case of glass fibre push rods. In either case it is good practice to apply a small
piece of heat-shrink tubing over the
Finally secure the Bowden cables to the inside of the fuselage side with a little
suitably thickened epoxy to ensure slop free control linkages.
The Wings
The wing panels are supplied largely complete and require only the minimum of
installation work and finishing.
Wing Joiner
The ALPINA 2501 ELEKTRO features a floating joiner, meaning that the opening is
the fuselage is approx. 1 mm larger than the diameter of the wing joiner. This system
is widely used in full-size aircraft and has been well proven over many years of model
design and manufacture. The main wing joiner consists of a single Ø 10 mm
hardened steel wing-joiner which is ample to carry the flight loads. The fuselage is
suspended between the wing panels on four steel incidence pins – the combined
shear strength of which is more than one ton!
Installation of the wing incidence pins
Work carefully when drilling the holes in the wing roots to accommodate the
incidence pins as these determine the incidence (with respect to the fuselage).
Using small screw-clamps, carefully fix small 3mm thick pieces of scrap Balsa to the
top and bottom surfaces of the wing at both leading and trailing edges. The upper
pieces should be positioned to overhang the wing root by a few millimetres - to act as
guides along the fuselage wing fairing.
Position one wing panel carefully against the fuselage fairing at the leading and
trailing edge, using the small Balsa pieces as guides, and tape it firmly in place. Now
mark the position of the holes for incidence pins on the wing root by working through
Graupner GmbH & Co. KG * Henriettenstraße 94-96 * D- 73230 Kirchheim/Teck *
10
Fig 9. Battery & Servo Frame
joint.
www.graupner.de
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