Installation Of The Incidence Pins - GRAUPNER Tangent Alpina 4001 PRO Notice De Montage

The ALPINA 4001 PRO features a floating wing joiner; the opening is the fuselage is
approx. 1.5 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 fuselage is suspended between the inner wing panels on four Steel incidence pins.
Work carefully when drilling the holes in the wing roots as these determine the wing
incidence. 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 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.
Installation of the wing incidence pins
Start by preparing the four Steel incidence pins. They should be thoroughly de-greased
using alcohol and the surfaces to be bonded must be prepared with abrasive paper to
ensure a good bond. The pins should protrude about 12 – 15mm from the wing roots. 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.
Once both wings have been marked and drilled, carefully check the alignment before
bonding the incidence pins into place. Apply a suitable release agent to the holes in the
fuselage fairing before applying a suitably thickened epoxy. Then fit the wings to the
fuselage, with the steel joiner installed to allow the epoxy to cure overnight.
Tip: Use a layer of kitchen film between the wing/fuselage joint to avoid any excess epoxy
from forming a permanent joint!
Graupner GmbH & Co. KG * Henriettenstraße 94-96 * D - 73230 Kirchheim/Teck *
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Fig 6 & 7. The wing Mount
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