Installing The Winch Hook (If Required); Completing The Canopy; Installing The Canopy Catch - GRAUPNER TANGENT Alpina 2501 ELEKTRO ARC Manual

wait until the electrical connections to the wing servos have been installed before
finally installing the front strut. The two struts are bonded in using suitably thickened
epoxy.

Installing the winch hook (if required)

Using a flexible tape-measure, measure and mark a point 300 mm from the nose
along the underside of the fuselage. Drill a 2 mm hole to accommodate the winch
hook. Cover the hole on the outside with tape to protect the surface and roughen up
the inside of the fuselage in the area of the hole. Now glue the winch hook support
block into place centrally over the hole using thickened epoxy. Use the self tapping
screw, through the hole in the bottom of the fuselage to secure the support block
while the epoxy cures. Once cured, drill a 2mm hole in the support block to
accommodate the winch hook.
Tip: for additional security, you may wish to finish the job by laminating the support
block to the fuselage bottom using 2-3 layers of suitably wetted 120g fibreglass
laminating cloth.
Catapult launch hook (if required)
Some may wish to install a launch hook further forward in the nose for use with
alternative launch methods such as from a catapult. In this case follow the same
procedure as above, but we would recommend a position 100mm from the nose.

Completing the canopy.

The Carbon canopy is supplied ready made, requiring only minimal finishing. Place
the canopy on the fuselage opening, carefully check the joint and adjust as
necessary for a perfect fit. Minimum gap and good overall appearance will be your
just reward for a little extra time and effort at this stage.

Installing the canopy catch.

The forward canopy pin is held in place by the channelled hardwood support. The
support is glued to the inside of the canopy at a position such that the tip of the pin is
about 1mm inside the edge of the canopy – as shown. The canopy pin is likewise
glued into the channel in the hardwood support – such that the pin protrudes
sufficiently from the front of the support to engage with the rim of the fuselage
opening. Re-check and adjust as necessary to achieve a good fit. Be sure to roughen
the inside of the canopy with abrasive paper before gluing to ensure a good bond.
Once cured, test fit the canopy, and use a 3mm drill or suitable round file to form a
recess in the forward rim of the fuselage opening to accommodate the canopy pin.
The rearward canopy fixing is made using a U-shaped Steel spring fashioned from
the supplied length of piano wire. The open ends of spring are glued between the two
wooden strips such that the closed end of the spring protrudes about 2mm beyond
the rear edge of the canopy – as shown. Once set in place, cover the supporting
strips holding the spring with 1 -2 layers of fibre-glass cloth treated with a suitable
resin to ensure a strong bond with the inside of the canopy. Again, be sure to
Graupner GmbH & Co. KG * Henriettenstraße 94-96 * D- 73230 Kirchheim/Teck *
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Fig. 1 Fuselage Compression Struts
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