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Note:
Areas of the fuselage which are to be glued should be rubbed down with medium-grit abrasive paper to remove
any lingering traces of mould release agent. Aim at reducing the glossy surface to a matt finish, especially when
dealing with smooth, shiny GRP parts, otherwise there is little chance of a durable glued joint. Parts to be glued
must be dry and free of grease and dust.
For technical reasons many of the factory-fitted plywood parts are not completely bonded to the GRP skin; this
applies in particular in the area around the turbine installation. Check all joints very carefully and apply
thickened UHU endfest 300 (slow-setting epoxy) or laminating resin to the joints to strengthen them. It is
important to check each joint individually!
The plywood parts for the HARPOON are machine-cut to shape, but they may need fine trimming to obtain a
perfect fit. This applies in particular to the small parts which make up the servo mounts.
As already described in the Introduction, you will find that the kit contains very highly pre-fabricated airframe
components of excellent quality moulded in GRP, some of them with sandwich reinforcement, with virtually
faultless multi-colour pigmented surfaces. The retract unit openings are machined out, and the turbine access
hatch is hinged. All the control surfaces on the wings and fins are pre-hinged, horn slots are machine-cut,
pushrod slots prepared, wing joiner sleeves installed, incidence pegs and holes for the screws which hold the
wings against the fuselage pre-cut - all the most difficult and essential tasks have been completed at the factory,
although minor trimming and adjustment may well be necessary. Before you start construction, and before
you begin any individual stage, please read right through the instructions or the relevant section of text
several times. Many details become clear when you study the picture gallery and stage illustrations, even if
the text description sounds difficult or complex. As already explained in the introduction, this model is
intended exclusively for advanced modellers with a corresponding level of experience in building and
flying. For this reason these building instructions do not explain basic modelling terms and techniques.
Turbine access hatch
The hatch is machine-cut at the factory, and attached to the fuselage using an elasto-hinge. It is retained at
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the rear (turbine efflux end) by means of two steel pins (No. 28).
Drill parallel 3.2 mm Ø holes on both sides of the turbine access opening to accept the guide tubes (No. 29)
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(3.2 Ø x 2.2 Ø x 330 mm). Measure the position of the holes carefully, and check that they are parallel and
symmetrical. The correct position is shown in Fig. 1.
Glue the plywood strips (No. 17) on both sides of the fuselage along the hatch opening, forming a stop strip
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for the hatch on both sides (Fig. 1a).
Close the access hatch and tape it shut, flush with the fuselage skin.
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Slide the guide tubes (No. 29) into the 3.2 mm Ø holes you have just drilled, and check that they are aligned
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correctly and exactly parallel. Measure carefully and check by eye, then glue the tubes in place using thick
cyano (activator spray) (Fig. 1b).
When the glue has set hard, cut through the two tubes (No. 29) in the gap between the access hatch and the
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fuselage (Fig. 1c); the turbine hatch can now be opened again.
The hatch is held closed on the fuselage by means of two 2 Ø x 250 mm rods (No. 28) (Fig. 2). Before you
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slide the steel rods into place remove the steel linkage balls from two ball-links (No. 57) and solder them to
one end of the rods - this makes it easier to grip them, and they can no longer slip inside the guide tubes and
get lost (Fig. 1d).
Glue the plywood formers (No. 19) in place as shown (Fig. 1e) using cyano, fitting them parallel to the
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guide tubes (No. 29). They may need to be curved to follow the curvature of the fuselage hatch.
Mix up some thickened epoxy and glue the woven glass tape (No. 30) over the joint between the guide tubes
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and the plywood parts on the access hatch, as shown in (Fig. 1f); laminate a little glass over the guide tube
itself too. Be sure to roughen the surfaces thoroughly beforehand using abrasive paper, as mentioned
in the introduction to these instructions, to guarantee a strong glued joint. As with all the other glued
joints in this model it is important to produce really strong joints between the guide tubes and the
plywood formers because the hatch and retainer system are subject to severe aerodynamic loads
when the model is in flight.
GRAUPNER GmbH & Co. KG D-73230 KIRCHHEIM/TECK GERMANY
Änderungen vorbehalten! Keine Haftung für Druckfehler! Ident-Nr. 0057999
04/2003
All manuals and user guides at all-guides.com
Building instructions
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