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Speedbrake
Cut out the speedbrake along the marked rectangular shape. In our pictures you will see radiussed corners,
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but these are more difficult to cut and are not strictly necessary. Tape a steel ruler to the surface (Fig. 2) so
that you can score the lines with a sharp knife, then cut along them using a thin sawblade (Fig. 2a).
Caution: the speedbrake is already attached to the fuselage using an elasto-hinge. Take care not to cut
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through the elasto-hinge using the knife or sawblade.
The speedbrake can now be opened carefully; move it to and fro several times to free the hinge. Cautiously
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adjust the gap between the brake and the fuselage skin at the hinge end using abrasive paper or a triangular
file, so that the speedbrake is able to open through 70 - 80º (Fig. 2b).
The small pieces of plywood (No. 18) act as stop-pieces at the rear of the speedbrake; glue them to the
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fuselage as shown, using thick cyano (Fig. 2c).
If you accidentally detach the speedbrake completely, i.e. you cut through the elasto-hinge, you can re-
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attach it using the two pin-hinges (No. 31) and steel rod (No. 32) supplied in the kit: tape the speedbrake to
the fuselage as shown in (Fig. 2d), cut holes for the pin-hinges (No. 31), and align the pivot axis of the
hinges (No. 31) using the steel rod (No. 32). Glue the hinges in place on the inside face using 5-minute
epoxy. Apply glass cloth (No. 30) over the hinges to reinforce the joint.
Retractable undercarriage
The retract units are fixed to factory-installed plywood supports through machined openings in the wings,
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using the self-tapping screws (4 x 20, cross-head, 12 off) supplied with the retract set, Order No. 175. Be
sure to drill 2.3 mm Ø pilot-holes beforehand, otherwise the plywood plates may split or burst. (Fig.
3)
Align the retract units with the machined openings, i.e. the main retract units should be parallel with the
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spring struts when retracted (Fig. 3a).
Retract the noseleg, set the wheel leg parallel to the machined opening (looking through the cabin opening),
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and align it parallel to the factory-fitted fuselage reinforcement bulkheads (Figs. 3b, 3c). Align the unit
carefully, mark its position, drill the pilot-holes and fit the retaining screws.
If necessary trim the shape of the retract unit openings to match the outline of the units when retracted. It is
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important to leave sufficient space between undercarriage legs and wheels in the underside of the fuselage
to ensure that the wheels can still be extended and retracted without fouling at any point even if the legs are
slightly bent or dirty.
Connect the retract units (Order No. 175) as described in the instructions supplied with the set, and deploy
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the air lines in such a way that the hoses (especially the brake lines) cannot become kinked when the units
are retracted or extended, or get tangled with other hoses when retracted. Install the self-adhesive retainer
plates (No. 33) and cable ties (No. 34) to hold in position the pressure hoses for the retracts and brakes. The
air lines and cable looms can also be secured using soft binding wire (71).
Tape the brake hoses to the undercarriage legs and run the air hose into the fuselage under the wing skin,
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between the outer skin and the retract unit support plate. Allow plenty of excess hose so that there is no
chance of it being placed under strain (Fig. 3d).
We recommend running the nosewheel steering cables (No. 46) to the steerable noseleg unit at this stage,
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i.e. before you install the unit (Fig. 3e).
If you are using the original valves from Order No. 175 screw the two valves to the valve plate (No. 24)
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using the screws and nuts (No. 36 / 37). The servos (C 261 shown) can be fixed in place using thick cyano
(Figs. 4, 4a, 4b, 4c).
Attach the prepared valve plate (No. 24) to the right-hand longitudinal member at the front of the fuselage
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using the fixings (No. 38, 39, 40), as shown in (Fig. 4).
Pack the air bottle for the retract system in foam, and install it in the fuselage nose forward of the retract
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unit bulkhead.
If you prefer to use digital control valves (2 valves required), fix the valves to a piece of plywood (not
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included in the kit) (Fig. 4d) and glue it in the front part of the fuselage in the same position as the
mechanical valves, as shown in (Figs. 4, 6a).
Fix the Servo-Lock (No. 41) to the floor former (No. 23) using the self-tapping screws (No. 42) (Fig. 5),
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then glue the former to the bottom of the fuselage using UHU plus endfest 300 as shown in (Fig. 5a), with
the relieved side flush with the cut-out of the steerable noseleg unit.
Make up the linkage at the servo end from parts (No. 43, 44, 45, 46, 47) (Figs. 5, 5a, 5b). The steering
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cables for the steerable noseleg unit are passed through short pieces of brass sleeve (No. 45); they can
either be soldered or simply crimped.
Bend the steel rod (No. 49) to the approximate shape shown in (Fig. 6), and attach it to the noseleg unit
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bulkhead using the self-tapping screw (No. 50) (Fig. 6a).
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
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