GRAUPNER MEGA DRAGSTAR III Instructions De Montage page 14

fibre cloth over the stern tube and the hull to ensure that the tube cannot come adrift.
A patch of fabric cloth can also be used if you have no glass cloth to hand.
8. The openings for the flood duct can now be cut out as shown in the drawing. If you are
an experienced marine modeller, you do not need to keep to the shapes shown; you
can cut them to the exact position and shape you wish; the only requirement is that
sufficient water can enter and air escape through them, to ensure that the flood duct
works correctly. The openings at the stern must be as large as possible, as the water
runs out through them when the boat is running. TIP: a good method of cutting the
openings accurately is to drill holes at all the corners, then file out the straight lines
between the holes using a round needle file. An alternative is to drill a line of holes
close together, and cut through the unwanted material between them. All the corners
of the openings should be rounded, as sharp corners form "stress raisers" at which the
hull might subsequently crack.
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9. Fill the whole of the flood duct with water through the opening, and check that the duct
is completely sealed from the hull: it must not be possible for water to enter the hull
through the flood duct. If you find a hole, plug it with UHU plus.
10. Drill a 6 mm Ø hole for the sealing tube (part 19) in the position shown on the plan.
Drill seven 1.5 mm Ø holes for the rudder system (part 15) and the turn fin (part 21) in
the stern of the hull. Fit the rubber bellows (part 18) on the sealing tube and glue the
bellows in the 6 mm Ø hole using cyano.
11. Attach the rudder system (part 15) to the stern using four retaining screws. Fit a
pushrod connector (part 16) on the underside of the tiller and secure it with an M2
plastic nut fitted on the top.
12. Remove the lug between the screw mountings (see plan) so that the rudder servo fits
in the two-part servo mount (part 20).
Attach the servo to the mount (part 20), and fix the mount to the servo base (part 5)
using four 2.2 Ø x 6.5 mm self-tapping screws. Fix the servo in place using two more
2.2 Ø x 6.5 mm self-tapping screws and two 2.8 / 7.0 Ø washers; make sure the servo
cannot shift.
13. Mount a pushrod connector (part 16) on the servo output arm and secure it with an M2
plastic nut. Slip the steering pushrod (part 19) through the rubber bellows from the
rear, and connect it to the pushrod connectors. In this position the servo base (part 5)
can be glued to the hull floor using cyano. TIP: check that this joint is really secure.
14. Fix the turn fin (part 21) to the stern using three retaining screws, as shown on the
plan.
15. The rest of the RC system components can now be installed in the model; they should
be attached using Velcro (hook-and-loop) tape. The same material is also used to
secure the drive batteries. NOTE: each battery should be secured using as long a strip
of tape (approx. 10 cm) as possible, otherwise they may come loose if the boat turns
over; in this case the altered Centre of Gravity might prevent the flood duct working
properly.
16. The aerial (part 22) can now be mounted on the model: drill a 2.5 mm Ø hole in a
suitable position (i.e. as far away as possible from the high-current motor leads). Bend
the steel whip aerial to the shape shown on the plan and fix it to the model using the
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