ROBBE ASW 28 GRP 3m Building And Operating Instructions page 4

Fig. 23
- Check the centre position of the servo output arm: the lever
must be at an angle of 90° to the wing. Position the servo
accurately, and tack it in the wing using a few drops of
cyano-acrylate.
(the servo is not glued in place permanently until the servo
well cover has been trimmed to fit.)
Fig. 24
- Screw the M2 nut and clevis onto the pushrod for about
twenty full turns, then connect the pushrod to the servo
output arm.
Fig. 25
- Drill the hole in the aileron for the horn, directly in line with
the servo output arm. Connect the aileron pushrod and
glue the horn in the aileron.
Mark the correct length of the pushrod and form a Z-bend
in the plain end. Connect the pushrod to the horn.
Fig. 26
- Cut out the servo well covers along the marked line.
Trim the cover to fit the servo well in the wing. Ensure that
the servo output arm does not foul the cover at any point
in its travel.
Fig. 27
- Trim the cover to fit neatly in the servo well, and sand
the edges lightly. Now lightly sand the heat-shrink sleeve
round the servo before gluing the servo in its final position.
Fig. 28
- Attach the servo well cover to the wing using the double-
sided adhesive tape supplied: first stick the tape to the
edge of the servo well, and cut away any excess tape. Now
press the cover firmly into place.
Fig. 29
- Trim the output slots of the servo well cover to suit; the
pushrod must not foul it at any point. The control surface
must move freely and smoothly.
4
Building and Operating Instructions - ASW 28 GRP 3m
Fig. 30
- Extend the airbrake servo lead by about 600 mm, and
secure the plug / socket connection with a heat-shrink
sleeve. The servo output arm must be at an angle of 90°
to the wing. Position the servo carefully and tack it in the
wing with a few drops of cyano-acrylate.
(the servo is not glued in place permanently until the servo
well cover has been trimmed to fit.)
Fig. 31
- Screw the M2 nut and clevis onto the pushrod for about
twenty full turns. Glue the end of the airbrake pushrod in
the threaded coupler.
Mark the correct length of the pushrod, and cut it to length.
Connect the pushrod to the outermost hole in the servo
output arm.
Fig. 32
- Cut out the servo well covers along the marked lines, and
trim them to fit neatly over the servo wells in the wings.
Ensure that the pushrod and the servo output arm do not
foul the inside of the well cover at any point. Lightly sand
the heat-shrink sleeve round the servo, and glue the servo
in its final position.
- The servo well cover should be fixed to the wing using the
double-sided adhesive tape supplied: first stick the tape to
the edge of the servo well, then cut away any excess tape.
Now press the cover firmly into place.
- The servo output arm must not foul the wing or the well
cover. Move the servo to both end-points in turn, and
adjust the linkage so that the brakes reliably extend and
retract at the appropriate end-points, without the servo
being mechanically obstructed (stalled).
- Alternatively the servo well covers can be secured using 2
x 6 mm screws: mark the position of the screws, and drill
1.6 mm ∅ pilot-holes for them.
- Repeat stages 23 - 32 for the second wing panel.
Fig. 33
- There are various alternative methods of closing and ope-
ning the wheel doors. The simplest method is to attach a 1
x 5 x 30 mm rubber band to the wheel axle and the wheel
doors.
Fig. 34
- You will need to cut openings in the wing root ribs and the
facing ribs on the fuselage to clear the servo connectors.
When rigging the model, slip the leads through the ope-
nings in the fuselage, and connect them to the receiver.
Fig. 35
- If you intend to use high-current connectors, you will need
to cut out suitable openings in the root ribs and the wing
root fairings. Solder the servo extension lead to the plug,
insulate the joints, and glue the plug in the root rib. Solder
the socket to the receiver lead in the fuselage, and connect
it to the receiver.
Fig. 36
- On this model the Centre of Gravity "C.G." is located at
approximately the 68 mm point (measured from the wing
root leading edge).
- Support the model under the wings on both sides of the
fuselage using your index fingers, and allow it to hang
freely. Ideally the model will now balance level, with the
nose inclined slightly down.
- Add lead ballast to the extreme fuselage nose to set the
correct C.G.
- Once you have established the correct amount of lead
ballast, secure it in such a way that it cannot move during
flight, as this would alter the model's balance.
No. 2585