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and / or glue the appropriate number of ballast balls 40 in
the fin. We cannot state exactly how much ballast is required
due to manufacturing tolerances in the foam density, and the
different airborne equipment for the glider and electric glider
versions. Mark the location of the airborne components in
the fuselage once you have found the correct location, so
that you can be sure always to replace the battery in the
same position. Apply the fin sticker over the trim weight
openings.
Fig. 41
39. Setting the control surface travels (guideline only!)
The control surface travels must be correct, otherwise the
model will not respond harmoniously to control commands.
All travels are measured at the widest point of the control
surface concerned.
Elevator
up
(stick back)
down
(stick forward) approx. - 10 mm
Powermix
Down-elevator mix with Flap
speed / thermic
Rudder
left and right
each side of centre
Ailerons
up
down
Flap
Flaps (camber-changing flaps)
aileron
up
(Speed)
down
(Thermic)
Spoilers (butterfly)
both ailerons up
both flaps down
Down-elevator mix with spoiler approx. - 5 mm
Both ailerons can be set to move up and both flaps move
down simultaneously in order to provide a "spoiler" func-
tion, i.e. to shorten the landing approach; this is known as
the "butterfly" or "crow" braking system. At the same time
a suita-ble amount of down-elevator trim must be mixed
in to keep the model in a stable attitude. This can only be
done if your radio control system features suitable mixers.
If you are not sure of this, please refer to the instruc-
tions supplied with your radio control system.
The Butterfly adjustment allows if needed steep and targe-
ted landing approaches in difficult terrain.
Note: when you apply a right-aileron command, the right-
hand aileron - as seen from the tail, looking forward - must
deflect up.
Simultaneously, the right flap halfway with running upwards.
When an aileron down the flap does not work with down!
approx. + 10 mm
approx. - 0,5 mm
approx. -1,5 /-1,5 mm
approx. 20 mm
approx. + 16 mm
approx. - 8 mm
approx. +2 / -2 mm
approx. + 10 mm
approx. + 3 mm
approx. - 3,5 mm
approx. + 22 mm
approx. - 26 mm
If you cannot set the stated control surface travels using your
radio control system's electronic adjustment facilities, you
may need to connect the pushrod to a different linkage hole.
Ensure that all the radio control system components are
properly installed and connected. Check the control surface
centres and travels, the direction of rotation of the servos,
and the freedom of movement of the control system com-
ponents. Ensure that the power leads cannot come into
contact with the rotating motor barrel (secure them with
hot-melt adhesive). Check once more that the motor shaft
rotates in the correct direction - please take care!
40. Preparations for the first flight
For the first flight wait for a day with as little breeze as
possible; the evening hours often offer calmer conditions.
It is essential to carry out a range-check before the first
flight! Please follow the instructions laid down by your RC
system manufacturer.
The transmitter battery and flight pack must be fully charged
in accordance with the manufacturer's recommendations.
Before switching the system on, ensure that your chosen
channel is free; this does not apply if you are using a 2.4
GHz system.
If you are unsure about any point, do not fly the model! If
you cannot identify and cure the problem, send the whole
RC system (including battery, switch harness and servos)
to your system manufacturer for checking.
41. Maiden flight ...
The aircraft is designed to be hand-launched (always into
wind).
If you are a beginner to model flying, we strongly recom-
mend that you ask an experienced modeller to help you
for the first few flights. Once the model has reached a
safe height, adjust the control surfaces using the trims on
the transmitter, so that the model flies straight and level
"hands-off".
Powered version: with the aircraft flying at an adequate
altitude, check how it responds when the motor is switched
off, so that you are familiar with its behaviour on the glide.
Carry out repeated simulated landing approaches at a safe
height, as this will prepare you for the real landing when the
battery is discharged.
Avoid flying tight turns at first, especially close to the ground,
and in particular during the landing approach. It is always
better to land safely some distance away than to risk a crash
by forcing the model back to your feet.
42. Thermal flying
Making the best use of flat field thermals is not particularly
easy, and calls for considerable skill and experience. Areas
of rising air are harder to detect and recognise at a flat field,
because they tend to occur at higher altitude than at the
hillside, where it is often possible to find lift while the model
is cruising along the edge of the slope, and then circle away
in it. A thermal at a flat field which occurs directly overhead
is very hard to recognise, and to exploit it to the full requires
a highly skilled pilot. For this reason it is always best to go
thermal seeking off to one side of where you are standing.
You will recognise thermal contact by the glider's behaviour.
Good thermals are obvious because the model will climb
strongly, but weak thermals take a practised eye to detect,
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