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Building instructions
Note: when you apply a "right" aileron command, the right aileron - as
seen from the tail, looking forward - deflects up. At the same time the
right flap also moves up, but only half as far. When the aileron deflects
down, the flap does not follow the aileron down => differential!
If your radio control system does not cater for the travels stated above, then
you will need to make mechanical adjustments at the control surface linkages.
55. Safety notes
EN
Please ensure that all the radio control components are correctly installed
and connected. Check the control surface neutral position and travel, and
the direction of servo rotation. Check that all the control surface linkages
are smooth and free-moving.
Take particular care that none of the cables can foul the rotating motor
case, and secure them with hot-melt adhesive if necessary. Check the
direction of rotation of the motor once more - but carefully!
Caution: The strength of the airframe is high - but it is not comparable
with that of all-GRP and all-CFRP types. The model's performance is
characterised by safe, stable handling when circling. This allows it
to gain height rapidly in thermals, after which long distances can be
covered to find the next area of lift.
Speed flying and aerobatics should only ever be flown with the ailerons
and flaps at the "Speed" setting. Crow braking (butterfly) should not
be attempted at high speed; the severity of the pull-out should always
be matched to the model's airspeed!
The model's maximum flying speed should be adjusted (reduced)
in turbulent air and variable weather conditions. In calm air it is
permissible to fly somewhat faster (max. approx. 130 km/hr).
Provided that you observe these recommendations your model will
provide many hours of pleasure over a long period.
The purpose of the "Spoiler" function is to shorten the landing approach
by deflecting both ailerons up and both flaps down (known as Butterfly or
Crow mode). This causes a change in pitch trim which is corrected with
a simultaneous down-elevator deflection, in order to keep the model in a
stable attitude. This function can only be used if your transmitter provides
the appropriate mixers. For more information please read the instructions
provided with your radio control system.
If you need to make the model descend from a great height (e.g. limits of
vision in a powerful ther-mal), we recommend staying in Normal mode and
extending the crow brakes; this enables you to lose height carefully and
steadily (not too steep a descent). This may take quite a while, but it repre-
sents the safest means of losing height without overstressing the airframe.
When required, the butterfly / crow setting is the key to steep, accurate
landing approaches even in difficult conditions (slope lift).
Tip: if the landing area is rough or covered in tall grass, we recommend
retracting the butterfly / crow brakes shortly before touchdown, to avoid
placing a strain on the flap hinges and linkages and possibly damaging them.
56. 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.
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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.
57. Maiden flight ...
The aircraft is designed to be hand-launched (always into wind).
If you are a beginner to model flying, we strongly recommend 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.
58. 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, and you will need a lot of skill
to make use of them. With a little practice you will be able to recognise
likely trigger points for thermals in the local landscape. The ground warms
up in the sun's heat, but heat absorption varies according to the type of
terrain and the angle of the sun's rays. The air over the warmer ground
becomes warmer in turn, and the mass of warm air flows along close to
the ground, driven by the breeze. Strong winds usually prevent thermal
build-up. Any obstruction - a shrub or tree, a fence, the edge of a wood, a
hill, a passing car, even your own model on the landing ap-proach - may
cause this warm air to leave the ground and rise. Imagine a drop of water
on the ceiling, wandering around aimlessly, and initially staying stuck to
the ceiling. If it strikes an obstruction it will fall on your head. A triggered
thermal can be thought of as the opposite of the drop of water.
The most obvious thermal triggers include sharply defined snow fields
on mountain slopes. The air above the snow field is cooled, and flows
downhill; at the edge of the snow field, part-way down the valley, the cool
air meets warm air flowing gently uphill, and pushes it up and away as if
cut off by a knife. The result is an extremely powerful but bumpy thermal
bubble. Your task is to locate the rising warm air and centre your model
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