Pelikan Daniel MT-180H Bauanleitung Seite 7

hicle speeds up – and this is it. Moving the control stick left or right has
more effect than simply turning the model. The rudder control will be
explained later.
Please note: The control is fully proportional – the more you move the
stick, the more movement of the control surface. The actual stick move-
ment required is mostly quite small, and almost never from one end stop
to the other!
Elevator controls the model in the vertical axis; apply up elevator and
your model's nose will raise (and the model will climb if it has sufficient
power), apply down elevator and your model will descend. Please note
that your glider can only climb if it has sufficient energy. The only en-
ergy source available for your SLING mini is the push you give her when
launched; during the rest of her flight she has to trade her altitude for
speed – gain enough energy in a dive and you can do a loop! If the climb
angle is too great, or the energy available insufficient, your model will
lose flying speed until the minimum (stall) speed. At the stalling speed
(when the airflow starts to break away from the upper surface of the
wing), your model will start to feel as though it is not responding as nor-
mal to control inputs, and then drop with little warning – apply down
elevator to regain flying speed and full normal control.
Rudder control of a model without ailerons controls the angle of bank,
which then controls the rate of turn. Natural stability of your model keeps
the wings level in normal straight flight. Any turn requires an appropriate
bank angle – SLING mini will fly nice big and safe flat turns with only a
small angle of bank. During initial flights never use a bank angle of great-
er than 45 degrees. By planning the direction that the model will take,
normal turns will be made with less than 30 degrees of bank.
Move the rudder to the left a little way, and your model will bank into a
gentle turn. Increase the rudder input a little more, and your model will
continue turning to the left, but it will also start to descend (this is a good
time to move the control stick to the centre to allow your model to recover
from the dive!).
Coordinated left turn (180°)
Straight and level flight
Straight and level flight
Rudder and Elevator movement
Rudder
Elevator
Why does your model descend when only rudder is applied? Once the rud-
der leaves its exactly vertical position it also starts to work as an elevator
turned down telling your model to dive. When in a banked turn to main-
tain level flight it is necessary to apply a little up elevator to counter the
effect of the down turned rudder. (Actually, the reason why your model
descends in the bank is more complex - the wing gives less lift in the
bank as the vertical projection of the wing is the area that counts and you
also have to beat the inertia that tries to keep your model in the straight
flight.) The elevator applied when your model is in a banked turn also
works like a rudder - fortunately it helps to maintain the turn!
In practise, the rudder is used to set and maintain the desired bank angle,
and elevator input helps to control height whilst also increasing the rate
of turn. We have got through about 3/4 of the turn and it is the time to
think about returning to straight and level flight in the desired direction.
Return the controls to the middle position (you may need to correct the
turn with a little right rudder). If necessary give slight elevator input to
settle your model into a straight and level flight.
If you take a look at our drawing above you will notice that it takes some
time until the model actually starts to turn. And, when leaving the turn,
you have to start to apply the opposite rudder sooner than the nose of
your model is pointing to the desired final direction. The elevator and
rudder deflections between B and C points are marked with dotted lines
– this is because you cannot tell exactly the track that the model will take
during a gentle banked turn or entry to straight and level flight.
Congratulations! You have learnt how to achieve a coordinated turn us-
ing rudder and elevator. Remember that model aircraft control is about
guiding your model in the desired direction rather than precise steering.
Another complication is the rudder control. It is easy and natural while
the model is flying away from you, but when your model is flying toward
you the direction of control commands has to be reversed. A simple trick
when the model is flying towards you is to move the control stick towards
the wing that you want to lift, imagine supporting the wing by moving
the stick under that wing – it works!
Final Setup
Now is the time for the final setup. Fly your SLING mini straight into wind;
leave the controls in the neutral position. If the model turns in one direc-
tion apply the rudder trim in the opposite direction until SLING mini flies
straight. Your model must settle into a gentle glide, not too fast so that
it plummets to the ground, and not so slow that the controls feel "soggy"
and the model is on the edge of the stall. Apply the elevator trim in the
Resume level flight
way to solve any problem.
Step 3: Landing
When the power available starts to reduce check that you landing field
Maintain
is clear of people and other obstructions. Position your model about
constant bank
3-5 m off the ground at the down wind end of your field. Make the final
and altitude
approach into wind, keeping the wings level all the time as your model
descends slowly, and finally settles gently onto the ground. With more
practice you will be able to use a little up elevator to "round out" (slow
down the model) at less than 0.5 m off the ground.
Bank left
Step 4: Discus Launch
The discus launch allows your model reaching quite high altitude without
Left
much effort. As it is with any "sport performance", it will require some
Right
training in order to do it right – our step by step manual makes it easy.
Up
We will describe the procedure for a right-handed pilot; with the launch-
Down
ing pin attached to the left wingtip. The "left-handed" procedure is the
mirror image.
Position A - Getting Ready:
Your right index finger and mid-
dle finger should be wrapped
around the launch pin at the left
wing tip. Your thumb is to be gen-
tly pressed against the leading
edge of the wing.
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