GRAUPNER GmbH & Co. KG D-73230 KIRCHHEIM/TECK GERMANY
26
Keine Haftung für Druckfehler. Technische Änderungen vorbehalten! ID# 0060046
01/2009
16. The speed controller wires can now be soldered to the motor; check carefully that the
propeller shaft spins in the correct direction before doing this. Fit the retaining screws
(27) through the motor’s mounting lugs, then push the rubber grommets (28) over the
threaded shanks. The motor is now ready to be screwed to the motor mounts. The speed
controller should be glued to the lower fuselage reinforcement using UHU-por
17. Glue the motor mounts (29) in the appropriate slots in the fuselage using UHU-por, then
screw the motor to them. Stick the speed controller to the underside of the fuselage using
UHU-por.
18. Actuating the control surfaces with long servo output arms and actuating thread (30).
The
procedure is always the same, regardless of the length of thread involved.
Note
that the three inner holes in the servo output arm must be drilled out using a 1 mm Ø bit
to accept the tensioner (31); this must be done before the servos are glued in place. A
notch is also required in the servo output arm to permit the tensioner to be rotated
through a quarter-turn; the notch should be positioned to suit the direction of winding
(right or left). Insert the tensioner in the holes; the servos can now be glued in the
appropriate position.
19. Glue the servos to the wing and the fuselage using UHU-por.
Ensure that the servos
are at their neutral position; check this by connecting the RC system and
switching the transmitter on briefly.
20. Connect the servos and the speed controller to the receiver, as described in the
instructions supplied with the receiver. Stick the receiver to the fuselage using UHU-por.
21. Run the actuating thread (30) through the first hole and clamp it in the slit. Repeat this
procedure once.
Leave the thread slack at this point.
Route the thread through the
outer hole in the servo output arm, then through the hole in the tensioner. Turn the model
over and run the thread through the outer hole on the other side, running in the direction
of the horn. Now proceed as described in the first section.
The thread must be
tensioned before you pull it into the slit on the opposite site: this is accomplished
simply by pulling the thread until it is just taut.
Now you can pull the thread into the
slit to clamp it. If the thread should work loose over time, this system enables you to
adjust the tension very easily. Switch the RC system on briefly and set the servos to
neutral (centre). Move the control surface to centre, and fix the actuating thread to the
hole in the tensioner with a drop of cyano.
22. The wheel axles (32) can now be glued in the axle supports: apply a small drop of thick
cyano to the hole in the wheel axle support, then push the axle into the hole.
Ensure that
the wheel axles are positioned parallel to the ground.
23. Glue the wheel spat supports (33) to the wheel spats (34) using UHU-por.
Take care to
produce a handed pair (different left and right).
24. Fit the wheels (35) on the wheel axles, then slip the wheel spats and supports on the
axles.
Setting up the model
•
Control surface travels (for the first few flights it is sensible to limit the control surface
travels to about 60% of the values stated below. Do this using Dual Rates, and assign
D/R switches if required):
Elevator 50 mm up, 50 mm down
Rudder 50 mm right, 50 mm left
Aileron 45 mm up, 45 mm down
•
Centre of Gravity position: about 75 mm from the wing root leading edge.
•
First flight:
charge the batteries and check all the model’s working systems. Carry out a
range check. Wait for a day with as little breeze as possible (flat calm is ideal). Now you
are ready for the model’s first flight. Ask an experienced launcher to give the Yak a gentle
hand-launch. The motor has plenty of power, so the model does not need a powerful
launch. Adjust the trims if necessary, and take your time to get to know the aeroplane’s
handling characteristics before attempting the first aerobatic manoeuvres.
