Final Checks Before The First Flight; Maintenance; Fitting The Hexagon Starter Adaptor - GRAUPNER NH90 Bedienungsanleitung

3. Final checks before the first flight

When you have completed the model, run through the final checks listed below before the first
flight:
• Study the manual again and ensure that all the stages of assembly have been completed
correctly.
• Check that all the screws in the ball-links and brackets are tightened fully after you have
adjusted gear meshing clearance.
• Can all the servos move freely, without mechanical obstruction at any point? Do they all ro-
tate in the correct direction relative to the stick movements? Are the servo output arm re-
taining screws in place and tight?
• Check the direction of effect of the gyro system.
• Ensure that the transmitter and receiver batteries are fully charged. We recommend using a
voltage monitor module (e.g. Order No. 3157) to check the state of charge of the receiver
battery on the flying field.
Don't attempt to start the motor and fly the helicopter until you have successfully checked eve-
rything as described above.
Bear in mind that the running qualities of your motor will vary greatly according to the fuel in
use, the glowplug, the height of your flying site above sea level and atmospheric conditions.
Please read the notes on motor set-up which you will find later in this manual.

4. Maintenance

Helicopters, whether large or small, place considerable demands on maintenance. Whenever
you notice vibration in your model, take immediate steps to reduce or eliminate it. Rotating
parts, important screwed joints, control linkages and linkage junctions should be checked before
every flight. If repairs become necessary be sure to use original replacement parts exclusively.
Never attempt to repair damaged rotor blades; replace them with new ones.

5. Fitting the hexagon starter adaptor

Your electric starter must be fitted with a hexagon starter adaptor with freewheel (available
separately - Order No. 1621), following the instructions supplied with it.
To start the motor rotate the rotor head until you can engage the starter adaptor vertically in the
hexagon starter cone in the cooling fan. Please note the following points:
• • • • Do not switch the starter on until you are sure that the hexagon on the starter adaptor
is fully engaged with the hexagon socket in the starter cone.
When the motor has started, switch off the starter before withdrawing it.
• • • •
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NH90