Pre-Flight Checks; Maintenance; Fitting The Starter Adaptor - GRAUPNER Jet Ranger Handbuch

3. Pre-flight checks

When you have completed the model, run through the final checks listed below before carrying
out the helicopter's first flight:
Study the manual once more, and ensure that all the steps of assembly have been carried
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out correctly.
Check that all the screws in the ball-links and brackets are tightened fully after you have
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adjusted gear meshing clearance.
Can all the servos move freely, without mechanical obstruction at any point? Do they all
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rotate in the correct direction? Are the servo output arm retaining screws in place and tight?
Check the direction of effect of the gyro system.
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Ensure that the transmitter and receiver batteries are fully charged. We recommend using a
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voltage monitor module (e.g. Order No. 3138) to check the state of the receiver battery
when you are at the flying field.
Don't attempt to start the motor and fly the helicopter until you have successfully checked
everything as described above.
Bear in mind that the running qualities of your motor will vary widely 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 starter adaptor

The starter adaptor supplied with the mechanics consists of three parts which have to be fitted
to your electric starter as shown in the drawing below. First insert the pin 4450.5C through the
extension 4450..5B, then push the plastic adaptor 4450.5A on it, and engage the pin in the
channel of the adaptor. To mount the starter adaptor you first have to remove the rubber insert
holder from the starter. Push the starter adaptor onto the starter shaft until the cross-pin in the
shaft engages in the channel of the adaptor. Tighten the two grubscrews fully to secure the
adaptor.
Ensure that the adaptor runs „true", i.e. does not wobble from side to side.
To start the motor rotate the rotor head until the starter adaptor can be engaged in the cooling
fan, holding the starter vertical. Please note the following points:
Do not switch the starter on until you are sure that the teeth in the cooling fan are
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correctly engaged with the teeth on the adaptor.
When the motor is running, switch off the starter before withdrawing it.
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Jet Ranger