Assembling The Model - GRAUPNER Micro Star 400 Manual

Micro Star 400 v2

1. Assembling the model

The main mechanical system of the Micro Star 400 consists primarily of glass fibre reinforced
nylon, a material which offers important advantages for use in model helicopters over alterna-
tives such as aluminium, including high mass constancy combined with low weight, freedom
from fatigue effects, low-noise operation, and the ability to absorb vibration in the power train.
Since the model is supplied completely factory-assembled, completing it ready to fly simply in-
volves installing the radio control system components and the flight battery.
However, please note that you should check that all the parts have been assembled correctly by
comparing them with the instructions; the final adjustment of the gearbox and linkages must
also be carried out by the modeller himself.
Important:
Before you carry out any other work on the model, it is essential to check that the power system
operates smoothly and freely.
Shaft drive:
Loosen the screws which clamp the tail rotor housing to the tail boom and adjust the position of
the tail rotor unit until there is barely detectable meshing clearance between the bevel gears on
the drive shaft and the tail rotor shaft. Re-tighten the clamping screws and ensure that the tail
rotor shaft is exactly horizontal.
Now loosen the clamping screws which fix the front of the tail boom to the chassis. Adjust the
position of the tail boom until there is just perceptible meshing clearance between the crown
gear of the tail rotor drive gear and the motor pinion, then re-tighten the clamping screws.
Finally, loosen the motor retaining screws and tighten them again, so that the motor takes up
the optimum position between the main gear and the tail rotor drive system.
Belt drive:
Check that the toothed belt is under tension, but still works smoothly and easily.
1.1 Installing the radio control system components
The arrangement of the radio control system components is shown in the illustration: The
servos are fixed to the chassis as shown in the drawing, using the screws supplied with them.
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