GAUI Hurricane 255 Operating Instructions Manual page 37

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Upper figure:
The top figure shows the schematic setup of the tail rotor and linkage. Since the tail rotor and linkage are already pre-
assembled ex works, no assembly steps are required in this section.
Important!
Tighten the screws for the tail rotor blades only enough for the rotor blades to still cleanly align at a 180° to each
other in flight.
Lower figure:
Screw the rudder to the tail rotor casing and place the holder for the elevator and the two tail servo holders onto the
tailboom according to the figure. Do not screw on the components yet!
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Upper figure:
The top figure shows the assembly or running direction of the tail rotor toothed belt. Always observe that the belt is only
installed in this manner, and not twisted.
Lower figure:
Push the tailboom carefully back into the mechanics. Observe that the derive belt is turned according to the upper sketch.
Insert the main pinion with the belt pulley into the mechanics from the side and place the toothed belt around the belt
pulley.
Put a little oil onto the rotor shaft and then push the rotor shaft into the mechanics from above together with the top
adjustment ring.
Once you have attached the bottom adjustment ring, pull the main rotor shaft upwards and screw on the upper adjustment
ring. The rotor shaft must not have any vertical play in the mechanics. Finally, the two grub screws M3 x 3 at the belt pulley
are tightened.
To set the tooth backlash, push a narrow paper strip between the motor pinion and the gear pinion, push the motor towards
the gear and screw the motor to the motor carrier. Then remove the paper strip again. If set correctly, the two pinions will
securely interlock without catching or without showing too much play.
To set the belt tension, carefully pull back the tailboom. Align the rudder perfectly vertically. Tension the belt only enough for
the entire tail rotor drive to still work smoothly. If the tail rotor is tuned manually, the drive motor must turn as well. Attach
the tailboom with the two screws M2 x 5.
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