GAUI Hurricane 425 Operating Instructions Manual page 35

Page P.9
Upper figure:
Push the rotor shaft adjustment ring onto the rotor shaft from below and install the rotor shaft pinion in the mechanics
together with the spacer disc 8x13x2 (see page P.8, item 10). Then push the rotor shaft into the mechanics from above.
After connecting the rotor shaft to rotor shaft pinion with the screw M3x18, pull the rotor shaft upwards and push the
adjustment ring down. Then secure the collar with two grub screws M3x3. The rotor shaft must not have any vertical play
in the mechanics.
After this, hook the two pre-assembled swash disc linkage rods (see sketch at the upper right).
Lower figure:
Install the tail rotor casing and the pre-assembled tail rotor shaft according to the indicated sketches. Observe the different
screw lengths.
Important!
Put the tooth belt into the tailboom perfectly straight and not twisted. Use a piece of stiff wire or a narrow wooden
bar for this. The pin at the tail rotor casing must interlock with the bore at the tailboom (see fig. 5).
Page P.10
The tail rotor, as well as the sliding sleeve, is already pre-assembled ex works. Only the linkage ball must be installed to the
slider sleeve.
Connect the slider sleeve to the tail rotor according to the sketch and push the unit onto the tail rotor shaft. Observe that the
two grub screws M3x3 catch in the respective outer indentations of the tail rotor shaft (see fig. 4).
Then screw on the reversing lever. Using a second washer makes it possible to increase the distance between the linkage
rod and the tail rotor casing to ensure that the lever does not drag at the casing.
Installation of the tail rotor blades and placement of the tailboom support complete the work. Observe that the tailboom
support has the guide bodes for the tail rotor linkage on the right side in flight direction.
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.
Page P.11
Upper figure:
Looking at the tailboom from the front, turn the drive belt clockwise by 90°. Push the tailboom carefully back into the
mechanics. After placing the belt on the front drive wheel, draw back the tailboom again. Observe correct belt tension.
Tension the belt only enough for the entire tail rotor drive to still work smoothly.
When the tailboom fits perfectly and the rudder is vertically aligned, tighten the four chassis screws above and below the
tailboom receptacle.
Lower figure:
Verify correct assembly of the tailboom drive belt. The correct rotational directions of the main and tail rotors are indicated
in the sketch. When everything has been installed correctly, attach the elevator and the tailboom supports.
Finally, screw the rotor blades to the blade holders. Insert a washer above and below.
Important!
Tighten the retention screws for the rotor blades only enough for the rotor blades to still automatically align at a
180° to each other in flight.
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