GRAUPNER Skalar, Manual

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elektro
Skalar
25
3.4 Installing the main rotor head
Fit the main rotor head on the main rotor shaft.
Ensure that the hole in the rotor head lines up with the top cross-hole in the main rotor shaft,
then fit the special screw 4618.87 and tighten it firmly to retain the rotor head.
Connect the previously prepared pushrods 4618.150 and 4618.151 as shown in the drawing.
Note that the two arms of the mixer levers 4448.132 are of different length. The double ball-links
attached to the flybar must be pressed onto the longer arms of the levers; the short pushrods
run from the shorter inner arms to the swashplate.
The cranked pushrods 4618.150 now have to be adjusted to obtain the maximum possible
collective pitch range. This is the procedure:
Slide the swashplate up as far as it will go, disconnecting the ball-links on the outer ring if
necessary.
The swashplate should just make contact with the collective pitch compensator when the
compensator itself butts up against the bottom edge of the main rotor head.
If this is not the case, adjust the cranked pushrods as follows:
•
The swashplate strikes the collective pitch compensator, but there is clearance between the
collective pitch compensator and the rotor head: -> shorten both pushrods.
• The collective pitch compensator strikes the rotor head, but there is clearance between the
swashplate and the compensator: -> lengthen both pushrods.
In either case it is essential that you always alter both pushrods by exactly the same amount, so
that they remain the same length.
Now carry out the fine adjustment of the auxiliary rotor: the Hiller paddles must be parallel to the
swashplate when the swashplate is exactly horizontal. If necessary, carry out a correction by
adjusting the pushrods 4618.150 by the same amount; never adjust one pushrod on its own!