GRAUPNER JetCat 6810, Руководство пользователя

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Helicopter mechanics
with model turbine engine
18
The 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 (you may have to disconnect the ball-links on the
outer ring to make this possible). The swashplate should then rest exactly against the collective
pitch compensator when the compensator itself rests against the underside of the main rotor
head. If this is not the case, you must adjust the angled pushrods 4618.150 as follows:
•
The swashplate contacts the collective pitch compensator, but there is a gap between the
collective pitch compensator and the rotor head there: shorten both pushrods.
•
The collective pitch compensator contacts the rotor head, but there is a gap between the
swashplate and the collective pitch compensator: lengthen both pushrods.
Note that it is essential to adjust both pushrods by the same amount, i.e. they must remain the
same length.
The final step is to carry out the fine adjustment of the auxiliary rotor, to ensure that the Hiller
paddles are exactly parallel to the swashplate when the swashplate is set horizontal. If you need
to make adjustments here, rotate the pushrods 4618.150 in opposite directions by the same
amount; don’t adjust only one pushrod!
The pitch range of the rotor blades depends amongst other things on the position of the linkage
balls to which the double ball-links (between the flybar and the mixer levers on the blade
holders) are fitted: fitting the balls in the inner holes sets the standard range, but fitting them in
the outer holes expands the collective pitch range by about 4.5°.
When you are setting up the collective pitch travels ensure that the two guide pins in the
main rotor head still engage securely in the collective pitch compensator at the minimum
collective pitch position (lowest position of the swashplate), otherwise the model may
become uncontrollable in flight.