Calidus
SYSTEM DESCRIPTION
AutoGyro_POH_Calidus Revision 4.0 – Issue Date 17.JAN.2019 7-10
View of Rotorhead III installed. Note the addition of a trim spring, which should be nearly
slack with the head against the rear pitch stops. Rotor head side plates are ’21.5mm’ for
Calidus.
7.9 Vibration Damping
A certain level of vibration is inherent to any 2-bladed rotor system. In order to reduce
vibration levels to a minimum, a vibration decoupling element (rubber bushes) in the rotor
mast isolates rotor vibration from the fuselage.
With rotorhead III the lower bush is replaced by a solid bushed bearing. The upper bush
remains rubber.
Rotor vibration damper
On early aircraft a single damper may be located between the rotor head and the mast to
dampen out any residual vibration between the rotor and the control stick. This is adjustable
by turning the lower adjustment knob anticlockwise for less or clockwise for more damping,
with 6 position notches. The position may be adjusted to suit the pilot requirements. A stiffer
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