ROTATING CONTROLS AND SWASHPLATE ASSEMBLY
The main rotor interfaces the flight control system via the rotating controls
and swashplate assembly. The rotating controls and swashplate assembly
provides the attachment points for the three MR servo actuators and
transmits the flight controls output coming to the blades.
The rotating controls include:
• five pitch links, one for each blade, connecting the pitch control levers
of the MR blades to the swashplate;
• two rotating scissors assemblies installed between the MR hub and the
rotating swashplate connecting the hub (scissors attachment flange) to
the rotating swashplate and keeping it rotating. Each assembly is
composed of an upper lever and a lower lever hinged to the
swashplate through a ball bearing;
• two adapters installed between the MR head and the swashplate. A
swashplate boot is attached to the top and bottom adapters with
metallic clamps;
• the swashplate assembly installed on the top of the MGB between the
MR head and the three MR servo-actuators and composed by rotating
and stationary stars. The relative rotation is allowed by a double raw of
ball bearing. The stationary star receives the control input from the MR
servo-actuators (fixed controls) and transmits it to the rotating star. To
do this the swashplate is tilted with respect to the axis of a central pivot
element.