MAIN ROTOR – GENERAL
The rotors provide for lift and thrust necessary for flight and include:
• the Main Rotor (MR);
• the Tail Rotor (TR).
The Main Rotor (MR) provides for aircraft lift and forward flight. The MR
comprises:
• the main rotor head;
• the blades;
• the rotating controls and swashplate assembly.
The main rotor is a fully articulated type rotor with 5 blades.
MAIN ROTOR - MAIN COMPONENTS
MAIN ROTOR HEAD
The main rotor head is driven by the main rotor shaft and includes the hub,
the tension links, the elastomeric bearings, the dampers, the control levers
and the beanie.
HUB
The hub connects the blades to the MR shaft. It is made by titanium and
splined internally to fit the MR shaft. The hub transmits the rotation to the
swashplate via the scissors links.
TENSION LINKS
The tension links connect the blades to the hub and transmit centrifugal
forces from the blades to the hub through elastomeric bearings.
ELASTOMERIC BEARINGS
The elastomeric bearings allow a fully articulation of the blades around the
flap, pitch and lag axis. They are made by rubber and metallic disks.
DAMPERS
The hydraulic dampers react to lead lag motion and provide also the stops.
A separated stop system is provided for flapping: it includes the upper stop
and the lower stop. The first is provided with a support (for flight) and a
limiter (for ground); the second is made by a bracket with a sliding ring at
one end.
The pitch control levers provide the connection points between the MR head
and the swashplate assembly. They transmit flight control input to the
blades.
BEANIE
An aerodynamic beanie is bolded to the top of the MR head.