What is the damper assembly helicopter?
The damper consists of a series of damping plates, each plate being connected to one of the rotor blades. The damping plates are separated from each other and from the damper housing by elastomeric layers bonded to the plates and to the housing. Lead-lag damping is provided by the shear in the elastomeric layers.
What does a damper do on a helicopter?
Our Lead-Lag Dampers are installed on helicopter rotor heads either between the hub and the blade or between two consecutives blades. They’re essential rotor components that ensure dynamic stability of the aircraft under all operating conditions.
Can you land with yaw damper on?
Restrictions On Yaw Damper Use While the yaw damper can be engaged separately of the autopilot, in most airplanes the yaw damper is prohibited from being engaged during takeoff or landing.
How do you stop a helicopter from vibrating?
Rotor Track and Balance to Reduce Helicopter Vibration The wear and tear they experience can cause the rotor to become unbalanced. Rotor Blade Track and Balancing helps reduce vibration caused by rotational movement.
What is a swash plate on a helicopter?
A swashplate is a device that is used to transmit the pilot’s commands from the non-rotating fuselage to the rotating rotor hub and blades. The fact that the rotor blades are rotating at a very high speed makes the swashplate mechanism’s task more challenging.
How wide are helicopter blades?
Minimum width with all blades 35.1 ft.
What is damping rotor?
The internal damping is caused by the tangential force when stress center line and strain center line of rotor cross-section are no longer coincide. If external damping is insufficient to overcome the self-excited vibration caused by internal damping, the rotor system may become instable.
What causes Dutch roll in aircraft?
Answer: Dutch roll is a natural aerodynamic phenomenon in swept-wing aircraft. It is caused by the design having slightly weaker directional stability than lateral stability. The result is the tail of the airplane seeming to “wag” or move left and right with slight up and down motion.
What is helicopter Blade tracking?
The purpose of blade tracking is to bring the tips of all blades to the same tip path throughout their entire cycle of rotation. If the blades are out of balance, they will cause a vibration or beat frequency that is transmitted into the rotor head, transmission and airframe.
Why is it called a swash plate?
ETYMOLOGY OF THE WORD SWASH PLATE From swash (obsolete n) an oblique figure or ornament, from aswash: see swash letter. Etymology is the study of the origin of words and their changes in structure and significance.
What is a lead lag damper for a helicopter?
Thus it can be seen that this invention provides a single unit, mechanically simple lead-lag damper for all the blades of a helicopter rotor which can be installed in a hollow rotor shaft and will provide a smaller frontal area thus insuring less aerodynamic drag.
What is a rotor damper assembly?
a damper assembly assembled in the central opening of said rotor shaft for providing damping in the lead-lag direction, said damper comprising; a damper housing assembled in said rotor shaft and centered on the rotor axis said housing being a hollow structure having upper and lower walls;
How is the damper attached to the air frame?
The damper may be fastened to the air frame in a conventional manner, it may be mounted on a spindle for rotation about the rotor axis independent of rotor shaft rotation or may be free-floating and attached only to the rotor blades and not to the rotor shaft.
Why do helicopter rotor blades have dampers?
In modern helicopters, the rotor blades are articulated to provide motion for blade pitch, flap and lead lag motion. Dampers are required in this lead lag motion in order to prevent air and/or ground resonance problems.