Contents
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 are the parts of a helicopter?
The major components of a helicopter are the airframe, fuselage, landing gear, powerplant, transmission, main rotor system, and tail rotor system.
What are the things on the bottom of a helicopter?
Landing gear comes in different forms but skids and wheels are the most common. Bear paws, floats and pontoons are also fairly common. Bear paws are attached to the skids and used for helicopters landing off airport on uneven, unstable and soft terrain helping with overall stability.
What is the main rotor system of the helicopter?
Main Rotor System The rotor system is the rotating part of a helicopter which generates lift. The rotor consists of a mast, hub, and rotor blades. The mast is a hollow cylindrical metal shaft which extends upwards from and is driven and sometimes supported by the transmission.
Which rotor has stabilizer bar?
Flybar (stabilizer bar) The flybar has a weight or paddle (or both for added stability on smaller helicopters) at each end to maintain a constant plane of rotation.
How does a helicopter stabilizer bar work?
The double acting lever is attached by a control tube to the stabilizer bar frame. As the bar is displaced during operation the cam displaces the pin. Movement of the pin and damper timing (5 ± 1 second ) determines stiffness (viscous) of action, therefore, the degree of stability the bar affords the helicopter.
What is the collective on a helicopter?
The collective pitch control (or simply “collective” or “thrust lever”) is located on the left side of the pilot’s seat and is operated with the left hand. The collective is used to make changes to the pitch angle of the main rotor blades and does this simultaneously, or collectively, as the name implies.
Why do helicopters need two pilots?
Safety should always be at the forefront of every flight and the addition of a second pilot dramatically increases the safety factor on a flight. If one pilot were to have a catastrophic medical issue at any point during the flight, the second pilot is there to take control and continue safely.
What is the spinning thing on a helicopter called?
A helicopter’s rotor blades are spinning wings. A helicopter moves air over its rotor by spinning the blades. The rotor makes the lift that carries the helicopter up.
Can a helicopter fly without a tail rotor?
One significant advancement in the last decade has been the no-tail rotor, or NOTAR, helicopter. As you now know, vertical-lift flight is impossible without a tail rotor to counteract the torque produced by the main rotor. Unfortunately, the much-smaller tail rotor makes a lot of noise and is often easily damaged.
How does a pilot compensate for blowback?
The pilot uses cyclic feathering to compensate for dissymmetry of lift allowing him or her to control the attitude of the rotor disk. Figure 2-42. To compensate for blowback, move the cyclic forward. To develop a thrust force, the rotor system must be tilted in the desired direction of movement.
How do helicopters stay stabilized?
Stabilizer — The stabilizer bar sits above and across the main rotor blade. Its weight and rotation dampen unwanted vibrations in the main rotor, helping to stabilize the craft in all flight conditions. Arthur Young, the gent who designed the Bell 47 helicopter, is credited with inventing the stabilizer bar.
Why are Lord rotor dampers used in helicopters?
In a dynamically complex application like a rotorcraft (helicopter), LORD rotor dampers fulfill a critical vibration management function. Where are LORD Rotor Dampers Currently Used?
Where is the lead lag damper on a helicopter?
Lead-lag damping is provided by the shear in the elastomeric layers. 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.
How does the rotor assembly in a helicopter work?
Using this rotor design, a pilot can manipulate the swash plate assembly and control the helicopter’s motion. With the cyclic, the swash plate assembly can change the angle of the blades individually as they revolve. This allows the helicopter to move in any direction around a 360-degree circle, including forward, backward, left and right.
What kind of rotor blade does Sikorsky helicopter use?
Soon after, Sikorsky adopted the design for all their helicopters. The helicopters stabilizer makes heavy-lifting possible. The most common helicopter for heavy-lifting is the S-64 or Skycrane. The main rotor blade handles providing the lift to the helicopter.