This vibration is a result of the airframe rolling with the mass effect caused by the unequal vertical lift component. The term “rotor track and balance” is somewhat misleading, in that “track” or “tracking” refers to adjusting the blade tip paths to make them fly in the same rotational plane.
How does a helicopter balance?
As the rotors spin with great force, it affects the stability of the entire helicopter and causes it to want to spin in the opposite direction. For this reason, a second large rotor or tail rotor is added to the helicopter that serves as a counter balance.
What is Blade tracking?
Blade track is the ability of one blade to follow the other in the same plane of rotation. If your propeller has been bumped or compromised, check the tracking. A change in tracking can be unnoticeable or cause severe vibrations.
What normally causes a low-frequency helicopter vibration?
Low-frequency vibrations are often caused by disturbances in rotor revolution, while medium-frequency vibrations can typically be attributed to loose components that affect the rotor system.
What is the spinning thing on a helicopter?
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.
Why is a helicopter hovering over my house?
While military helicopters may fly over houses for training, law enforcement helicopters fly over residential properties for a variety of reasons. Police departments in many cities have helicopters that are dispatched to assist officers on the ground.
How do helicopters go forward?
Only the main rotor is used to move the helicopter up and down, and to make the helicopter tilt forward, backward, left, or right. … By tilting a blade to increase the blade’s angle of attack, the pilot can increase the force of lift that is pushing up on that blade.
What is propeller tracking?
Propeller blade tracking. Blade Tracking. Blade tracking is the process of determining the positions of the tips of the propeller blades relative to each other (blades rotating in the same plane of rotation). Tracking shows only the relative position of the blades, not their actual path.
How does a helicopter main rotor work?
Unlike airplanes, helicopters feature spinning wings called blades or rotors on top. As a helicopter’s blades spin, they create a force called lift that allows the helicopter to rise into the air. … The rear rotor can face different directions, allowing the helicopter to move forward, backward, and sideways.
What is rotor track and balance?
Rotor track and balance is the process of smoothing vibrations in the airframe, which are caused by the main rotor. … A helicopter main rotor is capable of producing vibrations in both the vertical and lateral planes. A vertical vibration is a result of unequal lift produced by the main rotor blades.
What are the two types of engines that can power a helicopter?
The two most common types of engines used in helicopters are the reciprocating engine and the turbine engine. Reciprocating engines, also called piston engines, are generally used in smaller helicopters. Most training helicopters use reciprocating engines because they are relatively simple and inexpensive to operate.
What happens when a helicopter tail rotor fails?
If the tail rotor fails in flight, engine torque can no longer be countered by the tail rotor, and uncontrolled spinning of the aircraft is a possibility. Most manufacturers call for an immediate autorotation. Some call for a running landing, instead.
What happens when a helicopter stalls?
The more insidious condition is the rpm stall. Essentially the rotor rotation slows down enough that the blades can now longer support the helicopter’s weight and it simply falls out of the sky. … Lowering the nose won’t do anything in the helicopter, but lowering the collective will.
How high can a helicopter fly?
Turbine-engined helicopters can reach around 25,000 feet. But the maximum height at which a helicopter can hover is much lower – a high performance helicopter like the Agusta A109E can hover at 10,400 feet.
How much is a helicopter?
How Much Is a Helicopter?
|1. Robinson R-22||$250,000|
|2. Robinson R-44 Raven I||$340,000|
|3. Robinson R-44 Raven II||$415,000|
|4. Bell B206 JetRanger||$700,000|
How fast is a helicopter?
As a general rule, most helicopters fly at an average speed of around 140 knots. This equals to about 160 mph or 260 km/h. The helicopter’s average speed is affected by many things including the size of the chopper and what or who is on board at the time.