How does torque affect a helicopter?
How does torque affect a helicopter?
With a single main rotor helicopter, a torque effect is created as the engine turns the rotor. This torque causes the body of the helicopter to turn in the opposite direction of the rotor (Newton’s Third Law: Every action has an equal and opposite reaction, as explained in Chapter 2, Aerodynamics of Flight).
How much torque does a helicopter need?
Normally, larger helicopters use a higher percent of engine power to counteract torque than do smaller aircraft. A helicopter with 9,500 horsepower might require 1,200 horsepower to drive the tail rotor, while a 200 horsepower aircraft might require only 10 horsepower for torque correction.
What is transient torque in a helicopter?
Transient torque is a phenomenon that occurs in single rotor helicopters when lateral cyclic is. applied. Transient torque is caused by aerodynamic forces acting on the rotor. At the rear half of the. rotor disk, downwash is greater than that seen at the forward half of the rotor disk.
What is the importance of anti-torque system in helicopter?
These blades are called a tail rotor or anti-torque rotor, and their purpose is to create a force (thrust) that acts in the opposite direction of the way the helicopter is trying to rotate.
What are the effects of torque?
Just as force is what causes an object to accelerate in linear kinematics, torque is what causes an object to acquire angular acceleration. Torque is a vector quantity. The direction of the torque vector depends on the direction of the force on the axis.
How much horsepower does a helicopter need?
For transport helicopter, cruising velocity is between velocity for maximum range and maximum velocity. The minimum continuous power to achieve desired maximum velocity is around 180 hp (134kW). From Figure 6, it can be seen that the power required at sea level is slightly lower than other altitude at lower speed.
What is the max elevation for a helicopter?
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 power does a helicopter need hover?
What is hovering in a helicopter?
Hovering is when the helicopter is flown so that it maintains a constant position over the ground. It is the main capability which differentiates helicopters from airplanes.
What are the 4 types of helicopter vibration?
Vibrations in Helicopter identified on the basis of there frequency. They are designated as extremely low, low, medium, and high. Extremely Low Frequency Vibrations: – Frequency of these vibrations is less than 1/rev. Commonly occured in main rotor.
What is better to have torque or horsepower?
Torque, simply, is the ability of a vehicle to perform work — specifically, the twisting force applied by the crankshaft. Horsepower is how rapidly the vehicle can perform that work. Because there is generally a limit on how fast you can spin an engine, having higher torque allows for greater horsepower at lower rpms.
Where does torque happen in the body?
Where do torques occur within the human body? The product of muscle tension and muscle moment arm produces a torque at the joint crossed by the muscle.
How does the torque of a helicopter work?
Torque results from the rotor being driven by the engine power output. Any change in engine power output brings about a corresponding change in torque effect. Furthermore, power varies with the flight maneuver and results in a variable torque effect that must be continually corrected.
Can You Fly a helicopter with a turbine?
Obviously you can already fly a helicopter if you have a rating. The “cycle out” issue in turbines only applies to the hot section of the engine, nothing else. The torque issue with turbines is that the engines often put out much more power than other components are designed to withstand.
Can a helicopter sit in a stable hover?
A helicopter sitting in a stable hover is one of the worlds modern technological wonders and when I was learning to master it many, many years ago I can tell you that it made me sweat! Not only is it difficult to learn but the design and technology behind this marvel are truly staggering!
Why does a helicopter have so much drag?
As the Pitch Angle on a helicopter airfoil/rotor blade increases, the Drag it creates also increases. This drag will try to slow down the rotational speed of the rotor blade and to maintain the helicopter rotor system at the desired RPM, the engine/s also increase power to overcome the drag.
