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The tail gearbox, mounted at the top of the tail pylon, supports and drives the rotary rudder. It reduces shaft speed (typical gear ratio around 3:1) and changes the direction of drive by 90°. It also enables pitch changes of the tail rotor blades through the flight control system. Lubrication is by means of an oil splash/mist method that is ...
Tail rotor blades can be made with both symmetrical and asymmetrical airfoil construction. The pitch change mechanism uses a cable control system or control tubes that run from the anti-torque pedals in the cockpit to a mechanism mounted on the tail rotor gearbox. In larger helicopters, the pitch change mechanism is augmented by a hydraulic ...
The 206-011-819 yoke assembly of the hub is made with a 4° twist for each blade. The twist in the yoke provides additional thrust for high altitude performance. Balancing of tail rotor blades is made possible by adding or removing balancing hardware that is attached to the balance wheel or the blade mount bolts. 64-2.
- What Is A Helicopter Anti-Torque System?
- Types of Helicopter Anti-Torque Systems
- The Fenestron System
- To Finish
Before we jump into the types of tail rotor systems I wanted to quickly explain what the tail rotor system is actually for as this will help you understand each type of system better. A tail rotor system is designed to stop the helicopter from spinning around when it lifts off the ground. As the engine drives the main rotor in one direction, the fu...
Now we know what the role of a tail rotor system is, let’s look at some of the incredible pieces of engineering that prevent today’s helicopters from spinning around! There are four main types of helicopter Anti-Torque system: 1. Bladed Tail Rotor 2. Fenestron Tail Rotor 3. NOTAR 4. No System
The Fenestron is a Trademarked Anti-Torque system used on many Eurocopter, now Airbus Helicopters. This anti-torque system works by placing a multi-bladed fan within a duct in the tail of the helicopter. The duct is integrated into the tail boom and is usually made of a fiberglass skin. The fan consists of between 8-18 blades, depending on the airc...
No matter what type of helicopter is flying they all need some form of anti-torque system to prevent the fuselage from spinning around. The mechanical genius’ that have created the technical wonders you have just read about really do give helicopter operators a vast choice of systems to pick from. When flying in the bush I am always ‘Flying The Tai...
Operation. The tail rotor gearbox is a single-stage reduction, single-input drive gearbox and transmits continuous power from the driveshaft segments of the tail rotor driveshaft to the tail rotor hub assembly through its input quill and output shaft. It also reduces the rotational speed to 2472 RPM (104% N2) at the output for the tail rotor ...
The transmission system transfers power from the engine to the main rotor, tail rotor, and other accessories during normal flight conditions. The main components of the transmission system are the main rotor transmission, tail rotor drive system, clutch, and freewheeling unit. The freewheeling unit, or autorotative clutch, allows the main rotor ...
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What is a tail rotor case Assembly?
The yoke of the tail rotor hub assembly is made from an aluminum alloy casting. It has a 4° twist angle where each blade attaches to give additional thrust for high altitude performance. Inside the yoke, a splined trunnion made of steel provides for attachment of the tail rotor hub assembly to the output shaft of the tail rotor gearbox.
