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Cathay Pacific Group signs MOU for 32 A321neo aircraft

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Toulouse, 21st August 2017– Cathay Pacific Group has signed a Memorandum of Understanding (MOU) with Airbus for 32 A321neo single-aisle aircraft. The aircraft will be operated by Cathay Dragon, the regional carrier of the Group, on services linking its Hong Kong home base with destinations across Asia.

The new A321neo aircraft will replace and modernise Cathay Dragon’s current in-service fleet of 15 A320s and eight A321s, with the additional aircraft allowing the airline to capture growth opportunities in the region. The Cathay Dragon network currently covers 56 Asian destinations, including 28 in mainland China.

Cathay Pacific Chief Executive Officer and Cathay Dragon Chairman Rupert Hogg said: “The Airbus fleet has been serving Cathay Dragon well over the decades. With the A321neo we expect to benefit from a very significant increase in operating efficiency, while increasing capacity in the Cathay Dragon network in order to expand our reach to more customers.”

He added: “The intention to purchase these 32 environmentally-friendly aircraft will allow us to add new destinations to Cathay Dragon’s network, increase frequency on some of our most popular routes and expand our network in the region in order to provide more travel choices and convenience to our customers.”

John Leahy, Airbus Chief Operating Officer, Customers said: “Airbus is proud to have been selected to supply Cathay Dragon’s future single-aisle fleet. This is another major endorsement of the A321neo as the aircraft of choice in the middle-of-the-market segment.”

Airbus delivers its first aircraft produced in the USA.(Opens in a new browser tab)

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“The A321neo offers the lowest operating costs, longest range capability and most spacious cabin in its class. It will be the perfect aircraft for Cathay Dragon as it builds on its success as one of Asia’s leading regional carriers.”

Cathay Dragon is an all Airbus operator, with a current fleet of 23 A320 Family aircraft and 24 widebody A330-300s. In addition, Cathay Pacific operates 37 A330-300s, making the Group the largest A330 operator in the Asia-Pacific region. Cathay Pacific also operates the all-new long haul A350 XWB, with 17 A350-900s already in service. The carrier has another 31 A350 XWBs on order for future delivery, including the A350-900 and larger A350-1000.

The A321 is the largest member of the A320 Family and seats up to 240 passengers, depending on cabin configuration. Incorporating the latest engines, aerodynamic advances and cabin innovations, the A321neo offers a reduction in fuel consumption of up to 20 per cent per seat and can fly up to 4,000 nautical miles (7,400 kilometres) non-stop – further than any other single-aisle airliner.

The A320 Family is the world’s best-selling single-aisle product line and comprises four models (A318, A319, A320, A321) seating from 100 to 240 seats. To date, the Family has won over 13,200 orders and more than 7,700 aircraft have been delivered to some 400 customers and operators worldwide.

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Aviation

Exploring the Different Types of Helicopter Rotor Systems and the Science Behind Them

Exploring the Different Types of Helicopter Rotor Systems and the Science Behind Them

Helicopters are unique aircraft that use rotating blades, called rotors, to generate lift and enable flight. The design of these rotor systems is crucial because it affects how helicopters perform, maneuver, and respond to different flying conditions.

There are several types of helicopter rotor systems, each with its own advantages and specific uses. Understanding these systems helps us appreciate the engineering behind helicopters and their diverse capabilities, from search and rescue missions to military operations and aerial photography.

In this Video, we will explore the main types of helicopter rotor systems and how they contribute to the helicopter’s functionality and performance.

1. Single Rotor System

The single rotor system is characterized by a single main rotor blade that is responsible for generating lift. To counteract the torque produced by this rotor, a tail rotor is used. This setup is essential for maintaining directional control and stability during flight.

Uses: This design is prevalent in most conventional helicopters, including iconic models such as the Bell 206 and the Robinson R22. The simplicity of the single rotor system not only reduces mechanical complexity but also enhances efficiency. As a result, it is favored for a variety of applications, including aerial tours, law enforcement, and emergency medical services, where reliability and straightforward operation are paramount.

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2. Tandem Rotor System

The tandem rotor system features two parallel rotors of equal size that rotate in opposite directions. This counter-rotation helps to cancel out the torque that each rotor would otherwise produce, resulting in a balanced and stable flight profile.

Uses: This configuration is typically employed in heavy-lift helicopters, such as the CH-47 Chinook. The tandem design allows for an increased payload capacity and enhanced stability, making it particularly effective for transporting troops, equipment, and supplies in military operations, as well as for civilian applications like logging and construction, where heavy lifting is required.

3. Coaxial Rotor System

The coaxial rotor system consists of two rotors mounted one above the other on the same mast, rotating in opposite directions. This innovative design minimizes the need for a tail rotor, allowing for a more compact helicopter structure.

Uses: Coaxial rotor systems can be found in helicopters such as the Kamov Ka-50. This design offers several advantages, including enhanced lift capabilities, improved maneuverability, and better control in various flight conditions. These features make it particularly suitable for military applications, where agility and quick response times are crucial, as well as for specific civilian operations that require high performance in tight spaces.

4. Intermeshing Rotor System

The intermeshing rotor system consists of two rotors that rotate in opposite directions while intersecting each other, but without colliding. This unique configuration creates a highly efficient aerodynamic profile.

Uses: This system is utilized in helicopters like the Kaman K-MAX, designed specifically for heavy lifting and aerial work. The intermeshing rotors provide remarkable stability and lift capabilities, making it particularly effective for operations in confined spaces, such as urban environments or dense forests. It is ideal for missions that involve heavy external loads, including construction, firefighting, and disaster relief efforts.

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5. Transverse rotor system

The transverse rotor system has two parallel rotors that spin in opposite directions, improving lift and stability. This design enhances the aircraft’s aerodynamic efficiency and maneuverability.

A notable example of this system is the V-22 Osprey, a tiltrotor aircraft that merges helicopter vertical lift with the speed of a fixed-wing plane. allowing the Osprey to operate in tough environments like urban areas and remote locations. It can carry heavy loads and personnel, making it suitable for troop transport, search and rescue, medical evacuation, and logistical support in military operations. Overall, the transverse rotor system enhances the V-22 Osprey’s effectiveness and operational flexibility.

6. Compound Rotor System

The compound rotor system combines traditional rotor systems with fixed wings and other aerodynamic features to enhance efficiency and speed. This hybrid approach allows for greater aerodynamic performance than standard rotorcraft.

Uses: Advanced helicopters like the Sikorsky X2 and Boeing’s DBF (Defiant) utilize the compound rotor system. These helicopters are designed for higher speeds and longer ranges, making them suitable for military operations, search-and-rescue missions, and law enforcement tasks where rapid response and extended operational capabilities are essential.

7. NOTAR system

NOTAR system replaces the traditional tail rotor with a ducted fan and directional airflow to counter the torque from the main rotor. It works by pushing air through the tail boom and out through side vents, creating thrust that stabilizes the helicopter. This design reduces noise, boosts safety, and cuts down on maintenance.

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Uses: The NOTAR system is found in helicopters like the MD 520N and MD 902 Explorer. Without an exposed tail rotor, it lowers the risk of rotor strikes, making it safer for operations in tight spaces. Its quieter performance is ideal for missions where low noise is needed, such as urban air operations, police work, and medical evacuations.

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