Aviation

Boeing Starliner Completes First Orbital Flight Test with Successful Landing

WHITE SANDS MISSILE RANGE, N.M., Dec. 22, 2019 /PRNewswire/ — The Boeing [NYSE: BA] CST-100 Starliner’s first mission ended historically today when it became the first American orbital space capsule to land on American soil rather than in an ocean.

The spacecraft’s crew module landed at the U.S. Army’s White Sands Missile Range at 5:48 a.m. Mountain time, after spending just over two days on orbit and checking off a number of flight test objectives. The last time a spacecraft landed at the historic White Sands Space Harbor runway was in 1982, when Space Shuttle Columbia touched down, ending its STS-3 mission.

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Shortly after its December 20 launch and separation from its booster rocket, Starliner experienced a mission timing anomaly that made it use too much fuel to reach the intended destination of the International Space Station. Flight controllers were able to address the issue and put Starliner into a lower, stable orbit. The vehicle demonstrated key systems and capabilities before being signaled to return to Earth.

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“The Starliner team’s quick recovery and ability to achieve many mission objectives – including safe deorbit, re-entry and landing – is a testament to the people of Boeing who have dedicated years of their lives working toward the achievement of commercial human spaceflight,” said John Mulholland, vice president and program manager of Boeing’s Commercial Crew Program. “Their professionalism and collaboration with our NASA customer in challenging conditions allowed us to make the most of this mission.”

The Starliner landing demonstrated the robustness of its landing systems, including its innovative parachutes and airbags.

Although this Starliner carried no people, it did have a passenger. An anthropometric test device, named “Rosie,” was in the commander’s seat for the entire mission. She was outfitted with about a dozen sensors that collected data to help prove Starliner is safe for future human crews.

Next, this crew module will be returned to Florida for data retrieval, analysis and refurbishment for future missions. It is the vehicle chosen to fly NASA astronauts Sunita “Suni” Williams and Josh Cassada, along with two international partner astronauts, on the first operational mission. In parallel, Boeing’s Starliner team is finalizing the vehicle that will fly Boeing astronaut Chris Ferguson and NASA astronauts Mike Fincke and Nicole Mann on the Crewed Flight Test.

For more about Starliner, visit www.boeing.com/starliner. Follow us on Twitter: @BoeingSpace.

Aviation

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.

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.

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.

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.