Counter Torque Device for Rotorcraft Sideward Flight
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Solution Overview
Problem
Rotorcraft face limitations in lateral movement capabilities due to the power constraints of traditional tail rotors or ducted fans, especially in strong crosswinds, which restrict their operational efficiency and stability during sideward flight.
Innovation Solution
The implementation of a plate or thrust fans on the fuselage, aligned with the longitudinal axis and positioned to provide additional counter torque, reduces the power demand of the tail rotor by utilizing airflow drag or active thrust to maintain heading control and stability during sideward flight.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a traditional tail rotor or ducted fan is used for yaw control, then the rotorcraft can maintain directional control, but the lateral movement capability is limited by the power constraints of the tail rotor
Solution Approach 1:
The invention divides the counter-torque function into two separate components: the tail rotor provides primary counter-torque for yaw control, while a newly introduced drag device (such as a plate or brake) provides additional counter-torque specifically during lateral movement. This segmentation allows each component to be optimized for its specific function, enabling the drag device to enhance lateral movement capability without increasing tail rotor power constraints.
Solution Approach 2:
The invention introduces an intermediary drag device (plate or brake) that acts as a mediator between the rotorcraft's lateral movement and the aerodynamic forces. This intermediary device converts a portion of the forward flight airflow into useful counter-torque, thereby enhancing lateral movement capability without requiring additional power from the tail rotor.
2Ease of operation
If the tail rotor power is increased to improve lateral movement in strong crosswinds, then lateral movement capability improves, but the complexity and power consumption of the system increases
Solution Approach 1:
The invention converts the harmful effect of airflow drag (which normally resists lateral movement) into a beneficial force. By strategically positioning drag devices such as plates or brakes, the invention harnesses the drag force generated during forward flight to provide additional counter-torque, thereby improving lateral movement capability in crosswinds without increasing power consumption.
Solution Approach 2:
The drag devices (plates or brakes) are designed to automatically generate counter-torque by utilizing the existing forward flight airflow. This self-service mechanism eliminates the need for additional powered systems, as the drag devices passively convert aerodynamic forces into useful counter-torque, thereby improving lateral movement capability without increasing overall system power consumption.
3Ease of operation
If a drag device or thrust fan is added to provide additional counter torque, then lateral movement capability and stability improve, but the device complexity increases
Solution Approach 1:
The introduced drag devices (plates or brakes) serve multiple functions: they provide additional counter-torque during lateral movement, contribute to yaw control, and can be integrated with existing structural components. This multi-functionality allows the system to achieve improved directional control and stability without proportionally increasing device complexity, as the same components perform multiple aerodynamic functions.
Solution Approach 2:
The invention merges the drag devices with existing rotorcraft structures, such as integrating plates into the fuselage or combining brake mechanisms with landing gear components. This merging approach allows the additional counter-torque functionality to be achieved while minimizing increases in overall device complexity, as the new components are combined with rather than added to the existing structure.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This solution enhances the rotorcraft's ability to maintain directional control and stability during sideward flight and crosswind conditions, potentially allowing for higher speeds and reduced power consumption, and may even eliminate the need for a traditional tail rotor.
Implementation Method 1
a plate disposed on a bottom side of the fuselage and aligned with a longitudinal axis of the fuselage. The plate is configured to provide counter torque to the fuselage
Implementation Method 2
at least one thrust fan disposed on a bottom side of the fuselage and aligned with a longitudinal axis of the fuselage
Data Source
AI summary
Systems and methods include providing an aircraft with a fuselage, a tail boom or empennage extending from the fuselage, a main rotor, a tail rotor, and at least one counter torque device. The counter torque device provides counter torque to the fuselage to prevent rotation of fuselage when the main rotor is operated, particularly in right sideward flight (RSF) for conventional helicopters with a counter-clockwise rotating (when viewed from above the helicopter) main rotor.