Rotorcraft Anti-Torque Thrust Margin Monitoring at High Altitude
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Solution Overview
Problem
Current power situation indicators for rotorcrafts do not provide information on the available thrust margin of the anti-torque member, which is crucial for maintaining control and maneuverability, especially at high altitudes where the power margin decreases due to low air density.
Innovation Solution
A device that calculates and monitors the available thrust margin of the anti-torque member using a computer to compare the current operating parameter, which is a ratio of engine power to air density, with a predetermined threshold value, allowing pilots to maintain a minimum thrust margin for stable yaw control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If a high-powered engine is used to maintain the main rotor at current altitude during high-altitude flight, then the lift capability is improved, but the available power margin at the anti-torque mechanism decreases
Solution Approach 1:
The patent segments the power monitoring function into two independent parts: existing FLI indicators for main rotor power margin, and a new dedicated indicator for anti-torque device power margin. This allows pilots to monitor each system's power availability separately, enabling informed decisions about when to prioritize lift maintenance versus yaw control capability.
Solution Approach 2:
The patent introduces a new operating parameter (reduced available power) as an intermediary that translates complex interactions between engine power, air density, and anti-torque device performance into a single monitorable value. This intermediary parameter mediates between the conflicting demands of maintaining lift and preserving anti-torque power margin.
2Force
If the available power margin at the anti-torque system becomes too small during high-altitude flight, then the engine can maintain altitude, but the rotorcraft's control or maneuverability performance degrades
Solution Approach 1:
The patent enables preliminary action by providing pilots with advance warning through the new indicator about declining anti-torque power margin before it becomes critically low. This allows pilots to proactively adjust flight parameters (such as reducing collective pitch or adjusting heading) to preserve control authority, rather than reacting after degradation has already occurred.
Solution Approach 2:
The patent implements a feedback mechanism where the new indicator continuously monitors and displays the anti-torque device's power margin status to the pilot. This closed-loop feedback allows pilots to observe the direct consequence of altitude maintenance actions on control availability and make real-time adjustments to maintain adequate maneuverability margins.
Data Source
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AI summary
The present invention relates to a device (1, 11) for monitoring an available thrust margin of an anti-torque element (2) of a rotorcraft (3) as a function of flight conditions, said rotorcraft (3) comprising a drive system (4) driving in rotation at least one main rotor (5) participating at least in the lift of said rotorcraft (3) said anti-torque element (2) participating in the control of the yaw movements of said rotorcraft (3).According to the invention, said device (1, 11) comprises: • a calculator configured to calculate a current value of an operating parameter representative of said thrust margin of said anti-torque member (2), said operating parameter being a function of a ratio between an available power of said engine installation (4) and at least one physico-chemical parameter representative of a density of the surrounding outside air, • comparison means configured to compare said current value of said operating parameter with a predetermined threshold value of said operating parameter and to determine said available thrust margin of said anti-torque member (2).