Paramotor Dynamic Torque Compensation via Aerofoil Cage
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Solution Overview
Problem
Current paramotors face challenges in maintaining straight flight due to static torque compensation methods, which become ineffective at varying engine revolutions or wing configurations, leading to pronounced turning tendencies.
Innovation Solution
Dynamic torque compensation is achieved by using a propeller cage with lift-generating surfaces of asymmetric or symmetric airfoil profiles with non-zero angles of attack, positioned radially to generate rotational lift opposing the torque effect, ensuring compensation grows with propeller speed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If static weight-shift compensation is used to counteract torque effect, then torque compensation is achieved at a specific engine power setting, but the compensation becomes ineffective when engine revolutions or wing configuration change
Solution Approach 1:
The patent applies the dynamics principle by replacing static weight-shift compensation with dynamic aerodynamic surfaces on the propeller cage. These surfaces generate compensating forces through air flow that automatically adjust with propeller rotation speed, enabling adaptive torque compensation across varying engine revolutions and wing configurations without requiring mechanical repositioning or additional control inputs from the pilot.
Solution Approach 2:
The patent implements parameter changes by designing aerodynamic surfaces whose lift-generating characteristics vary with propeller speed. As rotation speed changes, the aerodynamic parameters (lift force, moment arm effectiveness) automatically adjust to match the changing torque effect, maintaining compensation effectiveness across different operating conditions including varying engine power settings and wing trim configurations.
2Power
If propeller rotation speed is increased to provide more thrust, then forward thrust is improved, but torque effect grows exponentially causing pronounced turning tendency
Solution Approach 1:
The patent converts the harmful torque effect into a beneficial compensating force by using aerodynamic surfaces on the propeller cage. The same air flow that creates torque also generates lift on the asymmetrically positioned surfaces, creating a counter-torque moment that opposes the propeller's rotational effect. This transforms the harmful turning tendency into a useful stabilizing force that increases proportionally with propeller power output.
Solution Approach 2:
The patent applies asymmetry by positioning aerodynamic surfaces asymmetrically on the propeller cage structure. This asymmetric configuration creates a differential lift distribution that generates a moment opposite to the propeller torque, effectively counteracting the turning tendency while allowing the propeller to operate at high rotation speeds for maximum thrust production.
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
The paramotor can fly straight and make sharp turns without pilot input at any speed or power setting, with turning capability unaffected by propeller torque, due to adaptive torque compensation.
Implementation Method 1
The air flow through the cage generates rotational lift (12) to compensate the torque effect
Data Source
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AI summary
Paramotor with dynamic torque compensation comprises of frame (1), harness or seat (2), engine and propeller (3) rotating in a cage (4) characterized by one or more surfaces placed on said frame and/or said cage in such a way that when air flows around them aerodynamic forces are generated in th eopposite direction to the propeller torque. These surfaces are characterized by asymetric profile (13), symetric profile with non-zero angle of attack (14), asymmetric profile with non-zero angle of attack (15) or in a form o flaps or ailerons with non-zero angle of attack (16). Said surfaces may have adjustable angle of attack (17).