Forward-Canted Fixed Rotors for VTOL Lift and Propulsion
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Solution Overview
Problem
Existing aerial vehicles face challenges in achieving efficient vertical take-off and landing (VTOL) and forward flight operations while maintaining even lift distribution and minimizing drag.
Innovation Solution
The use of fixed rotors configured to form a synthetic wing, with rotors positioned to achieve high span efficiency and even lift distribution, and tilted forward to provide forward propulsion during horizontal flight.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If traditional VTOL aircraft use separate control surfaces for attitude control, then control authority is improved, but device complexity and drag increase
Solution Approach 1:
The rotors are designed to perform multiple functions: providing vertical lift during VTOL operations, generating forward thrust during horizontal flight through forward canting, and enabling attitude control through differential thrust modulation. This eliminates the need for separate control surfaces while maintaining full control authority.
Solution Approach 2:
The invention merges the functions of lift generation, thrust production, and attitude control into a single rotor system. The rotors are canted forward at an angle between 10-45 degrees, allowing them to simultaneously produce vertical and horizontal force components, replacing traditional separate control surfaces.
2Productivity
If rotors are positioned to provide forward thrust during horizontal flight, then forward propulsion efficiency is improved, but lift distribution uniformity deteriorates
Solution Approach 1:
The rotor array is configured with specific spacing and canting angles to create non-uniform local thrust distribution that compensates for aerodynamic interference effects. Each rotor's forward canting angle and position are optimized to ensure uniform overall lift distribution while maintaining effective forward thrust generation.
Solution Approach 2:
The rotors are canted forward in three-dimensional space at angles between 10-45 degrees, transforming the traditional vertical lift-only function into a bi-directional force system. This spatial reorientation allows simultaneous achievement of forward propulsion and uniform lift distribution through vector decomposition of rotor thrust.
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 configuration enables efficient VTOL and forward flight operations with reduced induced drag, allowing for effective attitude control without additional control surfaces, and optimizing lift-to-drag ratios for improved performance.
Implementation Method 1
The rotors form a synthetic wing and are positioned to achieve a high span efficiency
Implementation Method 2
The wing rotors are tilted forward and provide some forward propulsion during horizontal flight
Implementation Method 3
This configuration enables efficient VTOL and forward flight operations with reduced induced drag
Data Source
AI summary
A vertical take-off and landing aircraft and method which uses fixed rotors for both VTOL and forward flight operations. The rotors are positioned to achieve a high span efficiency. The rotors are positioned to even out the lift across the span of the wing. The wing may also have narrow front and rear airfoils which may provide structural support as well as providing lift during forward flight, or may have a single center wing. The wing rotors are tilted forward and provide some forward propulsion during horizontal flight.