Flying Electric Generator Rotor Spacing for Thrust Stability
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current flying electric generators (FEGs) with closely clustered rotors experience a reduction in thrust due to the downward component of air flow from forward rotors affecting aft rotors, leading to uncontrolled pitch changes during flight, especially at low positive pitch angles.
Innovation Solution
The configuration of FEGs with rotors placed in counter-rotating pairs ensures each rotor receives undisturbed wind, regardless of pitch angle, by spacing forward and aft rotors such that the aft rotors are not affected by air passing through the forward rotors, allowing for smooth control throughout flight phases.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If rotors are closely clustered in a symmetric configuration, then the device complexity is reduced and control is simplified, but the downward component of air flow from forward rotors reduces thrust of aft rotors causing uncontrolled pitch changes
Solution Approach 1:
The rotor system is segmented into distinct forward and aft groups with clear spatial separation. The forward rotors are positioned upstream and the aft rotors downstream, creating independent operational zones that prevent aerodynamic interference while maintaining overall system coordination.
Solution Approach 2:
The rotor arrangement transitions from a two-dimensional clustered configuration to a three-dimensional distributed layout. By spacing rotors both laterally and longitudinally, the design adds spatial dimensionality to eliminate wake interference while preserving control authority.
2Volume of moving object
If forward rotors are positioned close to aft rotors, then the device size is reduced, but the apparent wind direction for aft rotors is altered causing thrust reduction
Solution Approach 1:
The rotor arrangement transitions from a two-dimensional clustered configuration to a three-dimensional distributed layout. By adding longitudinal spacing between forward and aft rotors while maintaining lateral compactness, the design preserves vehicle size efficiency while eliminating wake interference through spatial dimensionality.
Solution Approach 2:
The rotor configuration employs asymmetric positioning where forward rotors are offset relative to aft rotors along the longitudinal axis. This asymmetric arrangement creates independent aerodynamic zones that prevent wake interference while maintaining overall vehicle compactness.
3Reliability
If rotors are spaced far apart to receive undisturbed air, then thrust stability is improved, but the device complexity and structural requirements increase
Solution Approach 1:
The rotor system is segmented into distinct forward and aft groups with clear spatial separation. The forward rotors are positioned upstream and the aft rotors downstream, creating independent operational zones that prevent aerodynamic interference while maintaining overall system coordination.
Solution Approach 2:
The rotor support structure serves multiple functions simultaneously: it provides mechanical support for all rotors, defines the optimal spacing for aerodynamic independence, and maintains overall vehicle structural integrity. This multi-functionality reduces the need for additional specialized components.
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 continuous, controlled operation from takeoff to power generation, eliminating discontinuities in control based on angle of attack and wind speed, allowing for seamless transitions between hovering and kite-like flight modes.
Implementation Method 1
each rotor receives clean air which is undisturbed by the other rotors mounted to the frame or body
Implementation Method 2
the downward component of the air flow emerging downwind of each forward rotor causes a reduction in thrust of an aft rotor directly downwind
Data Source
AI summary
Flying electric generator aircraft that include groupings of four rotors mounted to booms extending fore and aft of a fuselage structure wherein the rotors are placed so that when the aircraft is facing the wind, each rotor has a direct path to an undisturbed flow of air, regardless of pitch angle and during all flight maneuvers of the aircraft. The rotors are placed in counter-rotating pairs with the booms preferably angled so that the rotors in the front of the aircraft are spaced at a distance from one another that is different than a spacing of the rotors at the rear of the aircraft.