Electric Motor-Driven Tip-Jet Compound Aircraft
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Solution Overview
Problem
Current aircraft technologies, such as airplanes and helicopters, face challenges in providing efficient, convenient, and safe transportation due to noise, cost, and operational complexities, particularly in achieving vertical takeoff and landing (VTOL) and forward flight capabilities without shaft-driven rotors or gas-powered engines.
Innovation Solution
An electric compound aircraft with tip-jet-driven rotary wings and propellers powered by electric motors, eliminating the need for shaft-driven rotors and gas-powered engines, allowing for VTOL and forward flight capabilities while reducing noise, weight, and maintenance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If gas-powered tip jets are used to drive rotary wings for VTOL, then vertical takeoff and landing capability is achieved, but noise level becomes extremely high (116 dB in cockpit, 90 dB at 1/2 mile)
Solution Approach 1:
The patent replaces gas-powered mechanical tip jets with electric motor-driven tip jets. The electric motors are mounted on the rotary wing blades and powered by a battery pack, eliminating combustion engines and their associated noise. This substitution maintains VTOL capability while dramatically reducing noise levels to approximately 60 dB in the cockpit and 40 dB at ground level.
2Force
If shaft-driven rotors are used to provide lift, then vertical flight is achieved, but torque generated creates instability and vibration requiring counter-torque tail rotor and transmission system
Solution Approach 1:
The patent extracts and eliminates the shaft-driven rotor system entirely. Instead of using a central shaft that generates torque and requires a tail rotor for counterbalance, the design uses electric motors mounted directly on the rotary wing blades themselves. This removes the need for complex transmission systems, tail rotors, and associated counter-torque mechanisms, simplifying the overall aircraft architecture.
3Power
If electric motors are placed at tip of rotary wings for VTOL, then thrust augmentation ratio is high, but weight of aircraft must be carefully managed
Solution Approach 1:
The patent segments the propulsion system by distributing multiple electric motors along the rotary wing blades rather than using a single centralized power source. This segmentation allows for optimized thrust distribution and enables the use of lighter individual motor units while collectively achieving the required thrust augmentation ratio of 5:1 or greater. The battery pack is also positioned to optimize weight distribution.
4Measurement precision
If all 4 motors at 4 corners must generate exact amount of thrust for drone stability, then control precision is high, but reliability decreases as any motor failure causes fatal crash
Solution Approach 1:
The patent implements local quality by equipping each rotary wing blade with its own dedicated electric motor and control system. This allows for independent control and monitoring of each motor's performance. The control system can detect and compensate for variations in individual motor output, and can isolate failed motors without compromising the entire aircraft. This localized control architecture significantly improves reliability compared to centralized drone motor systems.
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 electric compound aircraft achieves quiet, efficient, and cost-effective VTOL and forward flight, offering a safer, lighter, and more reliable transportation solution with reduced operational expenses and environmental impact.
Implementation Method 1
electric motors placed on its rotary wings, preferably at the tip to drive the rotary wings and hence providing enough thrust to overcome the compound aircraft's weight to take off and land vertically
Implementation Method 2
The rotary wing provides lift for vertical takeoff and landing, hovering capability and during flight
Implementation Method 3
The propeller provides thrust for forward flight
Implementation Method 4
A fixed wing can be used, in addition to the rotary wing to provide lift for forward flight
Data Source
AI summary
An electric compound aircraft is disclosed with a capability of making vertical takeoff and landing and forward flight. In a specific embodiment, the compound aircraft includes an electric motor-powered tip-jet-driven rotary wing, an electric motor-powered tip-jet-driven propeller. The rotary wing provides lift for vertical takeoff and landing, hovering capability and during flight. The propeller provides thrust for forward flight. A fixed wing can be used, in addition to the rotary wing to provide lift for forward flight. Various electric control devices are used to provide control and stability for the compound aircraft and automation.