Fixed Wing VTOL UAV Design for Multi-Mode Flight Operations
Multi-modal UAVs face significant operational challenges when switching between flight modes. Current systems require complex mechanical transitions that can introduce points of failure, with documented instances of control instability during hover-to-forward flight transitions and power fluctuations exceeding 30% during mode changes. These challenges are particularly acute in confined spaces where precise control is essential.
The fundamental engineering trade-off lies in balancing the mechanical complexity needed for mode transitions against the operational reliability and control precision required for practical deployment.
This page brings together solutions from recent research—including morphing wing architectures, reconfigurable ducted rotor systems, hybrid propulsion configurations, and adaptive flight control systems. These and other approaches focus on achieving seamless mode transitions while maintaining stability and reducing mechanical complexity.
1. Transformable Multi-Modal Unmanned Vehicle with Actuatable Chassis and Integrated Propulsion Mechanisms
California Institute of Technology, 2023
A multi-modal unmanned vehicle that can transform its shape and body configuration to realize different forms of mobility and navigate unstructured environments. It can fly, roll, crawl, balance, tumble, scout, and loco-manipulate objects by changing between unmanned ground vehicle (UGV) and unmanned aerial system (UAS) modes. The vehicle has a transformable chassis and legs with wheels and propellers that can be actuated to transition between modes.
2. Hybrid Unmanned Vehicle with Pivoting Rotor and Integrated Actuation System for Aerial and Ground Modes
The Texas A&M University System, University of Maryland, College Park, 2020
An unmanned aerial/ground hybrid vehicle that can convert between aerial and ground modes using the same actuator. The vehicle has a rotor that can pivot between a vertical position for flying and a horizontal position to drive on the ground. The rotor is mounted on a shaft that can rotate to transition between the two positions. A locking mechanism holds the rotor in place once transitioned. The same motor powers the rotor in both modes. A tilting mechanism actuated by a servo motor moves the rotor between positions.
3. Multi-Drone Coordination System with Optimization Algorithms and Wireless Communication for Cooperative Flight and Task Execution
GUANGZHOU POWER SUPPLY BUREAU GUANGDONG POWER GRID CO LTD, 2024
A multi-drone coordination system for efficient, intelligent, and reliable cooperative flight and task execution of multiple drones. The system uses optimization algorithms to coordinate and optimize flight missions for multiple drones. It assigns tasks and generates optimal flight paths based on mission requirements and drone status. The drones have flight control units with modules for attitude control, navigation, path planning, and obstacle avoidance. They also have sensors for positioning, environment perception, and collision detection. The system uses wireless networks with high-speed, parallel, reliable, encrypted data transmission for efficient communication.
4. Pivoting Morphing Wing with Rotating Outer Section for Variable Flight Modes
Stellar Advanced Concepts Ltd, 2023
A morphing wing design for aircraft like unmanned aerial vehicles (UAVs) enables rapid transition between high maneuverability and high-speed flight modes. The wing pivots at the aircraft body and rotates the outer section downward and inward. This reduces lift and drag compared to the extended position. The pivoting wing shape creates a fluid channel under it for lift generation. The morphing wing allows quick changes between low-drag configurations for fast dives/climbs and high-lift configurations for slow flight. This provides enhanced maneuverability and speed for applications like counter-UAS.
5. Modular Unmanned Aerial Vehicle with Interchangeable Payload Interface System
GUANGDONG INST OF ARTIFICIAL INTELLIGENCE AND ADVANCED COMPUTING, GUANGDONG INSTITUTE OF ARTIFICIAL INTELLIGENCE AND ADVANCED COMPUTING, 2023
Modular unmanned aerial vehicle (UAV) that allows swapping specialized payload modules to perform multiple tasks without replacing the entire UAV. The UAV has a central control module, battery, and bottom board to connect payloads like cameras, sensors, and propulsion modules. This allows quick swapping of modules for different functions like photography, inspection, firefighting, etc. The central control module coordinates with the payloads through the bottom board.
6. Integrated Land-Air Vehicle with Reconfigurable Seating and Combined VTOL Rotor-Wheel Propulsion System
FOSHAN SHENFENG AVIATION TECH CO LTD, FOSHAN SHENFENG AVIATION TECHNOLOGY CO LTD, 2022
Compact and simplified land-air dual-purpose flying vehicle that can transition between driving on the ground and flying in the air. The vehicle has a body with a steering wheel and seats for driving, but when the seats are reconfigured, it becomes a flying vehicle with flight controls. The vehicle body also houses a vertical takeoff and landing (VTOL) multi-axis rotor and a propeller integrated into one of the wheels. This allows the vehicle to hover, fly, and drive without requiring separate propulsion and control systems for each mode.
7. Modular UAV with Interchangeable Fixed-Wing and Multi-Rotor Assemblies
AUTEL ROBOTICS CO., LTD., 2022
A modular unmanned aerial vehicle (UAV) design that allows conversion between a vertical takeoff and landing fixed-wing UAV and a multi-rotor UAV by swapping interchangeable assemblies. The UAV has a central frame with detachable fixed-wing and rotor assemblies. The fixed-wing assembly has side wings with rotating tips and a center section. The rotor assembly has arm components with rotors. The frame has mounting points for both assemblies. This lets users easily switch between the fixed-wing UAV for efficient flight and the multi-rotor UAV for vertical takeoff/landing and maneuverability.
8. Hybrid Unmanned Aerial Vehicle with VTOL and Fixed-Wing Transition, Tail Boom VTOL Units, Solar-Powered Vertical Thrust, and Amphibious Capabilities
UCAL FUEL SYSTEMS LTD, 2021
A long endurance hybrid unmanned aerial vehicle (HUAV) that can transition between vertical takeoff/landing and fixed wing flight modes. It has a fixed wing section with a forward thrust motor, and VTOL units with vertical thrust motors on the tail boom. Solar cells on the wings power the VTOL motors during takeoff/landing. The control unit gradually transitions flight modes by varying motor speeds. The HUAV can also amphibiously land/takeoff on water. It has payloads like cameras, sprayers, sensors, and communication systems. The HUAV is autonomous, swarmable, and has hybrid power sources like batteries, fuel cells, and solar panels.
9. Unmanned Aerial Vehicle with Convertible Fixed-Wing and Multi-Ducted Configurations
Northwestern Polytechnical University, NORTHWESTERN POLYTECHNICAL UNIVERSITY, 2021
A variable configuration unmanned aerial vehicle (UAV) that can switch between fixed wing and multi-ducted configurations for long range cruise and hovering/maneuverability. The UAV takes off using a rocket engine and fixed wings. After reaching the target, it separates the wings and tail to become a multi-ducted aircraft with ducted fans. This allows hovering and precise maneuverability. The multi-ducted fuselage has a compartment for mission payloads. The separation is triggered by explosive bolts.
10. Land-Air Drone with Symmetrical Six-Arm Rotor Configuration and Ball-Hinged Wheeled Support Rod
NANJING UNIVERSITY OF AERONAUTICS AND ASTRONAUTICS, UNIV NANJING AERONAUTICS & ASTRONAUTICS, 2021
A land-air dual-purpose drone that can operate both on the ground and in the air. The drone has a body with six symmetrical arms, each arm has a motor and a rotor. The bottom of the body connects to a support rod through a ball hinge. The support rod has wheels at the other end allowing the drone to roll on the ground. The drone can transition between ground and air modes by unfolding the wheels and lifting off, or folding the wheels and landing. A signal receiver on the body allows remote control.
11. Modular Unmanned Aerial Vehicle with Detachable Fixed-Wing and Rotor Assemblies
SHENZHEN AUTEL INTELLIGENT AVIATION TECH CO LTD, SHENZHEN AUTEL INTELLIGENT AVIATION TECHNOLOGY CO LTD, 2020
An unmanned aerial vehicle (UAV) that can vertically take off and land like a drone and then transition to fixed-wing flight for endurance. The UAV has a detachable fixed wing assembly and a detachable rotor assembly. The body connects to either assembly for vertical takeoff/landing or fixed-wing flight. This allows using the drone-like rotors for short-range tasks and detaching them for long-range fixed-wing missions. The body has features like a tail and support frame that work with both assemblies.
12. Hybrid Aerial and Submersible Vehicle with Tilting Wings and Integrated Propulsion System
KHALIFA UNIVERSITY OF SCIENCE AND TECHNOLOGY, UNIV KHALIFA SCIENCE & TECHNOLOGY, 2020
A hybrid unmanned aerial and submersible vehicle that can transition seamlessly between air, water, and submerged operation. The vehicle has tilting wings that allow vertical takeoff and landing on water. The fuselage is designed for both aerial and underwater use. The vehicle can fly, swim, dive, and navigate underwater using the same propulsion system. It can also transition between modes without surface infrastructure. The hybrid vehicle enables versatile operations in multiple environments without the need for specialized vehicles.
13. Multi-Modal Drone with Detachable Propeller Arm and Coupling Mechanism for Air, Land, and Water Transitions
SOONCHUNHYANG UNIVERSITY INDUSTRY ACADEMY COOPERATION FOUNDATION, UNIV SOONCHUNHYANG IND ACAD COOP FOUND, 2020
A multi-purpose drone that can fly, drive on land, and float on water. The drone has a detachable propeller arm that can be removed for land and water travel. The drone also has a coupling mechanism between the air and water units for seamless transitions between modes. The drone is controlled by a single controller for both air and ground/water movement.
14. Asymmetric UAV with Dual-Wing Configuration and Tri-Propeller Sets for Torque-Free Transition Between Hover and Forward Flight Modes
ST ENGINEERING AEROSPACE LTD., 2020
Asymmetric unmanned aerial vehicle (UAV) capable of vertical take-off and landing (VTOL) with simplified and efficient transition between hovering and forward flight modes. The UAV has an asymmetrical configuration with one main wing a smaller intersecting wing, and three sets of propellers along the wings. The propellers are arranged to generate torque-free roll and yaw moments during transition. The unique wing and propeller arrangement allows a simple and fast transition between modes while providing stable flight and control in all orientations.
15. Compound-Wing UAV with Integrated Ducted Lift Rotors and Fixed-Wing Flight Capability
GAO FENG, WANG YING, 2019
Compound-wing electric powered unmanned aerial vehicle (UAV) for efficient inspection of reservoirs. The UAV has vertical takeoff and landing capability along with fixed-wing flight. The UAV has an integrated fuselage with embedded ducted lift rotors on both sides. The rotors are opposite spinning to enable vertical takeoff/landing. Wings with ducted propulsion fans are also provided. The UAV has a cockpit, battery compartment, tail, and landing gear. The symmetrical rotors and ducts allow vertical takeoff/landing while the wings provide efficiency for cruising. The UAV can operate in reservoirs with vertical access and fixed-wing speed.
16. M-Shaped Wing VTOL Aircraft with Tilt-Rotor Propulsion for Dual-Mode Lift and Thrust Generation
Bell Helicopter Textron Inc., 2019
VTOL aircraft design that can transition between vertical takeoff/landing and efficient forward flight modes, enabling runway-free operation with high-speed capabilities. The aircraft features M-shaped wings with forward and backward-swept portions and tilt-rotor propulsion. This allows it to generate lift from thrust vectors in VTOL mode and from the wings in forward flight mode. The tilting rotors provide thrust vectoring for vertical lift and thrust, while the swept wings generate lift in horizontal flight.
17. Carrier UAV with Detachable Platform for Compact UAV Deployment
Stealth Air Corp, 2019
A system for transporting multiple compact unmanned aerial vehicles (UAVs) using a larger carrier UAV to conserve resources and enable longer range flights. The carrier UAV has a platform for attaching and launching the smaller UAVs. This allows the compact UAVs to be carried further by the larger UAV than they could go on their own. The smaller UAVs can then separate and perform specialized missions at the destination. The larger carrier UAV has better range and payload capacity compared to the compact UAVs.
18. Modular Drone with Interchangeable Multicopter and Airplane Flight Components
Park Cheol, 2019
A drone with a modular design that allows it to switch between multicopter and airplane flight modes. The drone has a body with attachments for both horizontal multicopter propellers and vertical airplane propellers. It also has wing attachments. This lets the user replace the horizontal propellers with vertical propellers and wings for airplane flight, or use the horizontal propellers only for multicopter flight. The drone body has electronics to control both types of propellers. This allows versatility between the efficient lift of an airplane and the maneuverability of a multicopter. The modular design enables the drone to have both functions in one device instead of requiring separate multicopter and airplane drones.
19. Dual-Mode Unmanned Aerial Vehicle with Momentum-Based Mode Transition Mechanism
Korea Advanced Institute of Science and Technology, 2019
Efficiently transitioning between flight and ground modes in a dual-mode unmanned aerial vehicle (UAV) to improve speed and reduce power consumption compared to stopping and restarting in mid-air. The method involves using the horizontal momentum of the UAV when switching modes. When taking off, the UAV generates vertical thrust to reach target altitude within a set time based on horizontal speed. When landing, it uses vertical thrust to maintain horizontal speed. This allows seamless mode transitions without stopping.
20. Drone with Bidirectional Propeller System for Omnidirectional Takeoff and Landing
OSLO UNIVERSITETSSYKEHUS HF, 2019
Allowing drones to take off from any orientation, including upside-down, by reversing the rotation direction of some propellers. The drone has propellers with sets of rotating parts that can spin in opposite directions when flipped. This allows the drone to maintain lift and fly rightside-up or upside-down. The drone can be programmed to automatically flip itself if sensors detect certain conditions. The reversed propeller directions prevent contact with the ground when landing upside-down. The drone can also land and take off from inclined surfaces.
The introduction of multi-modal drones has led to a substantial advancement in unmanned aerial vehicle technology. Because of their versatility, they may be effectively used for delivery services in remote areas and search and rescue operations in difficult terrain. It integrates both on-land and underwater operations skills with aircraft knowledge.
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