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FIELD GRAND CHALLENGE article

Grand challenges in aerospace engineering.

• Department of Mechanical Engineering and Materials Science, Washington University in St. Louis, St. Louis, MO, United States

Introduction

Since the historic first powered flight of a heavier-than-air aircraft (known as the Wright Flyer) on 17 December 1903 at Kill Devil Hills near Kitty Hawk, North Carolina, there has been a revolutionary transformation in technologies that have made the air travel around the globe possible for general masses by commercial aircraft such as B737 to B787 and A310 to A380 and this technological progress is continuing today. It is clear that the new generation of air vehicles would be built using new materials, low weight optimized structures of composite materials, advanced aerodynamic configurations with flow control, new propulsion concepts and technologies using fuels such as SAF, Synthetic fuels, hydrogen, batteries, etc. In addition, advanced and revolutionary navigation and control system and avionics are being developed, and advanced ATM and NEXTGEN are getting ready to manage the air space. The following sections describe the key challenges that need to be addressed in the six technology areas. The goal of the journal “Frontiers in Aerospace Engineering” is to attract high quality papers from researchers working in all these challenge areas and make them rapidly available on open access platform to the aerospace community after a rigorous peer review process. Papers on multi-disciplinary applications of various aerospace technologies as well as those addressing futuristic aerospace configurations/designs such as electric/hybrid and hydrogen-powered commercial subsonic/transonic aircraft, low boom supersonic aircraft, air-breathing hypersonic aircraft, and e-drones/UAV/MAVs are especially welcome.

Challenge 1: aerodynamics and flight mechanics

This technical challenge includes both fundamental and applied aspects of aerodynamics ( Cummings et al., 2015 ; Bertin and Cummings, 2021 ) and flight mechanics ( Stengel, 2022 ) that promote their better understanding as they relate to the advance and futuristic aerospace systems including the environmentally responsible aerodynamic technologies and designs ( Agarwal, 2009 ; Agarwal, 2012 ). The papers describing applications of aerodynamics fundamentals to new aerospace engineering systems technology by combining theoretical, experimental, and computational studies of multidisciplinary nature are especially sought. The topics covered by this challenge include, but are not limited to aerodynamics of streamline and bluff bodies, free- and wall-shear-flow stability, aerodynamic measurements, aerospace thermo-fluids experiments and simulations, laminar, transitional, turbulent and separated flows, jets, wakes and shear flows in general, passive, active and re-active flow control ( Gad-el-Hak, 2000 ; Agarwal et al., 2006 ), open and closed loop control, actuator and sensors, reduced—order modeling and flow control, fluid-structure interaction and aero-elastic analysis and control ( Collis et al., 2004 ), flight mechanics innovations, aerodynamics of the ground vehicles ( Qu et al., 2014 ) and the marine vehicles ( Qu et al., 2016 ), high-lift systems ( Wild, 2022 ), Computational Fluid Dynamics ( Anderson et al., 2020 ), turbulence and transition modeling and validation ( Wilcox, 2006 ; Durbin, 2021 ), Large Eddy Simulation (LES) and Direct Numerical Simulations (DNS) ( Jiang and Lai, 2017 ), applications to aircraft ( Agarwal and Deese, 1990a ; Agarwal, 1999 ) and rotorcraft ( Agarwal and Deese, 1990b ) and other air vehicles. Papers are also sought with applications of Machine Learning and Artificial Intelligence to aerodynamics ( Vinuesa and Brunton, 2022 ). In the area of flight mechanics, papers are sought in the areas of nonlinear six-degree of freedom flight simulation, lateral, longitudinal and coupled aircraft motions, flight control design of all categories of aircraft, aircraft, and flying qualities and flight performance.

Challenge 2: materials and structures

The demand of new materials and structures for aircraft and aerospace engineering industries has increased dramatically. High-strength, lightweight, non-corrosive, recyclable, ultra-violet (UV) and impact resistant properties are key factors for materials for new type of flying vehicles ( Zhang et al., 2018 ) Advanced manufacturing processes including additive manufacturing, digital manufacturing and virtual-twin technologies provide new solutions for different types of space structures subject to harsh space environments ( Blakey-Milner et al., 2021 ; Li et al., 2022 ). Nanotechnology supports the fundamental changes of materials and mechanical properties of metal and polymer-based composites to add values, in terms of better electrical, mechanical, thermal, and multifunctional properties of host materials for structures at different extreme temperature conditions ( Ni et al., 2022 ). Electro-magnetic shielding properties of polymer-based composites could be altered by nanofillers for space re-entry vehicles ( Van der Heijden, 2018 ). For small space structures, like cube satellites, metamaterials, deployable and morphing structures are of interest to space engineers and researchers. The development of full electric-driven and hydrogen/electric (hybrid) driven vertical takeoff and landing (eVTOL) or short take-off and landing (eSTOL) vehicles requires new materials to compensate the weight penalty from batteries ( Dale et al., 2020 ). The ambient condition of flying vehicles at high altitude and space environment are low temperature, low pressure and full of radiation attacks that may deteriorate the properties of materials. Space debris and natural meteoroids moving at hyper-velocity can damage satellites and space stations easily due to accumulated high impact energy. Nano-structural design may be promising to dissipate energy to prevent catastrophic damages to the structures. To overcome these challenges ahead, designing and adopting new materials and structures for the aircrafts and space vehicles are crucial to support the growth of aerospace industry ( Fleck et al., 2020 ).

In summary, the focus of this challenge is on the new materials and structures covering their fundamental properties to applications, multifunctional properties, advanced manufacturing processes, modelling and analysis, data-driven technologies including data-security in the manufacturing 4.0 network, additive manufacturing, digital/virtual twins, etc. Carbon-based materials that drive the development of high-temperature resistant composites, energy composites including supercapacitors, cryogenic fuel tanks and radiation-resistant coating layers for space structures also fall into this specialty. The papers in any of these areas are sought.

Challenge 3: aerospace propulsion and energetics

An excellent summary of this challenge has already been published by Oehlschlaeger (2022) in Frontiers in Aerospace Engineering. Here, some of his observations are highlighted for the sake of completeness of this article.

Propulsion technologies are well established for low speed to supersonic air flight, payload launch to space, and missions within space. However, existing commercial systems have shortcomings in terms of their sustainability and often operational performance (range, speed, power density, safety, etc.). These shortcomings are being addressed through fundamental and applied research that seeks to overcome existing challenges to improve current technologies and develop new concepts.

Conventional aircraft propulsion is predominantly reliant on aviation fuels from fossil sources and has considerable impact on the environment, through the emission of greenhouse gases and air pollutants and generation of contrails ( Nelson and Reddy, 2018 ). In response, there is ongoing research on the development of aircraft propulsion systems that are fully electric, hybrid-electric, and/or operate using hydrogen fuels or alternative fuels offering reduced environmental impact (electric, bio-derived, and synthetic fuels). Research and development efforts on next-generation of aircraft propulsion to address sustainability challenges are multi-disciplinary and involve the development of bio-chemical engineered fuels, fuel cells for efficient conversion of chemical energy to electricity, next-generation batteries, and new hybrid and electric concepts for distributed and embedded propulsion units such that the air vehicle geometries can be re-envisioned and optimized ( Pelz et al., 2021 ).

Air-breathing hypersonic propulsion systems have been pursued for decades but are still in the research and development phase, owing to the inherent difficulties of designing robust systems capable of supersonic combustion and handling the hypersonic aero-thermodynamic environments. Research challenges in this the area of air-breathing hypersonic include the fundamental understanding of the supersonic-combustion such that the scramjet engines can be designed that operate on hydrogen or liquid fuels and are sufficiently compact and robust to be integrated into an air vehicle and operate for minutes to hours rather than seconds. Among the current research challenges relating to hypersonic vehicle propulsion include supersonic fuel-air mixing ( Huang et al., 2019 ), combustion stabilization ( Liu et al., 2020 ), materials and cooling systems offering thermal management and protection at the extreme conditions encountered, and the development of ground-based experimental facilities to test hypersonic concepts ( Gu and and Olivier, 2020 ).

Electric space propulsion systems have seen rapid growth over the last several decades for a variety of applications, including Hall, ion, and electrothermal thrusters. However, significant research is ongoing to develop new electric propulsion concepts that improve specific impulse, efficiency, scalability, longevity, and reliability of these systems ( Dale et al., 2020 ). Examples of electric propulsion concepts for space that are under research and development include electrospray arrays, radio frequency- or microwave-systems coupled with magnetic nozzles, pulsed inductive thrusters, magneto-plasma-dynamic (MPD) and nuclear thermal (NT) propulsion systems among others ( O’Reilly et al., 2021 ). Research challenges for future electric space propulsion systems will address the need to improve the specific impulse and longevity of the high-thrust systems and the efficiency and reliability of low-thrust systems ( Dale et al., 2020 ).

Commercial solid and liquid energetics for propulsion and munitions applications take a variety of forms and have been developed over a century or more; however, there are still significant research challenges in developing new energetic materials with improved properties and reduced environmental impact. These include the development of solid propellants and solid hybrid propulsion fuels utilizing additives that increase regression rate ( Pang et al., 2021 ). Solid energetics for munitions applications are sought that are insensitive to thermal, mechanical, or electrical stimuli but have increased energy release rates relative to the incumbents ( Anniyappan et al., 2020 ). For both munitions and propulsion applications, solid energetic formulations that take advantage of the nanomaterial features ( Van der Heijden, 2018 ) or are additively manufactured are being developed ( Fleck et al., 2020 ). Additionally, green monopropellants for space propulsion that offer reduced environmental impact and address safety concerns are areas of active research and development ( Nossier et al., 2021 ).

The papers are sought in all the research and technology areas describe above.

Challenge 4: guidance, navigation, and control (GNC)

The issues related to guidance, navigation, and control (GNC) are receiving increased attention in aerospace engineering research and applications ( Stengel, 2022 ; Yan et al., 2023 ). One of the objectives of this challenge is to provide a platform to both the theoreticians and the practitioners to share their latest results and identify critical issues and challenges for further investigation in GNC. The papers are sought on new advances in GNC including the advanced dynamic modeling, fault management capabilities, reconfigurable and fault tolerant flight control ( Yin et al., 2016 ), guidance and navigation systems and multi-sensor data fusion ( Ye et al., 2023 ), sensor and actuator fault monitoring and diagnosis, detection and mitigation of anomalous events and threats, upset recovery and management of loss of control in-flight (LOC-I) regimes, safe flight envelope prediction and protection, new decision-making methods, model identification and optimization, and intelligent functionalities for trustworthy and evolvable autonomy for next-generation unmanned systems. With the advent of artificial intelligence and machine learning, unmanned systems (e.g., satellites, unmanned aerial vehicles, unmanned underwater vehicles, etc.) are playing an irreplaceable role in civil and military aviation. Navigation and control are of key importance to the unmanned system. Without navigation and control, the unmanned system would have no autonomy. There is a great push for new technological developments in the unmanned systems to meet the ever-higher safety, autonomy, and sustainability requirements. In these fields, the challenges and emerging needs continue to grow as individual systems evolve and operate with greater autonomy and intelligence within a networked and distributed cyber-physical environment. The papers are also sought that highlight developments in GNC areas that include sensors, actuators, communications, estimation, control as well as applications of AI and machine learning in GNC including the comprehensive reviews/surveys of these areas ( Wu et al., 2021 ; Li et al., 2023 ).

Challenge 5: intelligent aerospace systems

An excellent summary of this challenge has already been published by Cohen (2023) in Frontiers in Aerospace Engineering. Here, some of his observations are highlighted for the sake of completeness of this article.

The growing trends in Artificial Intelligence (AI) ( Adadi and Berrada, 2018 ) coupled with increasingly autonomous aerospace systems bring about a major paradigm shift resulting in new opportunities that have the potential to radically extend the state of the art. These innovative technologies are pushing the market in new area such as the advanced air mobility which has an estimated global market value of USD 1.9 trillion in the next 25 years. Recent demonstrations by civilian space industry have opened avenues like space tourism and the investments in the long term deep space missions are growing. Autonomy ( Clarke and Tomlin, 2020 ; Bartlett et al., 2023 ) is a key enabler and needs to be trustworthy ( Baron et al., 2018 ; Kaur et al., 2022 ). It must synergize with human operators to augment performance and assure safety and reliability of operations. The goal of this challenge is to promote new advances in intelligent aerospace systems and technologies that incorporate exciting and relevant developments in the Industrial Revolution 4.0/5.0. The topics covered in this challenge, having a common theme of AI-Enabled Aerospace Systems, include but not limited to Systems Engineering of AI-Enabled Aerospace Systems, Responsible, Trustworthy, Transparent and Certifiable AI, Supervised, Semi-supervised and Unsupervised Explainable AI, Assured Autonomy for non-deterministic systems, Advanced Air Mobility, Cyber-attack Resilience, Real-time Learning and Adaptation, AI driven Prognostics and Health Management, Scalable, Robust, Large Collaborative Systems, Human-AI Teaming and Optimization, AI-Enabled Augmented Reality/Virtual Reality for Training and CONOPS development, etc. The papers are sought in all the above and related areas.

Challenge 6: aircraft engineering and design

Aircraft Design Challenges are safety, long-haul flights, sustainability and capacity ( Torenbeek, 2013 ). Modern aircraft designs have been driven by “higher, faster and farther” doctrine ( Kundu et al., 2019 ). In traditional design paradigm, the goal has been continuous improvements in performance accompanied by continuous increase in complexity and cost ( Raymer, 2006 ) which is now not acceptable to both the supplier and the customer; the requirement now is the continuous improvements in performance accompanied by the continuous increase in complexity with lower cost. Lean aircraft engineering concepts have been introduced to substantially reduce time, resources, and risk, and increase quality, utility, and supportability while reducing total ownership cost, and enable integrated product and process development (IPPD) concept across the full acquisition life cycle by using modeling and simulation to reduce life cycle cost (LCC) ( Raj, 1998 ). Over the years, many methods have been developed to facilitate decision-making at various stages of design process—Computer-Aided Design (CAD). Finite Element Methods (FEM), and Computational Fluid Dynamics (CFD).

The traditional design consisted of three steps—Conceptual design, Preliminary design and Production design which resulted in long cycle time, high risk and high cost. Decisions were made in early stages using data from crude and simplistic analyses and much time was spent to reconcile design changes proposed by various engineering disciplines and the design, manufacturing, operations, and support were essentially segregated. The way forward is therefore to use an integrated approach which simultaneously considers all aspects including design, manufacturing, and support and considers all requirements and constraints from start thus reducing the need for design changes in the later stages by conducting cost/performance trade-offs early using more knowledge from modeling and simulation tools. This integrated approach shortens design cycle time and reduces risk and cost ( Raj, 1998 ).

The way forward to meet the challenges is to introduce innovative technologies and develop an integrated, effective, and efficient process for the life cycle design of aircraft, known as systems engineering (SE). SE is a holistic approach to a product that comprises several components. Customer specifications, conceptual design, risk analysis, functional analysis and architecture, physical architecture, design analysis and synthesis, and trade studies and optimization, manufacturing, testing validation and verification, delivery, life cycle cost and management. Further, it involves interaction among traditional disciplines such as aerodynamics, structures and flight mechanics with people- and process-oriented disciplines such as management, manufacturing, and technology transfer. SE has become the state-of-the-art methodology for organizing and managing aerospace production. Typically, the research into SE provides a deeper understanding of the core principles and interactions and helps one to appreciate the required technical architecture for fully exploiting it as a process, rather than a series of events. There are major issues as regards to systems approach to aircraft design which include lack of basic scientific/practical models and tools for interfacing and integrating the components of SE and within a given component, for example, the life cycle cost and the basic models for linking the key drivers. The papers are sought in all aspects of SE for aircraft design as well as the advanced modeling and simulation tools required. The papers on the practical case studies of aircraft design are especially welcome.

Author contributions

RA: Writing–original draft, Writing–review and editing.

Acknowledgments

The author gratefully acknowledges the inputs and contributions from Prof. Cohen, Prof. Das, Prof. Oehlschlaeger, and Prof. Xiao.

Conflict of interest

The author declares that the research was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest.

The author(s) declared that they were an editorial board member of Frontiers, at the time of submission. This had no impact on the peer review process and the final decision.

Publisher’s note

All claims expressed in this article are solely those of the authors and do not necessarily represent those of their affiliated organizations, or those of the publisher, the editors and the reviewers. Any product that may be evaluated in this article, or claim that may be made by its manufacturer, is not guaranteed or endorsed by the publisher.

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Keywords: aerodynamics and flight mechanics, aircraft materials and structures, propulsion and energetics, guidance, navigation and control, intelligent aerospace systems, electronic aviation systems, aircraft engineering and design

Citation: Agarwal RK (2024) Grand challenges in aerospace engineering. Front. Aerosp. Eng. 3:1383934. doi: 10.3389/fpace.2024.1383934

Received: 08 February 2024; Accepted: 19 February 2024; Published: 04 March 2024.

Edited and reviewed by:

Copyright © 2024 Agarwal. This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

*Correspondence: Ramesh K. Agarwal, cmthQHd1c3RsLmVkdQ==

Disclaimer: All claims expressed in this article are solely those of the authors and do not necessarily represent those of their affiliated organizations, or those of the publisher, the editors and the reviewers. Any product that may be evaluated in this article or claim that may be made by its manufacturer is not guaranteed or endorsed by the publisher.

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Top 50 Emerging Research Topics in Aerospace Engineering

Research topics Aerospace Engineering

Aerospace engineering is a dynamic field that constantly evolves with technological advancements and the exploration of new frontiers. As we move further into the 21 st century, the aerospace industry faces an array of complex challenges and exciting opportunities. To help guide researchers and enthusiasts, iLovePhD has compiled a list of the Top 50 emerging research topics in the field of aerospace engineering. These topics encompass various aspects of aerospace engineering, including propulsion, materials, aerodynamics, space exploration, and sustainability.

Research Topics in Aerospace Engineering

A. advanced materials and structures.

1. Nanomaterials in Aerospace : Exploring the use of nanomaterials to enhance structural properties and create stronger, lighter, and more durable materials.

2. Bio-Inspired Materials : Research materials inspired by nature, such as biomimetic composites, to improve structural design and performance.

3. Self-Healing Materials : Investigating materials capable of autonomously repairing damage, crucial for increasing the lifespan of aerospace components.

4. 3D Printing in Aerospace : Enhancing the use of additive manufacturing for complex geometries and producing lighter, stronger, and customized components.

5. Smart Materials : Research adaptive materials that change properties in response to external stimuli to improve efficiency and safety in aerospace structures.

B. Advanced Propulsion Systems

6. Electric Propulsion : Studying electric propulsion systems, such as ion drives or electric turbofans, for efficiency and reduced environmental impact.

7. Hybrid Propulsion : Exploring combinations of traditional and alternative fuels for more efficient and environmentally friendly propulsion systems.

8. Micro-propulsion Systems : Researching miniaturized propulsion systems for small satellites and micro-spacecraft.

9. Hypersonic Propulsion : Investigating engines capable of sustained operation at hypersonic speeds for high-speed travel and space applications.

10. Green Propellants : Developing non-toxic, environmentally friendly fuels to reduce the environmental impact of aerospace missions.

C. Autonomous Systems and AI

11 . Autonomous Flight Control : Researching and implementing AI-driven systems for autonomous flight control in unmanned aerial vehicles and aircraft.

12. Decision-Making Algorithms : Developing AI algorithms for autonomous systems to make real-time decisions during complex flight scenarios.

13. Swarm Intelligence in Aerospace : Investigating swarm robotics and AI for coordinated operations of multiple drones or satellites.

14. Predictive Maintenance : Implementing AI to predict and prevent mechanical failures, reducing maintenance costs and enhancing safety.

15. AI in Space Exploration : Utilizing AI for autonomous exploration and decision-making in space missions, such as on Mars or other celestial bodies.

D. Space Debris Management

16. Active Debris Removal: Researching and developing technologies for actively removing space debris to reduce collision risks in orbit.

17. Orbital Traffic Management: Implementing systems to track and manage the growing number of satellites and spacecraft in orbit.

18. Debris Mitigation Strategies : Investigating techniques to design satellites with built-in capabilities to reduce debris creation.

19. Space Situational Awareness: Advancing technologies for better tracking and monitoring space objects to prevent collisions.

20. Deorbiting Technologies: Developing methods to safely deorbit defunct satellites and spacecraft to burn up in the Earth’s atmosphere.

E. Aero-elasticity and Aero-acoustics

21. Aero-elastic Tailoring : Studying how to design aircraft wings to adapt and reduce flutter or oscillations in flight.

22. Noise Reduction Technologies : Research advanced materials and designs to mitigate aircraft noise for improved environmental impact.

23. Structural Health Monitoring : Developing sensors and systems for continuous monitoring of aircraft structures to predict potential failures.

24. Sonic Boom Mitigation : Investigating techniques to reduce the intensity of sonic booms to enable supersonic commercial flights.

25. Aero-acoustic Simulations : Improving computational models to simulate and predict noise generated by aircraft in different conditions.

F. Space Habitats and Life Support Systems

26. Regenerative Life Support Systems : Researching systems that recycle waste and support life sustainably in long-duration space missions.

27. Advanced Thermal Control : Developing efficient thermal management systems for space habitats in extreme conditions.

28. Bioastronautics : Investigating the effects of long-duration space travel on human physiology and mental health.

29. Closed Ecological Systems : Designing self-sufficient systems for life support that mimic Earth’s ecological cycles in space.

30. Space Agriculture : Researching methods to grow food sustainably in space for long-term missions.

G. Aerodynamics and Flow Control

31. Flow Control Technologies : Investigating techniques to control airflow over aircraft surfaces for enhanced efficiency and performance.

32. Drag Reduction Methods : Research ways to minimize drag through innovative design and flow control mechanisms.

33. Supersonic and Hypersonic Aerodynamics : Understanding aerodynamics at high speeds and developing efficient designs for supersonic travel.

34. Unmanned Aerial Vehicles (UAVs) : Advancing aerodynamics specific to drone technology and their varied applications.

35. Biologically Inspired Aerodynamics : Studying aerodynamic principles in nature for innovative aircraft designs.

H. Satellite Communication and Networking

36. 5G and Beyond in Space : Researching the implementation of advanced communication technologies in space for higher data rates and improved connectivity.

37. Inter-Satellite Communication : Studying methods for satellites to communicate with each other, forming constellations for better coverage and data sharing.

38. Secure Satellite Communication : Developing encryption methods and secure communication protocols for satellite networks.

39. Internet of Things (IoT) in Space : Exploring IoT applications for connected devices in space-based systems.

40. Quantum Communication in Space : Investigating the application of quantum technologies for secure and high-speed communication in space.

I. Orbital and Planetary Mechanics

41. Formation Flying and Swarming : Researching the dynamics and control strategies for formations of satellites or spacecraft.

42. Space Traffic Control : Developing methods to regulate the traffic of spacecraft in congested orbits.

43. Planetary Landing and Mobility : Improving landing techniques and mobility systems for planetary exploration missions.

44. Orbital Dynamics of Small Satellites : Studying the unique orbital behaviors and challenges faced by small satellites.

45. Space Weather and its Effects : Understanding the impact of space weather on spacecraft and developing strategies for protection.

J. Aerospace Cybersecurity

46. Avionic Systems Security : Securing critical avionic systems from cyber threats and potential attacks.

47. Satellite Cyber Resilience : Developing resilient and secure systems for satellites against cyber intrusions.

48. Flight Control Systems Security : Ensuring the integrity of flight control systems from cyber threats and vulnerabilities.

49. Secure Communication Networks : Implementing robust Cybersecurity measures in Aerospace communication networks.

50. AI-Powered Cyber Defence : Utilizing AI and machine learning for real-time threat detection and response in aerospace systems.

The aerospace engineering field is continually evolving, with research topics continually adapting to technological advancements , societal needs, and environmental considerations. These emerging areas represent only a fraction of the diverse and dynamic research landscape within aerospace engineering. As technology progresses and new challenges arise, researchers will continue to explore innovative solutions, paving the way for the future of aerospace engineering.

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Aerospace engineering articles within Nature

Article | 31 July 2024

Passive wing deployment and retraction in beetles and flapping microrobots

We find that rhinoceros beetles passively deploy and retract their hindwings without muscular activity, demonstrating this with insect-like microrobots.

• Hoang-Vu Phan
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•  &  Dario Floreano

Article | 17 July 2024

Sunlight-powered sustained flight of an ultralight micro aerial vehicle

Solar-powered, untethered, sustained flight of an ultralight micro aerial vehicle under natural sunlight conditions is achieved using an electrostatic-driven propulsion system with a high lift-to-power efficiency.

• , Jinzhe Peng
•  &  Mingjing Qi

Article 30 August 2023 | Open Access

Champion-level drone racing using deep reinforcement learning

An autonomous system is described that combines deep reinforcement learning with onboard sensors collecting data from the physical world, enabling it to fly faster than human world champion drone pilots around a race track.

• Elia Kaufmann
• , Leonard Bauersfeld
•  &  Davide Scaramuzza

Article 19 October 2022 | Open Access

Accommodating unobservability to control flight attitude with optic flow

Attitude can be extracted from optic flow when combined with a motion model that relates attitude to acceleration direction, which leads to stable flight attitude control with slight oscillations due to unobservable conditions.

• Guido C. H. E. de Croon
• , Julien J. G. Dupeyroux
•  &  Franck Ruffier

Article | 21 September 2022

Aerial additive manufacturing with multiple autonomous robots

An additive manufacturing method using a team of autonomous aerial robots allows for scalable and adaptable three-dimensional printing, and is used to deposit building materials during flight.

• Ketao Zhang
• , Pisak Chermprayong
•  &  Mirko Kovac

Article 29 June 2022 | Open Access

Optimization of avian perching manoeuvres

To perch safely, large birds minimize the distance flown after stalling when swooping up from a dive to a perch, but not the time or energy required.

• Marco KleinHeerenbrink
• , Lydia A. France
•  &  Graham K. Taylor

Article 09 March 2022 | Open Access

Birds can transition between stable and unstable states via wing morphing

Analysis of inertial characteristics across 22 bird species shows that evolution has selected for avian manoeuvrability using both stable and unstable flight dynamics.

• , V. B. Baliga
•  &  D. J. Inman

Perspective | 26 January 2022

The challenges and opportunities of battery-powered flight

The economic, technical, environmental and safety requirements of battery-powered aircraft are considered, and promising technologies and future prospects for battery innovation are discussed.

• Venkatasubramanian Viswanathan
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Article 17 November 2021 | Open Access

In-orbit demonstration of an iodine electric propulsion system

The successful in-orbit operation of an electric space propulsion system based on iodine, rather than the more expensive and difficult-to-store xenon, is demonstrated.

• Dmytro Rafalskyi
• , Javier Martínez Martínez
•  &  Ane Aanesland

Article | 22 September 2021

Three-dimensional electronic microfliers inspired by wind-dispersed seeds

With a design inspired by wind-dispersed seeds, a series of three-dimensional passive fliers at the macro-, meso- and microscale are realized that can bear active electronic payloads.

• Bong Hoon Kim
•  &  John A. Rogers

Article | 02 December 2020

Autonomous navigation of stratospheric balloons using reinforcement learning

Data augmentation and a self-correcting design are used to develop a reinforcement-learning algorithm for the autonomous navigation of Loon superpressure balloons in challenging stratospheric weather conditions.

• Marc G. Bellemare
• , Salvatore Candido
•  &  Ziyu Wang

Letter | 26 June 2019

Untethered flight of an insect-sized flapping-wing microscale aerial vehicle

Sustained flight of an insect-sized flapping-wing aerial vehicle weighing just 259 milligrams that does not need to fly tethered to an off-board power supply is demonstrated.

• Noah T. Jafferis
• , E. Farrell Helbling
•  &  Robert J. Wood

Letter | 21 November 2018

Flight of an aeroplane with solid-state propulsion

A solid-state propulsion system can sustain powered flight, as demonstrated by an electroaerodynamically propelled heavier-than-air aeroplane.

•  &  Steven R. H. Barrett

Letter | 19 September 2018

Glider soaring via reinforcement learning in the field

A reinforcement learning approach allows a suitably equipped glider to navigate thermal plumes autonomously in an open field.

• Gautam Reddy
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Letter | 08 March 2018

Measurement of Jupiter’s asymmetric gravity field

Precise Doppler tracking of the Juno spacecraft in its polar orbit around Jupiter is used to determine the planet’s gravity harmonics, showing north–south asymmetry caused by atmospheric and interior flows.

• , W. M. Folkner
•  &  S. J. Bolton

Letter | 29 March 2017

Smart wing rotation and trailing-edge vortices enable high frequency mosquito flight

In addition to generating lift by leading-edge vortices (as used by most insects), mosquitoes also employ trailing-edge vortices and a lift mechanism from wing rotation, which enables them to stay airborne despite having a seemingly unlikely airframe.

• Richard J. Bomphrey
• , Toshiyuki Nakata
•  &  Simon M. Walker

Letter | 20 February 2017

Mechanical metamaterials at the theoretical limit of isotropic elastic stiffness

Finite-element models are used to identify a material geometry that achieves the theoretical bounds on isotropic elastic stiffness—a combination closed-cell cubic and octet foam.

• J. B. Berger
• , H. N. G. Wadley
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Space tourism to accelerate climate change

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Space capsule probed for asteroid dust

Hayabusa holds lessons for future sample-return missions.

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Origami that folds itself

Programmable sheet puckers up spontaneously into an aeroplane or a boat.

• Philip Ball

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