At the heart of this study is a simple yet mysterious observation: a disc-shaped piece of ice resting on an engineered metal plate unexpectedly launches itself forward as it melts. Ph.D. student Jack Tapocik first witnessed this phenomenon when ice, partially melting on a finely crafted aluminum surface, suddenly slingshotted across the plate without any visible external catalyst. This spontaneous motion defies ordinary expectations of how ice and water interact with surfaces, prompting a deep dive into the underlying physics and materials design that enable this unusual behavior.

The genesis of this research lies in the peculiar and long-standing enigma of the “sailing stones” found at Racetrack Playa in Death Valley, California. These large, flat boulders leave extended trails as if they are sliding across the cracked dry lakebed, an occurrence that mystified scientists and visitors alike for decades. It was Harvard geologist Richard Norris who demystified the phenomenon in 2014, revealing that a combination of hard clay soil, intermittent rainfall, freezing temperatures, and gentle winds creates ice rafts that coax these stones along. While Norris’s explanation resolved the natural mystery, Boreyko’s team took inspiration from this event to artificially recapitulate, and even surpass, the movement of ice through engineered surfaces.

The experimental design centered on fabricating aluminum plates embedded with asymmetric, herringbone-shaped grooves. These grooves, resembling a pattern of directional arrowheads, harness the flow of meltwater by channeling it predominantly in a single direction. As the ice melts, this directional flow of liquid beneath the ice disc propels it smoothly forward, akin to an object being carried by a river current. This clever approach leverages fluid dynamics principles at the interface between solid ice, liquid water, and the structured metal substrate to induce self-propulsion without any mechanical parts or external energy input.

Unexpectedly, the experiment revealed even more captivating dynamics when the team treated the herringbone grooves with a water-repellent spray. Contrary to expectations that this would speed up the ice’s glide, the ice disk unexpectedly adhered to the surface longer before snapping forward. This observation led to the discovery of what they have coined the “slingshot effect” — a phenomenon where the interplay between repellent coatings and meltwater flow builds up surface tension asymmetries creating a sudden, forceful release propelling the ice.

Dr. Boreyko explains that on these waterproof surfaces, meltwater is squeezed out from the groove peaks, sticking the ice to the ridges. The water still flows beneath the ice, but because the ice cannot glide with the water, tension accumulates along the front edge until it overcomes adhesion forces, causing the ice disk to catapult forward like a slingshot. This revelation underscores a subtle yet profound interplay of surface chemistry, fluid mechanics, and materials engineering to achieve motion in what would otherwise be a static melting process.

This artificial acceleration far outpaces the slow and steady migration of Death Valley’s sailing rocks and represents the fastest known movement of melting ice across a surface. The ability to tune motion speed and dynamics through surface patterning and chemical treatment holds significant promise for practical applications where controlled ice detachment or movement is desirable. It signals a paradigm shift in designing interfaces where phase changes, liquid flow, and surface structuring converge to produce emergent behaviors.

One particularly visionary application envisioned by Boreyko involves energy harvesting through rotational motion. By engineering the surface grooves into circular patterns, the ice could be made to rotate as it melts, triggering a continuous rotational movement akin to a self-powered turbine. Envisioning placing magnets atop the rotating ice disks, this paradigm could lead to novel methods of generating electricity directly from thermal gradients and phase changes, without the need for traditional mechanical inputs. This concept aligns with growing interests in low-impact, sustainable energy technologies that exploit fundamental physical processes in innovative ways.

The research represents the culmination of years of meticulous experimentation and modeling. Beginning with Boreyko and former graduate student Saurabh Nath in 2019, their effort spanned multiple phases including pattern design, surface treatment trials, and fluid dynamic analysis. The multi-disciplinary scope drew upon expertise in materials science, chemistry, physics, and mechanical engineering, illustrating the complexity inherent in translating natural phenomena into engineered systems. The long-term commitment exemplifies how basic curiosity fueled by natural puzzles can blossom into high-impact technological advances.

Collaboration was also a key element of the project’s success. Alongside Boreyko and Tapocik, team members included Saurabh Nath, now a tenure-track professor at the University of Pennsylvania, Sarah Propst, an undergraduate researcher who has progressed to Ph.D. studies at Johns Hopkins University, and Venkata Yashasvi Lolla, currently a postdoctoral research associate at UC Berkeley. This spectrum of contributors showcases the integration of emerging and established scholars in advancing frontiers of scientific research at the intersection of natural inspiration and human ingenuity.

Financial support from the John R. Jones III and the John Jones Faculty Fellowship enabled the team to carry this ambitious project from initial concept through to high-quality publication. Such investment in curiosity-driven research highlights the critical role funding agencies and academic fellowships play in fostering breakthroughs that may one day translate from the lab bench to real-world technologies impacting daily life.

Beyond its immediate applications, the study enriches scientific understanding of how interfacial phenomena can be harnessed for mechanical work. The interplay between surface morphology, chemical treatment, and fluid behavior presents fertile ground for future exploration, including the study of similar propulsion mechanisms in other phase-changing or soft matter systems. It opens an intriguing vista of scientific inquiry at the boundaries of physics, chemistry, and materials science, promising further discoveries inspired by nature’s intricate designs.

In summary, the work led by Jonathan Boreyko and colleagues is a striking example of how an ancient natural mystery catalyzed a breakthrough in engineered surface science. By deftly manipulating the flow of meltwater beneath ice and exploiting interfacial tensions via carefully patterned and treated surfaces, they have unlocked a mode of self-propelled ice motion with exciting technological implications. Their publication in ACS Applied Materials & Interfaces is set not only to capture the attention of the scientific community but also to inspire broader interest in the artful marriage of nature and technology.

Subject of Research: Propulsion of melting ice on engineered surfaces through asymmetric groove patterning and surface chemistry.

Article Title: (Not provided in the source content)

News Publication Date: 14-Aug-2025

Web References:

• Racetrack Playa, Death Valley National Park: https://www.nps.gov/deva/planyourvisit/the-racetrack.htm
• Explanation of Death Valley sailing rocks mystery: https://www.smithsonianmag.com/smart-news/researchers-solve-mystery-death-valleys-sailing-rocks-180952506/

Image Credits: Photo by Alex Parrish for Virginia Tech.

Keywords: Ice, Water, Chemistry, Physical sciences, Earth sciences, Water chemistry, Materials science, Physics, Ice melt, Conservation of energy, Energy transfer, Free energy

At the forefront of this innovative research is Assistant Professor Sameh Eisa from the University of Cincinnati, who has dedicated his efforts to understanding the intricacies of how albatrosses soar. With a substantial $700,000 grant provided by the Defense Advanced Research Projects Agency (DARPA), Eisa is leading a project aimed at transforming unmanned aerial vehicles (UAVs) through biomimicry—an engineering approach that draws inspiration from biological systems. Eisa’s research is centered on creating autonomous drones capable of replicating the impressive soaring capabilities of albatrosses.

Central to the albatross’s extraordinary flight is a technique known as dynamic soaring, which allows the birds to leverage varying wind currents effectively. This method involves a complex interplay of movement that includes tacking into the wind, gaining lift and altitude, and then cleverly utilizing gravitational forces to maintain speed as they glide downward. Eisa’s research team is pioneering a novel approach to dynamic soaring referred to as a “natural extremum-seeking system.” This groundbreaking methodology involves meticulously measuring the angles of pitch, yaw, and roll while simultaneously adjusting flight speed to optimize drone performance in real-time.

Utilizing both computer simulations and biological insights, Eisa and his collaborators have uncovered that these ancient birds can solve intricate optimization problems with astonishing proficiency. Through the use of sensitive nostrils, albatrosses can detect changes in wind speed and direction, allowing them to make delicate and precise adjustments to their flight patterns. Eisa emphasizes that this sensory capability is crucial for maximizing energy efficiency during both ascent and descent, enabling these birds to fly with remarkable stamina and agility.

The implications of applying these natural principles to drone technology are substantial. Eisa believes that if engineers can decode the principles governing the albatross’s flight, they can unlock unprecedented efficiency in drone operations. Traditional drone designs often struggle against the wind, but the objective of Eisa’s research is to transform these challenges into opportunities—enabling drones that can harness the wind with the same skill and prowess as their avian counterparts. By modeling albatross-like behaviors, future machines may achieve significant enhancements in both flight range and energy conservation.

In collaboration with industry experts and academic partners, including the Massachusetts Institute of Technology, Eisa’s project intends to validate the innovative design principles derived from albatross flight in real-world environments. Initial testing will focus on the efficacy of these new flight control systems, comparing energy consumption between drones using conventional flight techniques and those employing dynamic soaring techniques inspired by the albatross. Eisa expects this research to illuminate the energy-saving potential of mimicking nature’s designs in technological applications.

As Eisa and his students delve deeper into the physics of albatross flight, they access a wealth of evolutionary knowledge honed over millions of years. Nature has dictated optimal adjustments for efficiency, allowing albatrosses to accomplish the remarkable feat of traveling hundreds of miles weekly. By the end of their lifespans, these birds accumulate distances equivalent to nearly twenty times the distance from the Earth to the moon. Such astounding metrics emphasize the need to adopt nature-inspired engineering principles to enhance drone technology and expand flight capabilities.

Eisa’s work embodies the broader trend of biomimicry in aerospace engineering, where nature’s designs are increasingly viewed as valuable resources for solving human engineering challenges. By leveraging the advantages of flight perfected through evolution, Eisa aims to create drones capable of more sustainable operations. These efforts not only have potential applications in defense but may also revolutionize commercial UAVs, enhancing their performance, reliability, and energy efficiency.

Eisa’s research serves as a compelling reminder that the natural world continues to inspire cutting-edge technologies. The blending of aerospace engineering with biological insights highlights the exciting future on the horizon for autonomous flight. Researchers and engineers stand on the brink of creating drones that can soar as effortlessly as albatrosses glide over open waters, making the dream of sustainable, long-range flight a tangible reality. This endeavor is a testament to the ingenuity inspired by the natural world and the boundless possibilities that lie within the realm of aerodynamics.

Through rigorous testing and collaboration, there is the potential for a breakthrough in how we understand and implement flight technology. The albatross may well be the key to unlocking new frontiers in drone capabilities, ushering in a new era where UAVs harness the winds with the skill and efficiency of nature itself. The insights gained from studying these remarkable birds could redefine standards for energy-efficient flight and substantially advance the field of autonomous aviation.

Subject of Research: Biomimicry in aerospace engineering through studying albatross flight dynamics.
Article Title: Harnessing the Winds of Change: How Albatross Flight is Inspiring the Next Generation of Drones
News Publication Date: October 2023
Web References: University of Cincinnati News
References: Not specified.
Image Credits: Michael Miller

Keywords

• Aerospace engineering
• Biomimicry
• Dynamic soaring
• Autonomous drones
• Energy efficiency
• Optimization problems