Phantom Twist: the drone that becomes invisible to the eye with motion blur

Researchers at Northwestern University in Illinois have developed a drone called 'Phantom Twist', a prototype that utilizes the principle of motion blur to render itself almost invisible. The device, presented at the Robotics: Science and Systems 2026 conference, relies on the rotation of its chassis at a speed of 25 times per second, transforming into a faint spot in the air to the human eye.

Michael Rubenstein, head of the project at Northwestern University, explained the philosophy behind this innovation. While much of the effort to conceal drones focuses on blending in with the surrounding environment, the team chose a different approach. The research focused on human perception of motion, exploring the idea of low visibility achieved through persistent and rapid movement, a concept that has been little investigated thus far.

The design of the 'Phantom Twist' diverges significantly from traditional quadcopters: unlike conventional setups, the drone employs a single motor and a single propeller. The distinguishing feature lies in the fact that the propeller spins in one direction, while the main body of the drone rotates in the opposite direction, contributing to the dynamic blur effect that reduces its visual perceptibility.

AI at the Service of Invisibility with Phantom Twist

The design phase of the 'Phantom Twist' greatly benefited from artificial intelligence and advanced computational models. The researchers tasked a computational model with generating about 20,000 possible drone configurations, all capable of ensuring stable flight. Subsequently, optimization algorithms and artificial intelligence were employed to rearrange key components, such as the motor, propeller, electronic board, counterweight, and batteries, progressively refining the design.

After narrowing down the candidates to around 500, engineers overlaid simulations of the drones in flight against a hundred real-world backgrounds. A perception model then discarded designs based on their visibility scores. Rubenstein emphasized that the entire process was automated: physical drones were built only when the model confirmed that all design criteria were met. According to the visibility metrics used by the researchers, the 'Phantom Twist' is ten times less visually perceptible than a conventional quadcopter.

Despite significant advancements, the team is aware of the current limitations of the prototype. The 'Phantom Twist' is quite noisy, and the visual impact of wires and support rods could be further reduced. For future revisions, targeted interventions are already planned to utilize more transparent materials and implement quieter propulsion systems, aiming to further refine the illusion of invisibility.