Scientists build carbon fibre structures that boost drone flight time by 33%

Researchers at Seoul National University have developed continuous carbon fibre lattices that deliver aluminium-level strength at one-hundredth the weight. The implications extend across multiple industries including aerospace, mobility, robotics and transport.

Strong, lightweight materials are critical for applications such as drones, robotics, vehicles and aerospace systems. Conventional carbon fibre composites provide excellent strength-to-weight performance but are typically made by stacking layers or assembling multiple parts, which limits design flexibility and creates weak interfaces. Even advanced 3D-printed composites rely on layer-by-layer fabrication, introducing internal boundaries that hinder load transfer and force a compromise between structural complexity and mechanical reliability.

Researchers at Seoul National University have developed a new class of ultralight structural materials that combine the load-bearing strength of engineering materials with the weight of foam. Using a method called 3D node winding, the team created mesoscale carbon fibre lattices that achieve aluminium-level performance on a strength-to-weight basis while weighing as little as 1/100 the weight of aluminum.

The findings, published in Nature Communications, demonstrate a new way to build strong, lightweight structures without the need for joints or layered assembly. The approach removes one of the key bottlenecks in structural design: the need to assemble complex three-dimensional forms from discrete parts. Instead, structures are created as continuous systems, enabling both geometric complexity and mechanical integrity to be achieved simultaneously.

Building structures from a single continuous fibre

Instead of assembling or stacking materials, the research team defined the structure by placing a single continuous carbon fibre directly in three-dimensional space, a unifying concept that “binds them all together in perfect unity.

The process begins with a temporary scaffold that defines nodal geometry. A long carbon fibre is then wound across these nodes, forming a spatial lattice network. Once the geometry is established, the structure is consolidated through resin impregnation, producing a solid composite. Because the fibre remains continuous throughout the structure, forces are transmitted without interruption, avoiding the stress concentrations and failure points commonly associated with joints and interfaces.

The new carbon fibre lattice structures achieve compressive strengths of 10–30 MPa, comparable to concrete, while delivering aluminium-level strength-to-weight performance at a fraction of the mass. Thanks to their continuous load paths, they can be up to ten times stronger than conventional lattice structures of the same weight by distributing forces more efficiently and minimising inactive material.

Toward scalable, design-driven structures through robotic

To validate the approach in a real-world system, the researchers applied the structure to a drone frame. The redesigned frame reduced structural weight by approximately 79 percent compared to conventional designs. This reduction directly resulted in a 33 percent increase in flight time under the same operating conditions. These results confirm that structural weight reduction translates directly into improved system-level performance, particularly in applications where mass is a primary constraint.

Beyond improving material performance, this approach redefines structural design by using continuous fibre paths instead of assembly or layering, making it possible to optimise geometry and load distribution simultaneously while enabling scalable production through robotic, digitally driven manufacturing.

The spatial complexity of continuous fibre architectures has limited their scalability in conventional manufacturing,” said Dr Jun Young Choi and Prof. Sung-Hoon Ahn. “With advances in robotic and AI-driven fabrication, these structures can now be produced at scale, and this work provides a roadmap for their practical realisation.”

The implications extend across multiple industries where weight and efficiency are critical. In aerospace and mobility systems, reducing structural mass improves range, payload capacity and energy efficiency. In robotics, lightweight yet stiff structures enable faster actuation and improved precision. In construction, the approach opens pathways for material-efficient load-bearing frameworks that reduce material usage while maintaining structural integrity. More broadly, the method supports a transition from component-based engineering to integrated structural systems defined by geometry, continuity, and automated fabrication.

Cover photo: Prototype structures developed by the research team (drone, robotic arm)

source: Seoul National University

credits : JECCOMPOSITES