IIT Madras Develops Bird-Inspired 'Morphing Skin' to Prevent Aircraft Stalls

Researchers at the Indian Institute of Technology Madras have developed a "morphing skin" for aircraft wings, inspired by bird flight, designed to prevent aerodynamic stall — the sudden loss of lift that occurs when airflow separates from a wing. The work, led by Dr Rinku Mukherjee of IIT Madras's Department of Applied Mechanics and Biomedical Engineering, was published in the European Journal of Mechanics – B/Fluids, a peer-reviewed Elsevier journal.

The system adds a flexible skin to the wing that reshapes itself in real time as airflow begins to detach, keeping the flow attached even at steep tilt angles. This lets the wing keep generating lift and limits drag, instead of the sudden stall that follows when airflow separates. The team built the skin using Macro Fibre Composite (MFC) strips, thin strips that sense airflow changes and reshape the surface in response.

Antony Samuel B, an IIT Madras alumnus, worked on the numerical modelling, while Dr Aritras Roy, also an alumnus, carried out wind tunnel experiments and co-authored the paper with Mukherjee. The concept was tested on a 3D wing with a standard NACA 4415 airfoil and validated through both computational models and wind tunnel experiments, and the researchers say it also works beyond conventional operating limits.

The researchers say the technology could help commercial aircraft take off and land more safely on busy or short runways, while the added lift and lower drag could cut fuel use and emissions. It could also improve the endurance and manoeuvrability of unmanned aerial vehicles and drones, and give pilots more control in turbulence or other adverse conditions.

Mukherjee said the underlying research is more than 20 years old, beginning as a study of separated airflow that the team has since turned into a physical device, experimentally validated and patented. The researchers say the system is now ready for implementation in real aircraft under real flight conditions.