Golf ball-like dimples to propel drones, submarines 30% farther, faster without fins

Engineers at the University of Michigan created a spherical prototype with adjustable dimples, reducing drag by up to 50% compared to a smooth sphere. Inspired by golf balls, the "smart skin" uses a vacuum pump to control dimple depth, adapting to airflow conditions. The technology enables steering without moving parts by creating asymmetric surfaces, potentially improving efficiency and maneuverability in underwater vehicles and drones, and possibly eliminating the need for fins or rudders.