After several years of research and testing, microvanes for the C-17 are in the process of airworthiness certification at the AFRL and the Air Force Life Cycle Management Center. Microvanes are small 3D-printed structures that attach to the aft-end of the fuselage. The fin-like shape helps redirect airflow in this higher drag area, streamlining the aerodynamics and reducing overall fuel demand by approximately 1%.
When installed across the C-17 fleet, including Air National Guard and Air Force Reserve aircraft, the Air Force estimates the microvanes will pay for themselves in fuel savings in seven months, and save over $10 million per year.