The document discusses a study conducted by NASA to determine the most drag efficient corrugation orientation for corrugated plastic rocket fins. The study involved testing six different fin designs - three with corrugations parallel to the leading edge and three with corrugations parallel to the root chord. Each fin was mounted on a torque sensor in NASA's Lifesaver Wind Tunnel to measure and compare the drag of fins with different corrugation orientations. The goal was to investigate whether corrugations parallel to airflow or parallel to the fin's leading edge experienced less drag.