Abstract: A compliant-surface flow-control device for reducing drag on objects moving through fluids is described. The device has a substrate having a plurality of ridges, a porous membrane covering the substrate, and interior spaces between the porous membrane and the substrate ridges.

Abstract: A motion dynamics recorder is provided, including a controller; a sensor array in communication with the controller, and configured for measuring at least one characteristic of the motion of a vehicle and/or its systems and environment; a memory module slot for receiving a removable, local memory module; and an optional, distal crash resistant case containing a remote memory module; wherein the controller is configured to generate data from the measurements and to write the data to the removable, local memory module, when the removable memory module is inserted in the slot, and/or the optional remote memory module.