Maneuverability is one of the most important and least understood aspects of animal locomotion. The hydrofoil-like flippers of cetaceans are thought to function as control surfaces that effect maneuvers, but quantitative tests of this hypothesis have been lacking. Here, we constructed a simple hydrodynamic model to predict the longitudinal-axis roll performance of fin whales, and we tested its ...

The semi-active flapping foil driven by the swing arm is a simple structure to realize propulsion of foil. motion trajectory this mechanism circular arc, and its hydrodynamic characteristics are not clear. This paper systematically investigates working performance with arc track. Compared traditional structure, special design parameters mainly include length stiffness torsion spring. In paper, ...