Harvard University homepage
HARVARD.EDU

Flapping Foil Movies

Animals in Motion

Robotic Flapping Fin: Still Water

Robotic Flapping Fin: Self-Propelling

Robotic Flapping Fin: Heterocercal Tail

Bluegill Behind Flapper

Self-propelled swimming by a highly flexible plastic foil that produces multiple waves.
PIV (particle image velocimetry)

Self-propelled swimming by a highly flexible plastic foil that produces multiple waves.
PIV (particle image velocimetry)

Swimming of two rigid aluminum foils in series, used to investigate the hydrodynamic interaction between two swimming bodies.  
PIV (particle image velocimetry) 

Trout swimming in the vortex wake generated by an upstream heaving and pitching aluminum foil.  

Self-propelled swimming of a flexible plastic foil in the shape of a shark tail.