PerspectiveBiomimetics

Tuna fin hydraulics inspire aquatic robotics

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Science  21 Jul 2017:
Vol. 357, Issue 6348, pp. 251-252
DOI: 10.1126/science.aan8354

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  • Tuna has efficient hydrodynamic multiple small fins for stability

    Michael S. Triantafyllou described "tuna fin hydraulics inspire aquatic robotics " (1). During the late 18th century, wing designs were based on anatomical studies on dolphins, trout and tuna by the “father of aerodynamics”, Sir George Cayley (2,3). Fish that are adapted for fast swimming, like tuna, are generally fusiform in shape and this is considered an efficient, hydrodynamic shape (4,5). The hydraulic-fin-manufacture utilized multiple small fins instead of large hydraulic fins through the experiment for adopting better boat stabilizers (6). By using two, four or six smaller active fins grouped together, the more small fins system produces better results without causing drag and slowing boats (6). Tuna has such efficient hydrodynamic multiple small fins including 1st dorsal fin, 2nd dorsal fin, finlets, caudal fin, pelvic fin, pectoral fin, and anal fin.

    References:
    1. Michael S. Triantafyllou, Tuna fin hydraulics inspire aquatic robotics, Science, 21 Jul 2017, Vol. 357, Issue 6348, pp. 251-252
    2. Bio-mimetic Drag Reduction – Part 2: Aero- and Hydrodynamics, March 31, 2012
    http://aerospaceengineeringblog.com/bio-mimetic-drag-reduction-2/
    3. https://en.wikipedia.org/wiki/George_Cayley
    4. Eric Pickhartz, The ‘Tuna Robot’ is the Navy’s Newest Underwater Drone, July 4, 2014
    ...

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    Competing Interests: None declared.