dolphin - The Hydrodynamic Secret of the Dolphin G. I....

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The Hydrodynamic Secret of the Dolphin G. I. Svyator 1969 Scientists Discover Secret of Dolphin Speed – Ocean Research, 2004
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Power = Power = Drag Drag x Velocity x Velocity Velocity = 33 ft/sec (10 m/s*; Re = UL/ ν = 1.8x10 7 ) Drag = C D ½ ρ U 2 A Area = 15 ft 2 (6-ft long, 200 lbs, 35 lbs of muscle) C D = f (Re) hp/lb of muscle = 0.074 (turbulent – 0.25 if U=15m/s) hp/lb of muscle = 0.009 (laminar) hp/lb of muscle = 0.01 (men, dogs – prolonged activity* )
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Human ingenuity may make various inventions, but will never devise any inventions more beautiful, nor more simple, nor more to the purpose than Nature does; because in her inventions nothing is wanting and nothing is superfluous. . (Leonardo da Vinci 15 th Century)
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Cayley (circa 1809) “We should be deriving our boat from a better architect than man, and should probably have the real solid of least resistance” Shape of dolphin compared to air foil Drag Reduction Strategies : Streamlined shape
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Relative sizes of wire and streamlined airfoil for the same drag (speed = 210- mph) Trout
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Large Drag Small Drag
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1903 – Wright Brothers 1950’s – high speed fighter
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This note was uploaded on 04/26/2010 for the course MAE 101B 101B taught by Professor Rohr during the Summer '09 term at UCSD.

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dolphin - The Hydrodynamic Secret of the Dolphin G. I....

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