Home / News / Technology news /

Swimming Robot Tests Theories About Locomotion

An underwater robot is helping scientists understand why four-flippered animals such as penguins, sea turtles and seals use only two of their limbs for propulsion, whereas their long-extinct ancestors seemed to have used all four.

Posted by C1ay
30 May, 2006 07:05:42

print article
A | A | A

When researchers put a joystick-controlled robot named Madeleine through her paces, they found that her top cruising speed did not increase when she used four flippers instead of two--apparently because the front flippers created turbulence that interfered with the rear flippers' ability to generate forward propulsion. Maintaining the same speed with four flippers also took significantly more energy. But Madeleine was able to make quicker starts and stops with all fours.

Results from experiments such as these aid engineers in designing underwater autonomous vehicles and help scientists understand why certain traits survived over others during the process of evolution.

Scientists who study fossils of four-limbed aquatic dinosaurs, such as plesiosaurs, say the shape and musculature of their appendages suggests they used all of their flippers for locomotion. But over time, the benefits of two-flippered swimming won out. Extrapolating from experiments with Madeleine, scientists hypothesize that plesiosaurs benefited from using all fours to ambush prey.

Madeleine was developed by Vassar College's John Long and his colleagues at Nekton Research, LLC (Durham, N.C.) through support provided by the National Science Foundation's (NSF) Collaborative Research at Undergraduate Institutions program and the Major Research Instrumentation program.

Source: National Science Foundation

Comments (1 posted):

ronthepon on 30 May, 2006 12:19:42

Interesting article. It would help conceptually in building a underwater locomotive which could 'hide' and 'show' it's front fins, maybe by having them close into the sides.