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Secret Of
Walking On Water Discovered
Posted
on Thursday 07 August @ 17:10:54 |  |  |
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 If you have ever wondered how insects
like water striders walk on water or skim across the surface of
ponds, rivers and oceans, scientists in the United States have the
answer.
Rather than move by creating waves, as some
researchers had thought, the insects use one of their three sets of
hairy legs like oars to create vortices or spirals in the water that
propel them forward at speeds of up to 60 inches per second.
Professor John Bush of the Massachusetts Institute of
Technology and his colleagues who uncovered the secret said that
although tiny waves were created, they were not the main driving
force.
"The momentum transfer is primarily in the form of
subsurface vortices," Bush said in a report in the science journal
Nature.
Water striders, also known as skimmers, come in
hundreds of different species ranging in size from one centimeter
(about half an inch) to the giant Vietnamese variety -- 20 times
bigger and still able to walk on water.
The researchers
uncovered the secret by using sophisticated tracking and a
high-speed video camera that showed the curlicue patterns they made.
They also created a mechanical water strider, called
Robostrider, based on the real thing.
It is made out of a
drinks can, with stainless steel wire legs and an elastic band and
pulley as its middle legs.
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