Robot Jumps On Water Like Water Strider

Posted: Jul 31 2015, 8:10am CDT | by , Updated: Jul 31 2015, 8:43am CDT, in News | Latest Science News


Robot Jumps on Water like Water Strider
Seoul National University

Scientists create a tiny robot that jumps on water like water striders. Watch the incredible video.

Korean researchers led by Sung Koh have created a robot that can launch itself from the surface of water. 

The scientists copied the skills of water striders observing their movements with high-speed cameras stealing their secrets.

The secret of the water striders is that its long legs accelerate gradually. This way the water surface doesn't retreat too quickly and lose contact with the legs. 

Using a theoretical model of a flexible cylinder floating on liquid, the authors found that the maximum force of the water striders' legs is always just below the maximum force that water surface tension can withstand. 

The researchers used a torque reversal catapult (TRC) mechanism that generates a small initial torque and gradually increases, but that never exceeds the surface tension force of water. 

The water strider sweeps its legs inward in order to maximize the time the legs can push against the surface of the water, thus maximizing the overall force.

The robot is also copying this behavior to jump on water like its biological archetype.

The paper "Jumping on water: Surface tension-dominated jumping of water striders and robotic insects" has been published  in the Journal Science.

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The Author

<a href="/latest_stories/all/all/2" rel="author">Luigi Lugmayr</a>
Luigi Lugmayr () is the founding chief Editor of I4U News and brings over 15 years experience in the technology field to the ever evolving and exciting world of gadgets. He started I4U News back in 2000 and evolved it into vibrant technology magazine.
Luigi can be contacted directly at




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