A biomimetic robotic fish created by Yahya Modarres-Sadeghi at the University of Massachusetts in Amherst and colleagues can accelerate a speeds of up to 4 gs.
(Very quick robotic fish)
A startled pike can accelerate at about 15 g for a tenth of a second. A robot with that kind of acceleration could be well suited to covert operations or navigating turbulent water.
The team built a 50-centimetre-long rubber fish modelled on a member of the pike family called the chain pickerel. Running lengthwise inside was a metal strip bent into a C-shape and kept that way by a clamping mechanism. When released by an external pneumatic actuator, the potential energy of the bent strip is converted into kinetic energy, causing the model's tail to whip one way and then the other.
Under water this resulted in an acceleration of just over 4 g, eight times that achieved by previous robotic fish.
In his 2002 story Slow Life, science fiction author Michael Swanwick writes about robot fish who help explore distant worlds:
Consuelo carefully cleaned both of her suit’s gloves in the sea, then seized the shrink-wrap’s zip tab and yanked. The plastic parted. Awkwardly, she straddled the fish, lifted it by the two side-handles, and walked it into the dark slush.
She set the fish down. "Now I’m turning it on."
The Mitsubishi turbot wriggled, as if alive. With one fluid motion, it surged forward, plunged, and was gone.
(Read more about the robot turbot)
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'What strange sensitivity! What an amazing development of science was manifested in every move and act and word of this Robot!' - Ray Cummings, 1931.
DIY Robot Scorpion Crushes It
'...it raised its front end off the ground and waved its antennae at them, then raised one armoured claw as if to snip them out of the sky.' - Neal Asher, 2008.
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'What strange sensitivity! What an amazing development of science was manifested in every move and act and word of this Robot!'
Orb Nomad Zero-Emission Electric Aircraft
'That explains how it was so easy for me to remain motionless in midair or to perch on a flagpole in imitation of a giant bird, even in the windy city of Chicago.'
DIY Robot Scorpion Crushes It
'...it raised its front end off the ground and waved its antennae at them, then raised one armoured claw as if to snip them out of the sky.'