Robotic suit could usher in super soldier era

"We see the value being realized when these suits can be built in great numbers for both military and commercial uses, and they start coming down in cost to within the range of the price of a small car," said Jacobsen. He declined to estimate how much the suit might cost in mass production.

But cost isn't the only obstacle. For example, developers eventually hope to lengthen the suit's backpack battery's life and tinker with the suit's design to use less energy. Meanwhile, the suit can draw power from a generator, a tank or helicopter. And there are gas engines that, while noisy, are small enough to fit into the suit's backpack.

"The power issue is probably the No. 1 challenge standing in the way of getting this thing in the field," Obusek said.

But he said Sarcos appears to have overcome the key challenge of pairing super-fast microprocessors with sensors that detect movements by the body's joints and transmit data about them to the suit's internal computer.

Much as the brain sends signals to tendons to get muscles to move, the computer sends instructions to hydraulic valves. The valves mimic tendons by driving the suit's mechanical limbs, replicating and amplifying the wearer's movements almost instantly.

"With all the previous attempts at this technology, there has been a slight lag time between the intent of the human, and the actual movement of the machine," Obusek said.

In the demonstration, the bulky suit slowed Jameson a bit, but he could move almost normally. When a soccer ball was thrown at him, he bounced it back off his helmeted head. He repeatedly struck a punching bag and, slowly but surely, he climbed stairs in the suit's clunky aluminum boots, which made him look like a Frankenstein monster.

"It feels less agile than it is," Jameson said. "Because of the way the control laws work, it's ever so slightly slower than I am. And because we are so in tune with our bodies' responses, this tiny delay initially made me tense."

Now, he's used to it.

"I can regain my balance naturally after stumbling — something I discovered completely by accident."

Learning was easy, he said.

"It takes no special training, beyond learning to relax and trust the robot," he said.

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