The first attempt to launch the rocket was halted Saturday when a flight computer detected high pressure in an engine combustion chamber.

CNN: Historic launch of private rocket heralds new era

The XOS 2 is nearly usable for the latter job, but even at 50 percent more efficient than the original (by the company's last count) it's still a prototype that requires a tethered high-pressure hydraulic engine to function.

ENGADGET: Raytheon's Sarcos XOS 2 military exoskeleton just does the heavy lifting -- for now

The resulting high pressure, however, requires a big, heavy engine to contain it.

ECONOMIST: Monitor

The combination of turbocharging and high-pressure direct injection allows Ford to substitute a smaller engine for a bigger one.

FORBES: Los Angeles Auto Show: Ford Fiesta Rolls Out A Three-Cylinder Engine For 2013

Baidu has faced growing competition in its core search business from Qihoo, putting pressure the profitability of its once high-flying main profit engine.

FORBES: China Internet Consolidation Gets A New Push As Baidu Buys Online Video Vendor PPS

It is powered by an engine which drives a hydraulic pump to send oil under high pressure around its plumbing in order to animate its limbs.

BBC: BigDog four-legged robot now sports throwing arm