Boeing's 787 Dreamliner grabs attention for its composite structure, but its systems are just as radical. The aircraft is a large step toward the all-electric airplane--one in which all systems are run by electricity. Bleed air from the engines has essentially been eliminated and while hydraulic actuators are still used, the majority of their power comes from electricity. The most eye-popping change is that the cabin will be pressurized by electric motors, not by the bleed air used ...

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