> bleed air is pretty hot. Initially yes. But then it can be cooled by expanding it or mixing it with cold air. This is pretty routine. After all the air you b

> bleed air is pretty hot. Initially yes. But then it can be cooled by expanding it or mixing it with cold air. This is pretty routine. After all the air you breath on airlines is coming from bleed air too. > it'll have just as many valves to control the flow of bleed air as a regular hydraulic setup Sure, but that's not the heavy stuff. The fact that bits of the wing has to be independently movable means that it has to be much heavier. If the whole wing would be just one piece you could presumably support it more efficiently.