How close are we to having a powered, armoured, exoskeleton...

How close are we to having a powered, armoured, exoskeleton? What major roadblocks (besides a source of portable power) are preventing one from being made?

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none aside new batteries to power the suit.

The big thing is control mechanism.

You either need some kind of neural interface, or you need a machine learning system that can "follow" the movements of the person inside the suit, without accidentally breaking their legs/arms by making extreme motions.

How would a neural interface work? Would it be similar to a prosthetic?

Well if we want to take the movie as a bench mark, literally not even close.

He got shot out of the sky with a tank shell and it didn't even do anything to him.

retard alert

I didn't mean exactly like the movie, I just meant in general. Something similar.

Control systems aren't good enough, current exoskeletons require quite a bit of user energy to move.

Power sources are a problem for smaller suits but some crazy grad student could make a bigger suit (not gundam, think power loader) with a straight up combustion engine.

engineering undergrad alert

Something still has to absorb the force of projectiles, exactly as people shot wearing Kevlar get micro-fractures that kills them early. And of course if there were protective suits there would be bullets of the same material that could penetrate the armor.