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You would also need to improve the thermal efficiency. In a modern fission power plant, about 1/3 of the energy is converted to electricity and 2/3 is just waste heat. Imagine having that sort of efficiency in a chest mounted reactor. Where are you going to dump all that heat?
We need a technological leap that is comparable to the jump from candles to LEDs.
Maybe reactor is based on cold fusion perhaps? So total fiction.
The arc reactor follows the rule of cool physics. That’s what dictates the, power density, size, shape and color.
Into the jets and repulsar beams...?
"Give me one sec cap, I've been standing still for 3 minutes so I have to go blast a hole in something real quick or my suit will explode."