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7

@tfb is correct: this is another form of ion propulsion, or generally, electric propulsion. A good general reference for electric propulsion is Fundamentals of Electric Propulsion: Ion and Hall Thrusters from JPL's DESCANSO series. The problem with electric propulsion using ultra-high exhaust velocities is the power required to drive the exhaust beam. If ...


5

I don't know the exact details of the Gemini suit, but here are some contemporaneous patents that describe similar joints. The different parts are in red and blue, bearings in green and o-rings yellow. Omni-directional high altitude helmet, US3030626A by Leonard F Shepard, filed 1958: It's basically a large ball bearing with an o-ring, both in such an ...


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