1. Yep, that is pretty much how finger movement would have to be done. And probably other joints where practical. 2. Springs have a very poor energy density compared to other methods and this would not be practical. Relevant here to point out I have a BSME degree. Sorry. 3. EMDrive: Probably doesn't work. There needs to be a lot of evidence before it can be accepted. Photon propulsion is well known, the problem is that they are claiming a much higher force / efficiency than could be achieved with radiation pressure. Which is why it basically appears to violate the first law of thermodynamics. 4. " I came to the conclusion that the reason our mathematics were all wrong is because we adhere to a vehemently cartesian point of view " There are at least three statements in that sentence that are totally incorrect. 5. Relativistic speeds. We are going relativistic speeds - relative to the other side of the universe. It's moving away from us at nearly the speed of light and we are from it. Look up the Hubble Constant.
1. That's mostly where I got the idea, really. That's how most of our muscle groups work AFAIK. 2. I figured as much. Still a fun thought experiment. 3. I know it probably doesn't work. I'm saying that if it does, that might at least partially explain why. The EMDrive's shape would be to light what the cone shape is to chemical propellant. 4. Never said I was correct - that was me delving in things beyond my comprehension most likely. 5. Will do. Thanks!