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Thanks for all of the info. I am actually thinking about using the solenoid in reverse--meaning i push the magnet through the coil and electricity is generated. I'm wondering if this would be more efficient than turning a generator (a motor in reverse) assuming both have the same power input.

What is the typical efficiency of a solenoid, neglecting friction? This would be a for a solenoid cycling very fast (with a spring or something to return it to the starting position). Or more importantly, what prevents a solenoid from being 100% efficient (neglecting friction)?. I've found...

I read that the Quaife has a spring in the middle of it...I'm not sure if thats true though. My idea isn't the same as the Torsen (I found an animation of that) or the Quaife or Eaton Truetrac. But it does have some similarities. I don't know how similar it can be and still get a patent. I...

I have invented (on paper) a limited slip differential that is completely geared and does not use any clutches, hydraulics, sensors, or electronics. It is simply a very unique arrangement of gears that has 1 input and 2 outputs. The outputs can spin at different speeds. As one output slows...