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I know this will turn into a heated discussion about the 2nd Law of Thermodynamics, so I will just state the facts as I understand them. The question is: can a battery be charged by any amount via the following method? Facts: 1) This research paper about photovoltaic infrared detectors...

Found some videos of variable field motors online... seems to achieve the same desirable properties as continuously variable transmissions with reduced complexity. With the stator inserted, one gets max torque per amp, and with the stator retracted, one gets max rpm per volt...

There is a physics problem called the "Brachistochrone problem" which seeks to identify the "path of quickest descent" for a frictionless body on a ramp with the only force acting being gravity. For bodies with 0 initial velocity, the problem was solved centuries ago by Isaac Newton. The...

Revised Land Based Oberth Maneuver Vehicle: Original Land Based Oberth Maneuver Vehicle: -------------------- I've completed a basic comparative analysis of the 2 options and found that in essence they are equivalent in terms of efficiency, but the revised version is more practical since the...

I am trying to estimate how much electromagnetic drag a coasting, magnetically levitated vehicle in a vacuum will experience. I was looking at a paper describing the use of null flux coils for electrodynamic suspension. I was confused by one of the charts in the paper... it appeared to show...

I've been researching a land vehicle concept that takes advantage of a maneuver more commonly used in spacecraft propulsion-- the oberth maneuver. A more complete discussion of the physics can be found here: Land Based Oberth Manuever? I hope it can be built one day because it uses only...