An explanation of the physics on how these craft operate can be found here:
http://calphysics.org
A more general population friendly explanation can be found here:
ET (UFO) Disclosure Series: #5 - BUILD YOUR OWN 'UFO'? - PUBLISHED PATENTS For Top Secret Flying Vehicles + US Air Force Design Whistleblower Speaks
An explanation of the physics on how these craft operate can be found here:
http://calphysics.org
A more general population friendly explanation can be found here: