To start the conversation, I think we should immediately ask ourselves the following:
1) Given the performance observed, what sort of power generation technology could or could not be inside of these craft?
2) Is it even possible to build a 30ft - 40ft physical craft that can endure g-forces in the 10,000's? If not, does this force us to conclude it is some sort of warp drive and the craft isn't actually experiencing the forces the performance data would indicate?
I think that logical reasoning along these lines by experts might yield un-escapable conclusions that could inform us how they might work and how they can't possibly work, a start towards what we need to learn and might ignore along the way.