"If you watch the video, a graphic says 12-18 weeks, though the voice over says 8 weeks"

"Fair enough. Some of those points I had considered and some I had not. I was more taking the tact of setting aside the problems to see what was left, but I was too generous I'll admit. I can't think of a realistic use case for this either as it is shown, but like John says below, maybe it ought to be a glider. Or maybe there could be some tangential application as a toy, or like a flying tethered elevator or something for firemen but my point is that especially "concept" work can have artistic value when it can surprise and then gets you to think about other new possibilities. Picking out the good parts and the bad parts can both facilitate that, not just the bad ones. "

"It is a new concept. How about giving it a little credit for being novel in your critiques? I notice so many comments on this site that read like some know-it-all type designer who is unconsciously masking their frustration that they did not themselves conceive of the new idea in question by overstating whatever flaws they can find and then disregarding the rest.What I see is a concept which takes the new developments in electric multi-rotor flying vehicles, along with all the interesting infrastructure trade-off debate and interest in Hyperloop, and offers a solution which removes the weight of the batteries from the electric flight efficiency equation. I'm not an engineer but that last part seems like it could be huge!It appears that it could carry many more people than a train because there is more room for it to operate up above trees and houses. It also might be much faster. The track seems like it could be cheaper and easier to build than a track which a train has to ride on. And lastly, it may or may not be as safe as a high speed train, we don't know, but I can't picture what the tether could get "snagged" on as it zips by as one commenter suggested. Perhaps the rail could even be built elevated high above obstructions since all it has to do is run power."