Howe May 30, 2019 01:55 AM Impressive, its about time hydrogen fuel cells take flight. Batteries are better for cars, but unless they have a big breakthrough, hydrogen will likely hold the energy density lead for another 15-20 years. CAVUMark May 30, 2019 02:14 AM "turns the every day commute into a fascinating experience"... shissh, the marketing people are working overtime. Nice looking product though. erl May 30, 2019 05:23 AM I hope they build in an airplane parachute called CAPS :) Vanilla Cat May 30, 2019 05:40 AM The FAA will NEVER permit these flying Ginsu Knives to crowd the skies above populated areas. pATREUS May 30, 2019 07:38 AM There is far more air space available than tarmac roads. Solutions like these (with reliable traffic control) will eradicate travel congestion. Knut May 30, 2019 07:50 AM The hydrogen tanks are heavy - but why not use more Norwegian technology: the Wankel engine works fine with hydrogen and is smaller than the fuel cells and much lighter. "burning" is when hydrogen binds with oxygen and produce clean water. The efficiency of the motor is just slightly less than fuel cells, but place funding on the table, prototypes have this with much better efficiency. Look at the chemical structure of the hydrogen atoms and you will see that nothing can beat it - ever. A VTOL would be more convincing and should give a better distance. They fitted the Wankel on a boat, and a tiny engine pushed the boat close to flying. So what about a plane - should be a better mix. David Evans May 30, 2019 08:26 AM Vanilla Cat, what do you think happens to a helicopter when it loses its tail rotor over a populated area? Brian M May 30, 2019 08:31 AM Nice to see Hydrogen taking off (pun intended!). Its a technology that has unfortunately been eclipsed by battery technology that replaces one problem (CO2) with others such as how to supply enough battery storage and how to recycle used batteries. Hydrogen is a great alternative if the supply issue can be dealt with. grtblu May 30, 2019 09:39 AM As Boeing's Max 8 troubles show, single points of failure in aircraft are unacceptable. This aircraft has 4 propellers, if one drive fails, can the thing be controlled? The configuration means that a pilot doesn't actually fly the machine a computer does. These things fly like a powered brick with a glide path of zero. So what redundancy exists in the computer controls to deal with software and hardware failures? These are great concepts, have interesting futures, but need real engineering including detailed FMEA's (that's Failure Modes and Effects Analysis) to make them safe. That being said, it looks fantastic. guzmanchinky May 30, 2019 11:41 AM So many companies developing these machines, I hope they become reality soon. It would be nice to own a "helicopter" that doesn't require the training and counter intuitive lightning fast reflexes to fly one, and which can accommodate a ballistic parachute.