I am not an aerospace engineer, so take my comments with a grain of salt. This will not really scale to the commercial airliner market. The author got most of

I am not an aerospace engineer, so take my comments with a grain of salt. This will not really scale to the commercial airliner market. The author got most of his improvements out of propeller efficiency, and propellers are very efficient. However, they don't scale to jet speeds. I am not at all certain that an efficient electric powered jet engine could be produced (I suspect the physics just won't support it). If you are willing to take a step back and use hydrogen, I am very willing to believe that an efficient hydrogen powered jet engine could be built, but that would be completely new technology and I would bet it would take decades before it were available even if someone were to start working on it immediately. Besides, it is not clear to me what the advantage of using hydrogen over jet fuel would be. By weight, the energy density is higher, but by volume it is much lower.