As the many drone-like flying vehicle prototypes have shown, there’s nothing fundamentally wrong with the idea of a vtol aircraft. Knowing what we do today abo

As the many drone-like flying vehicle prototypes have shown, there’s nothing fundamentally wrong with the idea of a vtol aircraft. Knowing what we do today about modern rotorcraft theory, it’s likely that the disc loading of the Moller prototypes was too high for the design to be practically efficient. It’s also likely that the Wankels didn’t perform anywhere near expectations for this reason... I don’t believe either of these to have insurmountable problems. Rather, it seems likely that a disproportionate amount of effort was sunk into the software for the flight controller before software development practices had advanced enough to make it practical; if I recall correctly there was something like 10’s or 100’s of millions of lines of assembly code involved... Just an idea that was ahead of its time, plagued by corporate missteps.