"very nice design concepts in that link. I totally believe the hoverbike idea is plausible if there exists any electric motors as powerful as needed to get it off the ground. a simple tricopter (with some U.I. changes needed) that probably a hobbyist…"
"I believe jets would have some issues also. From what I know their response time when throttling is very high, which would, once again, harm stability."
"yeah.. stabilization is a key factor and I can hardly see it happening with combustion engines. maybe it can lift off, but I would be skeptical of it's ability to safely fly."