Hey, at least Terrafugia had a flying prototype and reasonable performance goals. Remember Moeller's Skycar? It was supposed to fly at 300+mph, burning 1 gph, with ducted fans. I asked him how he was going to overcome the drag of the ducts above 130 mph, and he had no answer. He never got his "car" off the crane, but he sure spent a LOT of OPM pursuing his "dream."