So the latest issue of Kit Planes had a Paul Dye article on his SubSonex. Interesting article. He makes it pretty clear that building and owning a SubSonex is pretty much of a vanity thing - it's not a good XC machine, for instance. But that got me to thinking: These little jet engines are coming down in price and increasing in performance and reliability. Is a scale ME-262 with two of the SubSonex engines (PBS TJ-100 turbojet) at all feasible? Can you arrive at a scale and weight where: 1) A sea level standard sized pilot can fit comfortably and 2) Can you increase the fuel capacity to make it a good XC machine 3) Can you make it a 6+/4- G aerobatic airplane without increasing weight and what are the engine inlet issues with regard to aerobatics? The very first crude calculation is thrust to weight: Stock ME-262 thrust * 2 = 1,848 gross weight = 14,271 Thrust to weight = 0.26 - 0.28 Thrust taken from 109-004B Production-series engines with reduced weight and strategic materials. SubSonex: Thrust * 1 = 258.53 lb gross weight = 1000lbs Thrust to weight = 0.25852 Scale-262: Thrust * 2 = 517.06 gross weight = 2000 lbs Thrust to weight = 0.25853 (Obviously the same as the SubSonex since I doubled both Values) Similar thrust to weight. I wonder if one could get the weight down substantially? I think 2000 lbs is a conservative overestimate but I don't know that for sure. Certainly composites would help with that.