From: http://www.wired.com/autopia/2013/06/e-fan-electric-airplaneA tiny ducted fan aircraft, only about 40 hp and it can do aerobatics, 1 hour touring around or about 30 min of loops etc.

People still say that battery technology is throttling eTech but I see huge amounts of work based an nano tech, material tech, graphene / carbon tech, etc which points to continued significant improvements in battery energy density etc for many years to come. Along with the rapid improvement in light strong structures, much of it fueled by carbon fibre technology, the improvements in electric propulsion, electronics, sensors, etc one wonders if the Jetsons are really all that far off…