Electric power is beginning to be practical for short duration high performance flight - air racing and aerobatics. The electric motor and propeller assembly is lighter than the conventional gasoline engine/propeller - as long as the battery size is kept small enough that there isn't a weight penalty over conventional design, performance should be fine. This translates into ten or fifteen minutes of high power setting flying - sort of airshow or race length.
Several projects are underway.. here's one.
and here's a more heavily financed project with backing from Siemens. An existing Extra 300 is modified. The Extra 300 is a world class aerobatic mount
When Thomas Hicks, an American runner, faltered near the end of the 1904 Olympic marathon, in St. Louis, his assistants gave him shots of strychnine (which is now commonly used as rat poison) and brandy to revive him. Hicks crossed the finish line after another American, Fred Lorz—but was declared the winner when it was discovered that Lorz had ridden eleven miles of the marathon in his coach’s car. The perception was that Lorz had cheated, and Hicks had not.
I thought of Hicks on Sunday, when the International Olympic Committee announced that all Russian athletes would have to appeal to the international federation of their sport in order to gain eligibility to compete at next month’s Rio Olympic Games.