"The best way to get a jump-start is tofly on the wings of larger players, " says youngest sibling Rajan Mittal, articulating the brothers' philosophy.
The Solar Impulse is powered by about 12, 000 photovoltaic cells that cover massive wings and charge its batteries, allowing it tofly day and night without jet fuel.
With their wings beating up to 80 times a minute and their hearts beating hundreds of times a minute, they fly up, down, forwards and even upside down and backwards.