And United Technologies, which makes Sikorsky helicopters, has flown a large model electric-helicopter powered by a hydrogen fuel cell.

ECONOMIST: Electric planes

It is almost enough to make you feel sorry for Europe's eighth richest man and his three yachts, several helicopters, bullet-proof limousines and model girlfriend.

BBC: Roman's Moscow homecoming

As a kid he built model aircraft, and as an adult he flies real ones, both fixed-wing and helicopters.

CNN: ASIANOW - TIME Asia