LEGO flying helicopter!

Adam Woodworth has made the ultimate Lego construction: a helicopter that actually flies! The craftsman based his design on an already existing Lego set (6396 International Airport to be precise)

How? Lego is good stuff, but a simple model of a helicopter could never fly? He has put a quadcopter under the Lego helicopter to get it in the air. He actually cheated even more: the helicopter has the same look as lego, but they are not real. They would be too heavy and so he copied the blocks of hard foam material.