In science I started researching and found lots of good information. I found out that the wind has to be going towards the blades and it goes over the thick bit. Then it goes down the thin bit.The helicopter has to have the back rotor to fly and turn. takeoff of video. My favourite experiment was the coke rocket by Jack Ruthe what he had to do was shake the bottle with the coke in it then ram it onto the concrete so then the lid will pop off and make it fly really high.