Today I built a jet powered rotor and it worked!! Yay me :) Or rather Yay Physics but I like to think it was my expertise that was the major factor in this success! I'm just kidding it was beautifully simple!
You will need two straws (I had pink and green) and some scissors. You cut one straw (the pink straw) so it is the same length each side of the bendy bit. Then you fold the end of the short side other straw (the green straw) in half lengthways so that you can squish it inside one end of the short pink straw. Now you bend the long green straw downwards and the short pink straw sidewards, put the long green straw in you mouth (don't hold it too tight) and blow! It will probably spin out of your mouth at this point but with a bit of practise you'll get better control! If you suck, nothing happens...This is because when you blow you push air out with a momentum which pushes the straw round. When you suck you pull air in from all different directions and because momentum has a direction the different directions will cancel out and there will be zero momentum to push the straw.
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