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The bottle turbine is an amazing toy designed by Durga a school student. All you need to
do is mount a freely moving turbine on a bottle lid. Here you can see this. There is a white
straw in the middle for the air to come out. There is the card sheet turbine which is mounted
on a flexi wire. If you blow through the lid air would come out and the turbine will rotate
very freely. Now you fix the lid to the bottle mouth. This is the whole assembly. And now
you stand the bottle upright and squeeze it repeatedly. Air would be expelled from the
white straw and it would spin the turbine. It is a very enjoyable game. Next you cut
the base of the green bottle and repeatedly move it up and down in a larger bottle filled
with water. As you move the green bottle down air would be expelled out from the white straw
and this would once again make the turbine spin. What a glorious toy! In the end you
just need to release the green bottle and it will sink down air will be expelled and
the turbine will spin. See this again.