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this straw turbine is the simplest rotating object. you need a stiff straw, a needle,
a tape and a little bit of copper wire. take a stiff straw and cut it about 2cms. make
a hole in the middle with a long needle. it should be a through and neat hole. then take
a few cms of copper wire and wind it on the long needle so as to make a small loop. weave
the other end of the wire through the hole in the spinner. the wire loop will act like
a stopper. now on the other end of the wire make another similar loop by winding it on
a needle. on two ends there will be two loop stoppers. this makes the wire axle on which
the spinner will spin. you can see the spinner ready with the axle. now make a small hole
in the stiff straw and weave the long copper wire through it. take a bit of tape and tape
the wire to the straw. this way spinner will be attached to the blowing pipe. ensure that
the spinner rotates freely. if you blow the small straw spinner will spin very fast. if
you want you can also make a turbine with four blades. you can see its spinning very
freely.