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well, by using two thermocol cups you can make very nice helicopters. for this you need
2 styro foam cups, colored tape and a cutter. with the help of cutter, first remove the
base of one of the styro foam cups. and then cut it into 4 equal parts. its now cut into
parts and you make 4 petals as shown. now take the second cup and smoothen out the base
with the cutter. it should be absolutely flat. now the second cup base is ready. now stick
some tape to the base and then stick all the 4 petals to it. the petals will form the wings
of the helicopter. after fixing the petals give them a little twist to convert them into
blades. this curvature will help your helicopter fly. and in the end you can of course decorate
it with colorful tape to make it much more interesting. if you throw it from the top
floor, your helicopter will come down spinning. its great fun for kids to make helicopter
and play with it.