An explanation sheet for making a Plastic bottle helicopter

Materials and tools
A plastic bottle which has square cross section A BBQ bamboo stick A pair of scissors A cutter or a pair of pliers A tube of super glue
Method
Cut a plastic bottle like a picture below
Adjust the shape of the plastic sheet like a picture below.
Make a hole in order to put a BBQ bamboo stick in the middle of the plastic sheet. Push sharp edge of a bamboo stick in the hole and adjust the length of the stick with cutter or a pair of pliers. Apply super glue around the hole.
How to fly
Hold the helicopter between both hands. Slide your right hand toward you while the left hand remains in former position.
Caution: Please do not fly the helicopter where crowded with people