The steps to make a windmill are as follows:
1. Cut into a square: Fold the short side of the A4 yellow paper diagonally into a triangle, cut off the excess, and get a square paper .
2. Cut out the windmill leaves: Fold and flatten the diagonal lines, cut along the diagonal creases to 2/3, and cut out the windmill leaves.
3. Make a windwheel: The windmill leaves are spaced in order, and glued to the center of the square paper to make a windwheel.
4. The insertion of iron wire: Paste the white round paper in the center of the windmill, insert the iron wire through the white round paper in the center, and pass through the yellow paper tube.
5. Fixation of iron wire: After the iron wire passes through the small hole of the paper stick made of white paper, it is firmly fixed on the white paper stick.
Windmills are power machines that do not require fuel and use wind as energy. Early wind turbines were also called windmills. Modern wind turbines mostly refer to wind turbines used for power generation, and are also used to lift water for irrigation.
The ancient windmill developed from sails. It had 6 to 8 sail-like canopies, distributed around a vertical axis. When the wind blew, it rotated around the axis like a revolving lantern. , called a revolving windmill. Due to its low efficiency, this kind of windmill has been gradually replaced by wooden cloth windmills with horizontal rotating shafts and other windmills, such as "vertical windmills", "automatic rotor windmills", etc.
Ancient Chinese windmills
Ancient Chinese windmills have obvious characteristics. In addition to horizontal axles, the sails are sail-type. The sail is not mounted radially from the wheel shaft, but is mounted on eight poles around the shaft frame. The sail is again bias-rigged, that is, the canvas is narrower on one side of the pole and wider on the other side, and is tensioned with ropes.
When the wind acts on A, the sail is downwind, the sail is perpendicular to the wind direction (the force is greatest) and is tightened by the rope; when it is turned to position C, the sail is blown outward, and the sail surface is parallel to the wind direction. ; Return to position E and then resume the windward position. Using the tightness of the ropes and the bias of the sail, it can take advantage of wind or headwinds, just like in a ship's sail.