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2. Whirligig - Wikipedia

   en.wikipedia.org/wiki/Whirligig

   Whirligig store. A whirligig is an object that spins or whirls, or has at least one part that spins or whirls. It can also be a pinwheel, spinning top, buzzer, comic weathervane, gee-haw, spinner, whirlygig, whirlijig, whirlyjig, whirlybird, or simply a whirly.

3. Bullroarer - Wikipedia

   en.wikipedia.org/wiki/Bullroarer

   Video of a bullroarer being swung to make a noise. A bullroarer consists of a weighted airfoil (a rectangular thin slat of wood about 15 to 60 centimetres (6 to 20 in) long and about 1.2 to 5 centimetres (0.5 to 2 in) wide) attached to a long cord. Typically, the wood slat is trimmed down to a sharp edge and serrations along the length of the ...

4. Pinwheel (toy) - Wikipedia

   en.wikipedia.org/wiki/Pinwheel_(toy)

   During the nineteenth century in the United States, any wind-driven toy held aloft by a running child was characterized as a whirligig, including pinwheels. Pinwheels provided many children with numerous minutes of enjoyment and amusement.

5. Spinning wheel - Wikipedia

   en.wikipedia.org/wiki/Spinning_wheel

   One of the attractions of an e-spinner is that it is not necessary to coordinate treadling with handling the fibre (drafting), so it can be easier to learn to spin on an e-spinner than a traditional treadle-style spinning wheel. E-spinners are also suitable for spinners who have trouble treadling or keeping their treadling speed consistent. [31]

6. Spinnaker - Wikipedia

   en.wikipedia.org/wiki/Spinnaker

   A spinnaker is a sail designed specifically for sailing off the wind on courses between a reach (wind at 90° to the course) to downwind (course in the same direction as the wind). Spinnakers are constructed of lightweight fabric, usually nylon, and are often brightly colored. They may be designed to perform best as either a reaching or a ...

7. Wind turbine design - Wikipedia

   en.wikipedia.org/wiki/Wind_turbine_design

   An example of a wind turbine, this 3 bladed turbine is the classic design of modern wind turbines Wind turbine components : 1-Foundation, 2-Connection to the electric grid, 3-Tower, 4-Access ladder, 5-Wind orientation control (Yaw control), 6-Nacelle, 7-Generator, 8-Anemometer, 9-Electric or Mechanical Brake, 10-Gearbox, 11-Rotor blade, 12-Blade pitch control, 13-Rotor hub