Porcupines' quills, or spines, take on various forms, depending on the species, but all are modified hairs coated with thick plates of keratin, and embedded in the skin musculature.
Produce up to 400-Watt of power for free in your own back yard. The wind turbine will produce more power up to 400-Watts at 28 mph. If the wind dies down the turbine will continue to produce power in winds as low as 5.6 mph. This wind generator is used to charge 12-Volt batteries and mounts on any 1.5 in. Schedule 40 pipe.
Wind turbines come in different sizes. Small turbines have rotors from three to 50 feet in diameter. Their towers reach up to 130 feet high. They can generate up to 20 kilowatts of electricity and are used to power homes, farm equipment, and small villages.