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.
The output of a wind turbine depends on the turbine's size and the wind's speed through the rotor. Wind turbines being manufactured now have power ratings ranging from 250 watts to 1.65 megawatts (MW). Example: A 10-kW wind turbine can generate about 16,000 kWh annually, more than enough to power a typical household. A 1.65-MW turbine can produce more than 4.7 million kWh in a year--enough to power more than 470 households. The average U.S. household consumes about 10,000 kWh of electricity each year.