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 wind turbinesâ poor location and mechanical problems mean that it only produced 477 kilowatt hours in 2012 and 2013. Last year, the turbine only generated about $121 worth of power, meaning that it would take 405 years for them to pay for themselves.he town bought two wind turbines that will take more than four centuries to pay for themselves. The BBC reports that the two wind turbines installed in the English town of Rushcliffe will not likely produce any financial benefits for the town.