> This is in contrast to all modern turbines, those built after ~2005, which is to say, well over 99%, it can take over 15 seconds for a blade to sweep through

> This is in contrast to all modern turbines, those built after ~2005, which is to say, well over 99%, it can take over 15 seconds for a blade to sweep through one revolution. Getting hit by one of these blades is unfortunate, but causes significantly less damage. If the blades turn slowly, too much wind passes through the gaps between the blades without interacting with the turbine. Although modern turbines may appear to be turning leisurely, because of their scale the blades are traveling large distances on each revolution resulting in high impact speed. The latest land based turbines being made by GE have a rotor circumference of 0.3 miles[1]. Modern turbine blades reach speeds of 180 miles per hour at their tips.[2,3] The blades of new turbines travel so fast that erosion of the blades is a serious problem. [1] https://www.ge.com/renewableenergy/wind-energy/onshore-wind/turbines/cypress-platform https://www.ge.com/renewableenergy/wind-energy/onshore-wind/... [2] http://www.acua.com/uploadedFiles/Site/About_Us/WindFarm.pdf http://www.acua.com/uploadedFiles/Site/About_Us/WindFarm.pdf [3] https://gizmodo.com/the-worlds-biggest-wind-turbine-blades-are-so-long-thei-5930272 https://gizmodo.com/the-worlds-biggest-wind-turbine-blades-a...