As wind farms expand into new areas they will need to withstand extreme wind speeds.
Some of the most dangerous forces to trouble turbine blades are torsion, or twisting, loads, says Find Mølholt Jensen, chief executive of Bladena, a firm that specialises in diagnosing and repairing large turbine blades around 60m in length, or longer.
While currently much smaller and less powerful than the biggest traditional, three-bladed turbines in operation today, Challenergy's device is intended to cope with very high winds. "We were inspired by palm trees," explains Lucy Pao at the University of Colorado Boulder. "In high winds they kind of go with the flow, they bend with the wind."
She shares the concerns of other observers who question whether wind turbines are really ready for some of the strongest winds nature can hurl at them. In this area, low wind speeds are common for most of the year - with the occasional hurricane blasting its way through.
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