Are two rotors better than one for harnessing wind power? Iowa State University researchers are testing new designs that could significantly increase the efficiency of wind turbines by adding a smaller, secondary rotor on the turbines. Using laboratory tests and computer simulations, two ISU aerospace engineering professors have found that those extra blades can increase a wind farm’s energy harvest by 18 percent. The Iowa Energy Center last year awarded the two researchers, Hui Hu and Anupam Sharma, a one-year, $116,000 grant to launch their study of dual rotors, a project that received the energy center’s 2014 Renewable Energy Impact Award. The National Science Foundation is supporting continued studies with a three-year, $330,000 grant. Read more about the research here.