Wind tower erection and maintenance are costly because they generally require the work of a large, expensive crawler crane. But Barnhart developed a system for replacing damaged blades using its "crane-less single blade solution." The only crane required is a small rough terrain crane. Barnhart was contracted to replace a damaged blade on a 2.5 megawatt C-96 Liberty WTG for First Wind Energy. The wind turbine generator has a hub height of 80 meters and a rotor diameter of 96 meters. The task was to lift the C96 blade, which at the time was the largest blade used in the U.S. based on sail area and weight. The blade is 153 feet long and weighs approximately 33,000 pounds. So how did Barnhart conceptualize, engineer and design, fabricate, field test, validate, mobilize and execute this project for less than $150,000? They built a system to be used repeatedly, not just a single job.
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机译：风塔的安装和维护成本很高，因为它们通常需要大型昂贵的履带起重机的工作。但是Barnhart开发了一种使用其“无裂纹单刀片解决方案”来替换损坏的刀片的系统。唯一需要的起重机是小型越野地形起重机。巴恩哈特（Barnhart）签约为第一风能公司更换2.5兆瓦C-96 Liberty WTG上损坏的叶片。风力涡轮发电机的轮毂高度为80米，转子直径为96米。任务是举升C96刀片，根据帆面积和重量，C96刀片当时是美国使用的最大刀片。刀片长153英尺，重约33,000磅。那么，Barnhart如何以不到15万美元的价格构思，设计和设计，制造，现场测试，验证，动员并执行该项目？他们建立了一个可以重复使用的系统，而不仅仅是一项工作。
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