Testing was initiated in Jan 2002 on a small wind turbine designed for battery charging whichused a uniquely designed furling system. This downwind horizontal-axis wind turbine furls bythe tail lifting the rotor and alternator from a blade rotor horizontal-axis position to a blade rotorvertical-axis position (e.g. similar to a helicopter) at moderately high wind speeds. For Bushland,TX elevation -- 1159 m (3800 ft), the wind turbine began furling at a 13.5 m/s wind speed andwould be fully furled for wind speeds above 20 m/s. This 3.5-m diameter wind turbine had acut-in wind speed of 3 m/s and power peaked at 830 Watts (corrected to sea level, standard dayconditions) at a wind speed of 13.5 m/s. For a Rayleigh wind distribution with a mean windspeed of 4.5 m/s, this wind turbine generated 4.1 kWh/day (AC power) or 3.2 kWh/day (DCpower) at Bushland, TX.
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机译：测试于2002年1月在设计用于电池充电的小型风力涡轮机上启动，
使用了独特设计的收口系统。这台顺风水平轴风力发电机
尾部将转子和交流发电机从叶片转子的水平轴位置提升到叶片转子
在中等风速下的垂直轴位置（例如类似于直升机）。对于布什兰，
TX高程-1159 m（3800 ft），风力涡轮机开始以13.5 m / s的风速收起，
风速超过20 m / s时将完全收起。直径3.5毫米的风力涡轮机有一个
切入风速为3 m / s，功率峰值为830瓦（校正为海平面，标准天
条件）的风速为13.5 m / s。对于具有平均风的瑞利风分布
速度为4.5 m / s，该风力涡轮机每天产生4.1 kWh（交流电）或3.2 kWh /天（直流电）
电源）在得克萨斯州布什兰市。
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