当直升机可用功率不足以维持地效外悬停时，直升机可以利用地面效应增速至一定前飞速度完成起飞。研究了地面效应和前飞速度对直升机剩余功率的影响，阐述了利用剩余功率进行有地效起飞的原理。介绍了3种有地效起飞方式，并使用水平加速—定速爬升法进行了起飞性能飞行试验，得到了水平越障距离随爬升速度的变化曲线，对飞行试验结果进行了分析，得到了有益的结论。%Helicopter can accelerate to a certain forward velocity and conduct a takeoff utilizing the ground effect, when the power available is insufifcient to maintain the hover out of ground effect. The effect of ground effect and forward velocity on excess power and the principles of taking off with ground effect based on excess power were investigated. Three different methods of taking off with ground effect were introduced and takeoff performance lfight test was conducted using level accelerate—constant velocity climb trajectory, the change curve of level distance over the obstacle with climb velocity was shown to analyze the lfight test results and beneifcial conclusion was obtained.
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