Speed fast ah this dialogue with the TOP14 of Speed almost

a professor talk about a general resistance of the aircraft to avoid as far as possible, but in fact sometimes the resistance of aircraft is sometimes useful, he proposed to refer to dragonfly, dragonfly can through the use of resistance, which can be suspended, or even increase inefficiency, two examples presented here, one of the helicopter flight direction is forward, however, was due to dangling dragonfly fag, resistance against each other. Here the topic and said that dragonflies flying helicopters and the difference between problems. And later cited an example of bees, bee wings as if to say stop earth, where the topic and that option on the keep moving wings I forgot. The ideas put forward questions and then asked Professor principle for the application of dragonfly flight attitude is. There are several options, a, dragonfly flight theory needs further study b, dragonflies flying in the future can be applied to aircraft in flight, and later can not remember