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Thermals only exist during the day, over land, and in suitable weather conditions. The record breaking glider flights do not rely on thermals, but on the upflow of wind blowing over a hill or mountain. That flow does continue at night, but depends on the weather conditions. The upflow extends to a much greater height than the hill itself. For example in the ...


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Wind will not help creating lift, because the drone's relative wind speed is zero. But it will glide down gently if the proper angle of attack on the blades is maintained. Same as a glider. Unless it is tethered to the ground or to another drone flying in a defferent weather with different wind speed, of course with constant automatic adjustment to create ...


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The bigger you are, the heavier you are and the tendency you have to need to fly faster and have a larger turning radius. One of things limiting the size of a sailplane is that you need thermals large enough and strong, or ridge lift strong enough to support you. "I assume that a computer controlled glider with sufficient weather information could fly ...


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