Was reading that section earlier. Yes, the lack of DCAs in flat monotonous landscapes was interesting. Also that DCAs seem to need drones to become stable - too few in the air and they don't accumulate. It isn't clear what it is that holds them together - sight/sound of other drones or maybe even a pheromone, to return to Kitta's question.
Like hang gliders there may be a micro version of rising thermals caused by the local geography ?
There has to be something, the impression I got from their work in hilly areas was that they could pinpoint direction by "depletions of horizon" but couldn't explain why they stopped and congregated where they did.
Last edited by Thymallus; 29-01-2017 at 07:09 PM.
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