4 ms·
The Dropion (+high-altitude balloon) was a "registered flight" so the air traffic control (or, specifically, Urad pro civilni letectvi) knew about this experime
by pavelczech 13y ago
The Dropion (+high-altitude balloon) was a "registered flight" so the air traffic control (or, specifically, Urad pro civilni letectvi) knew about this experiment. And then the seeds falling dow are really slow and light.