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You'd be surprised how small an object can produce a substantial vortex. I used to fly an electric acrobatic r/c model airplane (an Electrostreak, for those of you that know) and if the air was still, I could fly a very accurate loop, and if I flew right through the right spot, the plane would visibly drop about 6" as it flew through it's own wake. This is a 44" wingspan 35 ounce plane, by the way.
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