I missed where they described how this was "Impossible"
"Researchers thought that an unattached vortex would be too unstable to persist in nature."
thanks
Dandelion Seeds Fly Using ‘Impossible’ Method Never Before Seen in Nature
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Re: Dandelion Seeds Fly Using ‘Impossible’ Method Never Before Seen in Nature
#12That was a lovely little diversion! There’s a brief 1 minute clip in the article that’s worth watching. I do have one question though, how is the air flowing up through? It the seed not falling for that to happen?
Yes, the seed is falling, but the vortex slows the fall enough for it to be useful in distributing the seed as far as possible.
Re: Dandelion Seeds Fly Using ‘Impossible’ Method Never Before Seen in Nature
#13I missed where they described how this was "Impossible"
"Dandelion seeds fly using a method that researchers thought couldn’t work in the real world [...] Researchers thought that an unattached vortex would be too unstable to persist in nature."
Re: Dandelion Seeds Fly Using ‘Impossible’ Method Never Before Seen in Nature
#14I always thought dandelion seeds were so open to reduce weight while still catching a decent amount of the wind in its cross section, approximating the flight of a dust particle.
Makes me wonder how much more of the wind a dandelion seed can catch with a vortex compared to if it didn't form one.
Re: Dandelion Seeds Fly Using ‘Impossible’ Method Never Before Seen in Nature
#15> Those structures act like the wings of a bird or aeroplane, generating pressure differences above and below the wing to fly. I thought we had settled this, airplane wings work by deflecting air downward, not by the Bernoulli effect, right?
They're different ways to describe the same phenomenon. "[B]oth 'Bernoulli' and 'Newton' are correct." https://www.grc.nasa.gov/www/k-12/airplane/bernnew.html
Re: Dandelion Seeds Fly Using ‘Impossible’ Method Never Before Seen in Nature
#16Does anybody have a link to a video of the lasers creating small vortices just above the dandelion surface?
Re: Dandelion Seeds Fly Using ‘Impossible’ Method Never Before Seen in Nature
#17Wow, new parachute designs may be possible then! They will look scary, but can be more effective.
Re: Dandelion Seeds Fly Using ‘Impossible’ Method Never Before Seen in Nature
#18Could we design better parachutes using this tech?
Re: Dandelion Seeds Fly Using ‘Impossible’ Method Never Before Seen in Nature
#19> Those structures act like the wings of a bird or aeroplane, generating pressure differences above and below the wing to fly. I thought we had settled this, airplane wings work by deflecting air downward, not by the Bernoulli effect, right?
Little of a, little of b. https://www.youtube.com/watch?v=aFO4PBolwFg
Re: Dandelion Seeds Fly Using ‘Impossible’ Method Never Before Seen in Nature
#20Wow, new parachute designs may be possible then! They will look scary, but can be more effective.
Ehhh, I imagine the seed/filament weight ratio is much closer than the human/filament weight ratio... if you blow this up to human size/weight proportions the filaments would likely need to be gigantic.