Physics FTW

"You can tell a Finn but you can't tell him much" (youcantellafinn) 03/25/2015 at 16:05 • Filed to: physics, slomo guys

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Very cool super slo-motion video of a CD being spun until its burst speed. The standing wave that forms shortly before it bursts is pretty cool. Crack propagation occurs at a crazy fast rate too.

ttyymmnn > You can tell a Finn but you can't tell him much 03/25/2015 at 16:22

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That's pretty amazing. What are they putting it on that spins that damned fast?

You can tell a Finn but you can't tell him much > ttyymmnn 03/25/2015 at 16:25

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A vacuum cleaner motor. I think he said it was out of a Dyson.

ttyymmnn > You can tell a Finn but you can't tell him much 03/25/2015 at 16:31

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Thanks. I skipped ahead to the interesting bits. Really wild.

Dingers Ghost, Champion Jockey > You can tell a Finn but you can't tell him much 03/25/2015 at 16:53

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So they can spin up to 23k RPM.

But they'll skip anytime I hit a pothole.

You can tell a Finn but you can't tell him much > ttyymmnn 03/25/2015 at 17:06

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notice how the disc was spinning faster than the standing wave at the end?

ttyymmnn > You can tell a Finn but you can't tell him much 03/25/2015 at 17:13

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I didn't, but that's pretty wild. I was blown away by how distorted it got before it blew.

Leon711 > You can tell a Finn but you can't tell him much 03/26/2015 at 11:12

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Dyson Motors are beasts. Here's one I mated to a turbo.

You can tell a Finn but you can't tell him much > Leon711 03/26/2015 at 13:29

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For the lulz or did this get used in a project?

Leon711 > You can tell a Finn but you can't tell him much 03/26/2015 at 14:59

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I'll conceived first year university project, never fitted to engine but ran up a few times. Eventually ripped itself apart. I was laughed at for attempting an electric turbo, then 6 months later BMW introduced the triple turbo (1 electric turbo) diesel.

You can tell a Finn but you can't tell him much > Leon711 03/26/2015 at 15:02

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How fast could the Dyson motor spin the turbo, and was it simply to give the turbo a head start or did that replace the exhaust side?

Leon711 > You can tell a Finn but you can't tell him much 03/26/2015 at 18:56

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the dyson was rated for over 100k rpm but with the additional weight of the impeller it was likely much less. it was intended to replace the exhaust side. All I intended to do at the time was show that an electric turbo could be done. Ideally a custom motor would be best because the dyson ran off 240 volts not 12 or 24v. I reasoned that it could be cheaply put on an existing na engine for use in high altitude or to reduce lag on an existing turbo system if added.