Adam Savage Builds a Hero’s Engine Sweet Cream Pourer!
Adam decided to make an aeolipile — or Hero’s engine — powered by liquid nitrogen as part of a video for Starbucks. The idea was that the engine would drive a pulley system that would pour sweet cream into Adam’s glass of Nitro Cold Brew. His build, however, was not without complication. Here’s how it turned out. (This video is sponsored by Starbucks. Order Nitro Cold Brew here)
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Please go to my friend’s new coffee place in Syosett and blow his mind.
Adam went full mad scientist.
It isn’t that I object to sponsored videos in any general sense–we are bombarded by ads all the time and have gotten good at tuning them out. But you’ll lose me as a fan if the promotional content begins to outweigh the informational and entertainment value. The hearing aid and now coffee drink advertorials are still in my interest-capture zone but much more promotional density will be a turnoff. I do greatly appreciate the sponsorship declaration in the video description, though I still look for clues as to what content is sponsor-driven–in that sense the Starbucks video seems more up-front than the hearing aid video, which feels like it was a perhaps-insincere PSA. A simple declaration like “I’ve teamed up with Wydex to tell you about something that’s near and dear to me…,” would have won me over with fewer misgivings.
Ah, this is why a water/compressed air rocket uses air to push out the dense water. Escaping gas, by itself, transfers too little momentum. When Adam spun the sphere up to high speeds, centrifugal force flung some of the liquid nitrogen outward and up to the nozzles. Acting like a water rocket. As it spun faster, more LN2 impinged on the nozzles- with enough reaction force to operate the machine.
Steam by itself will rotate a sphere without a load, but is underpowered. Greek steam engine technology remained mostly a toy and theater/Temple prop, rather than a prime mover for industry or war.
That was definitely EXTRA cream
I think what’s actually happening is the spinning is pushing the liquid up the sides, increasing the amount of heat it’s absorbing, until there’s enough momentum to maintain the spin. You could acheive the same thing by torching a point on the bottom (just like a steam-powered Hero’s Engine).
At around 5:45 you can hear liquid nitrogen escaping from the nozzles in pulses. Why? The LN2 blocks the evaporating gas, the gas pushes out a slug of LN2, the pressure drops, LN2 reblocks the exit, and the cycle repeats.
RUBE GOLDBERG would be proud!!!
Madness
love it
I love the rig, but interesting-wise I like the actual nitrogen in the coffee as an idea way more. This has nothing to do with nitrogen or the concept per-se. Fun though. Recent Veratasium video was better in that sense, getting nitrogen out of the air, where the whole process revolves 😉 around nitrogen.