Any junk yard has flywheels galore... if you must persist in this... why reinvent the flywheel. Most small motors have flywheels. Lots of part motors to be found.So based on what a few people have commented on, I've produced another variation of the experiment using a flywheel. I'm buying a block of aluminum and we'll make the 718g flywheel at my friend's machine shop in the next 7-10 days when I'm back in his area. I can't find anyone online selling small flywheels, not even the guys on youtube who have the "links" to their parts lists, which is only ever half the parts they use anyhow. I'll 3D print all the motor brackets and see if my friend has enough extra metal to where we can CNC out the support brackets for the flywheel. I'm ordering up the aluminum T-Slot base as well, rather than printing it.
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What's the power loss on that system at the end of the day? Makes sense from a financial standpoint considering the fluctuations in the cost to purchase energy; just wondering if compressed air truly is the best form of a battery to store said energy? Or is it simply the cheapest to scale up?