Hi! Yes, I know that faster-than-light travel is impossible. But please stay with me for a while to help me understand this. Let's imagine we take some unobtainium and build a 12-km-radius propeller, attached to an engine able to accelerate it up to 250,000 rpm (like a turbocharger, or not a few large industrial motors and turbines.) Then we plug this engine to the nearest sun or whatever and smoothly accelerate the thing.(adsbygoogle = window.adsbygoogle || []).push({});

According to my (classical) calculations, the tips of the propeller would reach a linear velocity ofcslightly under 239,000 rpm, and we'd still have over 11,000 remaining rpm's to (classically) accelerate them abovec. To keep the thing stable, we maybe could add another counter-rotating propeller, as in Kamov-style helicopters.

I know Relativity totally forbids this. But... what would happen as we approach the 239,000 rpm mark to make it impossible, please?

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# B Relativistic tips of a propeller

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