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Continue to ChatThe propeller propulsing air at subsonic speed in the tunnel https://jgp.ai/2019/04/30/my-trip-to-the-moon-and-mars-part-2/the-propeller-propulsing-air-at-subsonic-speed-in-the-tunnel/
The propeller propulsing air at subsonic speed in the tunnel https://jgp.ai/2019/04/30/my-trip-to-the-moon-and-mars-part-2/the-propeller-propulsing-air-at-subsonic-speed-in-the-tunnel/