Interesting & Funny Videos

siegecrossbow said:

Is that her hand writing? And I thought mine looked bad… for all its faults at least it doesn’t look like something scribbled by a six year old…

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ZeEa5KPul said:

There's another aspect I haven't seen discussed in this thread: navigation. One of the weaknesses of SSNs is that they occasionally need to surface to get some outside position fix like GPS (or a sextant through the periscope) to calibrate their dead reckoning systems - mechanical and laser gyroscopes and so forth.

One very interesting new solution to this navigation problem is a quantum method called cold atom interferometry. As I understand it, the whole setup (the lasers, the vacuum chamber for the rubidium atoms, and other components) used to occupy an entire room a decade ago but can now be shrunk down to about the size of a fridge. A classical dead reckoning navigation system can be off by as much as a kilometer over 24 hours through accumulated errors. This could operate for months without drifting by more than a few meters.

What it needs is a very reliable and steady power source, which is an overlooked advantage of a turboelectric over a purely mechanical submarine.

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ZeEa5KPul said:

A video about the cold atom interferometry I was talking about here.

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