Comments by "H. de Jong" (@h.dejong2531) on "" video.

  1. The LSST/Vera Rubin is basically that. It'll image the entire sky every few days, then we can do comparisons between observations.
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  2. The N1 was run on a shoestring budget. That meant no test installation where the full first stage could be tested. So the plan was to do that kind of testing by launching rockets instead. The first few launches just had dummies for the upper stages, and a bunch of failures was entirely expected: they planned 14 test launches. To make matters worse, the NK-15 was a single-use engine: it used pyrotechnic valves that had to be replaced after use, so instead of testing each engine, they'd build 10, test 5 of them and if those tests were successful, they'd install the other 5. Some of the issues were caused by primitive electronics (one one launch, one engine failed, and the engine control system which was supposed to shut down the engine on the opposite side to retain thrust symmetry, shut down all engines instead). Primitive electronics also meant things like vibration in the propellant lines could not be modelled, but had to be found though trial and error (again, by launching instead of test bench work).
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  3. Ingenuity is a proof of concept that's already outlived its expected lifetime by a lot. They didn't include a provision for Perseverance to recharge Ingenuity because that would have added cost and risk, while not being necessary for Ingenuity's primary mission.
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