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Comment Re:CFC-free foam caused it (Score 1) 93

It was said at the time that the white paint on the early shuttle tanks served to also keep the foam together and reduce drag on it.

They scrapped it to save money and increase payload by a tiny fraction. But mostly to save money.

Engineers: this is necessary.
NASA Bean Counters: nah.

Every freakin' time.

Comment Re:Safety and regulatory standards (Score 1) 283

And yet the SmartCar (the original one, not the SmartForTwo) was certified in the EU and uncertifiable in the US. We can argue all day as to whose safety and registration regulations are stronger or in some sense better (neither of which was part of my OP), but the fact is they are different. And the PRC EV manufactures have so far not see a positive return in meeting the US/Canada standards and entering the market.

Comment Re:Spoiler alert (Score 1) 88

Interesting.

I'm building a solar battery from LTO cells and am now wondering about adding a simple square driver.

Gotta see if they're NMC or not. 20,000 cycle rating natively might go to 40,000?

Quote:
```
The length of relaxation period was
the same as current pulse, resulting in a Duty Ratio of 50% under PC charg-
ing. The average current for all three charging modes were kept the same
(1C, i.e., 2.2 A), thus the current during PC charging (2C, i.e., 4.4 A) was
twice as large as that during CC charging.
```

Comment Re:Do people realize this is nuclear energy? (Score 1) 41

> Only the Soviets were so uncaring for public safety to build a nuclear power plant like that,

Years ago a commenter here claimed to have been involved with Chernobyl and the way it went down is that a grad student in nuclear engineering wanted to run his pet theory experiment on the Chernobyl reactor.

Everybody said no up and down the chain.

Bu his father was high up in the Politburo and ordered it.

Soviets do what they're told.

It sounds plausible enough that a smart researcher could probably find the father and son from records.

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