On: Apollo 11 vs. USB-C Chargers (2020)

[jcalvinowens]

> Modern fly-by-wire planes are said to have 12-way voting

Do you have a source for that? Everything I've ever read about Airbus says the various flight control systems are doubly redundant (three units). Twelve sounds like it would be far beyond diminishing returns...

[jojobas → jcalvinowens]

That was word of mouth. This website says 5 independent computers, of which 2 use different hardware and software so as not to fail in the same fashion.

https://www.rightattitudes.com/2020/04/06/airbus-flight-cont...

I'd imagine every computer relies on redundant stick/pedal encoders, which is how a 12-way notion appeared.

[fulafel → jojobas]

There's several subsystems that have backup functionality or piloting fallback available incase of subsystem failure, and subsystems have internal 2-weay or 3-way redundancy/voting. See eg https://aviation.stackexchange.com/questions/15234/how-does-...

[jcalvinowens → jojobas]

That blog isn't very authoritative, and doesn't go into any detail at all.

> I'd imagine every computer relies on redundant stick/pedal encoders, which is how a 12-way notion appeared.

That's disingenuous at best. The lug nuts on my car aren't 20x redundant... if you randomly loosen four, catastrophic failure is possible.

[numpad0 → jcalvinowens]

This shallow dismissal sounds "sus". It's just off.