[HN Gopher] How the Hall Effect still reverberates
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How the Hall Effect still reverberates
Author : headalgorithm
Score : 34 points
Date : 2022-01-28 20:20 UTC (3 days ago)
(HTM) web link (spectrum.ieee.org)
(TXT) w3m dump (spectrum.ieee.org)
| fuzzfactor wrote:
| I thought they were going to say something about the Hall Effect
| sensors inside the analog reverb "tanks" of the vintage guitar
| amplifiers.
| ncmncm wrote:
| I was impressed that Tsiolkovsky knew about Hall-effect ion
| propulsion.
| hermitdev wrote:
| Doesn't the problem still remain, though, that you're still
| expelling _something_ from your spacecraft. Sure, it may be more
| efficient that a chemical rocket, but are we not still in the
| conundrum of you have to carry the stuff you 're going to expel
| from your craft to get motive? The article mentions moving a 2600
| kg craft with the force of about the weight of 5 quarters, but
| how much mass of the fuel is expelled to attain that force? How
| long can that 5-quarter burn last before running out of fuel?
|
| Space is pretty empty, but not entirely so, right? Would it be
| possible to somehow gather the stray atoms & dust that's in a
| craft's path to "top off the tank"? I know I'm straying into
| science-fiction area here, but yeah, basically a fuel scoop you
| might see in say, Elite: Dangerous or Star Gate: Universe (but
| probably without the part of basically flying into the atmosphere
| of a star).
| zardo wrote:
| >but how much mass of the fuel is expelled to attain that
| force?
|
| (Force of five quarters at 1g)/(exhaust velocity) = (mass flow
| rate of propellent)
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