News for hackers. Stuff that matters.

A comment on Japan starts space elevator experiments. Parent comment

Re:Japan starts space elevator experiments by a1369209993 on Sunday September 02, 2018 @04:43PM (#17898543)
You'd need to accelerate at 68 G's[0] (foreward for the first four minutes, backward for the last four). Not neccesarily unsurvivable, but your passengers (and most cargo) are likely to be unpleasantly pastelike.

We should probably treat it more like commercial air travel than compressive-structure elevator rides.

0: 200kph*8day/8min/2min => 67.981081 gravity

[ Parent | on HN ]
Re:Japan starts space elevator experiments by perl4ever on Sunday September 02, 2018 @05:11PM (#17898662)
TIL forwards acceleration is called "eyeballs in" and backwards is called "eyeballs out".

It looks like 6 Gs is about as much as is feasible for an extended period of time.

[ Parent | on HN ]
Re:Japan starts space elevator experiments by ridgeguy on Sunday September 02, 2018 @09:55PM (#17899740)
Brief search didn't get me anything about longest ride on a centrifuge, which I guess would be the only way to test G-tolerance over extended periods. Where 'extended periods' means > an hour.

Any pointers to 6 Gs as being tolerable, for how long? Tnx.

[ Parent | on HN ]
Re:Japan starts space elevator experiments by perl4ever on Sunday September 02, 2018 @11:11PM (#17900053)
Don't know, I was quoting a figure for 10 minutes. 6 gs for 10 minutes will get you to 35 km/s, which I believe exceeds any rocket launches so far.
[ Parent | on HN ]
Re:Japan starts space elevator experiments by jjeaff on Sunday September 02, 2018 @09:57PM (#17899756)
I don't think 68 Gs is survivable at all. At least not for more than a fraction of a second. 46 Gs for a few seconds is the most a human has survived that we know of.

10 Gs for 1 minute is lethal.

[ Parent | on HN ]
Re:Japan starts space elevator experiments by a1369209993 on Sunday September 02, 2018 @11:39PM (#17900145)
> unpleasantly pastelike.

I don't think you'd get actual paste, but yes, 8-minute space elevator rides aren't looking very physically possible.

[ Parent | on HN ]