--- In spacesettlers@yahoogroups.com #12972, Lucio de Souza Coelho wrote:
> Of course vertical cities are physically possible on Earth. However, it is far easier to build a vertical city on the Moon. Way less need for compressile strenght, much higher scale height allowing buildings 18 kilometers high with no repressurization through different levels, way less energy to transport something from one height to another
Maybe magnetic moonboots would hold passengers in place on the floor as the elevator car is accelerated (using vacuum v- air pressure?) to desired speed and decelerated in the same manner. Seems like that would make your calculations meaningless. Just because gravity is X it doesnt mean that Humans necessarilly have to allow it to act upon them in an unaltered manner. Just as on Earth, man is adept at manipulating his environment in order to further his desires, so too would it be on the Moon, Mars or Jupiter.
Sent: Saturday, April 27, 2013 2:01 AM
To: spacesettlers@yahoogroups.com
Subject: [spacesettlers] Lunar building elevators (was Re: Vertical cities are not impossible on Earth)
--- In mailto:spacesettlers%40yahoogroups.com #12972, Lucio de Souza Coelho wrote:
> Of course vertical cities are physically possible on Earth. However, it is far easier to build a vertical city on the Moon. Way less need for compressile strenght, much higher scale height allowing buildings 18 kilometers high with no repressurization through different levels, way less energy to transport something from one height to another
Speaking of elevators, how do you imagine would an elevator in such a building work? Would it fall at half a Moon-g until it reached the half-way point, at which point it would decelerate at the same rate giving the passengers the perception of 2 Moon-g's? If so, it would take about 3.6 seconds to complete a 4-meter vertical trip vs. only about 1.8 seconds for a similar 4-meter vertical trip on Earth.
Do elevators typically accelerate and decelerate at 5 metres per second per second on Earth? I have to admit that I don't know.
--- In spacesettlers@yahoogroups.com, "sailor.barsoom" wrote:
> Do elevators typically accelerate and decelerate at 5 metres per second per second on Earth?
http://www.youtube.com/watch?v=HgnpU0jq14s
That works out to an average rate of acceleration of about 1.2 m/s/s.
(The tour-guide in the elevator says: "Ladies and gentlemen, you may swallow to equalize the pressure".)
--- In spacesettlers@yahoogroups.com, "hitssquad" wrote:
>
> --- In spacesettlers@yahoogroups.com #12972, Lucio de Souza Coelho wrote:
> > Of course vertical cities are physically possible on Earth. However, it is far easier to build a vertical city on the Moon. Way less need for compressile strenght, much higher scale height allowing buildings 18 kilometers high with no repressurization through different levels, way less energy to transport something from one height to another
>
> Speaking of elevators, how do you imagine would an elevator in such a building work? Would it fall at half a Moon-g until it reached the half-way point, at which point it would decelerate at the same rate giving the passengers the perception of 2 Moon-g's? If so, it would take about 3.6 seconds to complete a 4-meter vertical trip vs. only about 1.8 seconds for a similar 4-meter vertical trip on Earth.
Brooks
--- In spacesettlers@yahoogroups.com, "brooksn" wrote:
> I would imagine going down would take longer if you don't want passengers going into free fall or close to it on the downward descent.
> I would think they could handle more then 2 moon-g's during braking though.
Maybe not, if the Kazakhstan procedure is anything to go by:
http://www.youtube.com/watch?v=5bE3jAxqXYE
--- In spacesettlers, "hitssquad" wrote:
>> Do elevators typically accelerate and decelerate at 5
>> metres per second per second on Earth?
> This video shows the $2 million elevator in the Taipei 101
> building taking about 8.5 second to accelerate to 10 m/s:
> http://www.youtube.com/watch?v=HgnpU0jq14s
>
> That works out to an average rate of acceleration of about 1.2 m/s/s.
Thank you. It turns out that lunar gravity is just over 1.6 m/s/s, so the same 1.2 m/s/s downward acceleration could be used on the Moon, but the passengers would have to be prepared to be durn near weightless for a little while. They could also use, on the downward trip, decelerations of about 6 m/s/s with no real problem.
On upward trips, they could use the 6 m/s/s accelerations, but would have to decelerate at less than 1.6 m/s/s, and maybe 1 m/s/s should be the limit, for safety.