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Author Topic: Musk launches ARK B  (Read 1646 times)

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Online Yet_Another

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Re: Musk launches ARK B
« Reply #30 on: February 07, 2018, 07:03:04 pm »
But it will also make some already hot areas uninhabitable, in addition to flooding caused by rising sea levels - and a large proportion of major cities are on or close to coasts.
Win - win, then. No need to go to really hot places, and a reduction in cities.
Tony

'...things are not done by those who sit down to count the cost of every thought and act.' - Sir Daniel Gooch of IKB

Offline Skyline2uk

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Re: Musk launches ARK B
« Reply #31 on: February 07, 2018, 07:13:45 pm »
Leaving aside the philosophical and ethical issues, as an Aeronautical Engineer this thing boggles my mind.

The fact that it can lift over 63 metric tonnes into orbit (compared to the Shuttle’s 22.8 tonnes) is amazing enough....but the whole “lets land bits of it standing up right back where we left it is nothing short of whichcraft.

I cannot exaggerate how difficult this is, real Thunderbirds (or “You only live twice”) stuff.

In fact if Musk announces he is off to his newly purchased private island, complete with large exstict volcano, we need to take notice. Because believe me, he has now done the hardest part of Blofeld’s plan.....

Skyline2uk

Offline MalcolmAL

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Re: Musk launches ARK B
« Reply #32 on: February 07, 2018, 07:30:53 pm »
Leaving aside the philosophical and ethical issues, as an Aeronautical Engineer this thing boggles my mind.

believe me, he has now done the hardest part of Blofeld’s plan.....
Yes ! having played a small part in the Giotto to Halley mission, and the Ulysses solar polar mission I am well & truly boggled.

This is the best thing/hope since  Apollo was abandoned.

Offline daffy

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Re: Musk launches ARK B
« Reply #33 on: February 07, 2018, 07:33:47 pm »
Agreed, and I'm no engineer. The World needs people like Musk. People who push the boundaries, and take the risks. This latest step in technological advance is stupendous and should be widely applauded.


Mike

Sufferin' succotash!

Offline MalcolmAL

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Re: Musk launches ARK B
« Reply #34 on: February 07, 2018, 07:37:44 pm »
and a large proportion of major cities are on or close to coasts.
Win - win, then. No need to go to really hot places, and a reduction in cities.
:thumbsup:
or even win-win-win, we badly need a new tropical swamp carboniferous period to lay down some more oil reserves for future generations
(dons flame proof undergarments )
and I did mention 'shame about coastal cities' without being size-ist !  :angel:

Offline joe cassidy

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Re: Musk launches ARK B
« Reply #35 on: February 07, 2018, 07:40:19 pm »
British wine will become the best in Europe !

Offline MalcolmAL

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Re: Musk launches ARK B
« Reply #36 on: February 07, 2018, 07:52:05 pm »
British wine will become the best in Europe !
:laughabovepost:
(A) What do you mean "will become" ? ! It already is.
Or
(B) by the time that happens it will be English Wine, cos all the various bits of Britain will have broke up !

ducks.

Offline Bealman

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Re: Musk launches ARK B
« Reply #37 on: February 07, 2018, 08:56:05 pm »
All I think is this: two of the greatest Apollo heroes (they were all heroes) passed away in the last twelve months - Gene Cernan and John Young, and this sort of makes up for it.

It's time to go out there again!
Vision over visibility. Bono, U2.

Online Railwaygun

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Re: Musk launches ARK B
« Reply #38 on: February 07, 2018, 10:15:17 pm »
The Tesla seems to Be en en route to the asteroid belt!

Also Musk is developing a BFG!! Oops a BFR - Big Falcon Rocket!!

Mind you Bleep & Booster  got there first!!
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Offline MalcolmAL

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Re: Musk launches ARK B
« Reply #39 on: February 07, 2018, 10:19:19 pm »
Oops a BFR - Big Falcon Rocket!!
are you sure about that middle word, I thought it had ing in it ?

 :angel:

Offline MalcolmAL

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Re: Musk launches ARK B
« Reply #40 on: February 07, 2018, 10:35:45 pm »
en route to the asteroid belt!
Ok I'll try to be serious ( for a mo.) with some mention of orbital dynamics :

It made a final apogee boost with deltaV a little larger than he told anyone beforehand, the result is that it now has a perihelion of where it was near here (previously its perigee) out to an aphelion near the asteroid belt between Mars and Jupiter.

The result is that it will, for the next umteen years, could be millions of years, *orbit the sun between perihelion near the Earth's orbit and its aphelion out there near the asteroids.
Its perihelion being near to where we - and our vital communications satellites, the ISS and various others will be passing by from time to time, -  the ISS can dodge but others can not.
In short it is more space junk !

*Unless it is perturbed by a close encounter with an asteroid, then no one knows where it will go next.

« Last Edit: February 07, 2018, 10:39:18 pm by MalcolmAL »

Online Yet_Another

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Re: Musk launches ARK B
« Reply #41 on: February 07, 2018, 11:39:18 pm »
Do we know what the orbital period is yet?

I guess it could be used for target practice when testing anti-asteroid missiles...
Tony

'...things are not done by those who sit down to count the cost of every thought and act.' - Sir Daniel Gooch of IKB

Online Railwaygun

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Re: Musk launches ARK B
« Reply #42 on: February 08, 2018, 12:32:02 am »
 :-[
Oops a BFR - Big Falcon Rocket!!
are you sure about that middle word, I thought it had ing in it ?

 :angel:

 :-[

thats what Musk called it!
This has been a public service announcement
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Offline MalcolmAL

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Re: Musk launches ARK B
« Reply #43 on: February 08, 2018, 02:07:49 am »
Do we know what the orbital period is yet?
I dont know, cant find anything ! so,
I'll have a bash if no one else ? :) ( caveat it is 2am so anything might go wrong and I'll look very foolish when we all wake up! )

for a small body orbiting a massive one the period is given by

T=2.pi.sqrt((a^3)/u)

where
a = semi major axis = perihelion+aphelion divided by 2

u = standard gravitational parameter (for the Sun) = GM(sun) = 1.33x 10^20 m^3/s^2

the perihelion  (is just a bit less than the Earth orbit radius) =0.98AU
and aphelion approx orbit of Ceres = 2.61AU
converting AU to m we get
a=sma= 2.68x10^11m

and 2.pi= 6.88

sqrt( 2.68^3 x 10^33)/ (1.33x 10^20)
= sqrt(19.2 x 10^33)/(1.33x 10^20)
=sqrt((1.92/1.33) x 10^14)
=sqrt(1.44)x 10^7
=1.22x10^7

T=6.88x 1.22 x 10^7 seconds

T=8.39/31.5 x 10 year
T=2.66year

Hmmm, wot think ? spot any bloomers  ??
considering the period of Ceres is 4.5y it looks to be in the right ball park !
« Last Edit: February 08, 2018, 02:31:05 am by MalcolmAL »

Offline daffy

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Re: Musk launches ARK B
« Reply #44 on: February 08, 2018, 04:52:17 am »
I'll bow to your mathematics, physics, and insomnia Malcolm. :admiration:

So, by my rough estimation based on your figure, when this car returns to trouble Earth's many satellites in late September 2020, should we refer to it as the Tesla Roguester? :hmmm:
Mike

Sufferin' succotash!

 

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