For Questions That Don't Merit Their Own Thread

[magnemoe]

On 12.6.2017 at 10:14 AM, Green Baron said:

Hm.... one could use pure air from a single tank. or nitrogen if the "inhabitants" had an independent oxygen supply ...

 

As I understand its simpler to scrub co2 and add oxygen in an pure oxygen atmosphere. 
Re-breathers for diving dates back before ww2 but used pure oxygen, re-breathers for air is much more complex, and is recent for diving. Now add that then diving you don't want pure oxygen as its limit you to less than 10 meters. While in space it reduced the over pressure in the capsule and make spacewalks much easier. 



 

[kerbiloid]

Partial pressure of oxygen plays role. So, they kept more or less the same partial pressure of oxygen, decreasing the total pressure and mechanical stress.

On 06.06.2017 at 11:27 PM, cubinator said:

When Apophis flies past Earth in 2029, it will be closer than the geostationary belt. What are the odds of it knocking out some satellites as it passes by?

Apophis diameter is 300 m. To let it knock down more than one satellite, those satellites should fly in 300 m from each other.

Edited June 14, 2017 by kerbiloid

[Steel]

On 2017-6-6 at 9:27 PM, cubinator said:

When Apophis flies past Earth in 2029, it will be closer than the geostationary belt. What are the odds of it knocking out some satellites as it passes by?

As other have said above, essentially zero.

5 hours ago, kerbiloid said:

Apophis diameter is 300 m. To let it knock down more than one satellite, those satellites should fly in 300 m from each other.

There are roughly 400 geosynchronous satellites in orbit [1]. If they are spread (roughly) evenly around that orbit, there's approximately 650 km between each one.

Edited June 14, 2017 by Steel

[p1t1o]

16 hours ago, Steel said:

There are roughly 400 geosynchronous satellites in orbit [1]. If they are spread (roughly) evenly around that orbit, there's approximately 650 km between each one.

And that is if they are all in equatorial orbits, which is not always the case.

[wumpus]

On 6/12/2017 at 6:04 AM, peadar1987 said:

I think it also had to do with the risk of the Bends in the event of depressurisation.

The procedure for astronauts before a flight was to breath pure oxygen for several hours before a flight.  This is why you saw them carry boxes on their way up to the rocket.  Micheal Collins mentions (in "Carrying the Fire", an excellent description of the Apollo program and Apollo 11 in particular) that he thought he had a slight case of the bends during his Gemini flight.  It was significantly less during Apollo, presumably he started de-nitrogenating earlier.

If you needed an atmosphere or so of pressure in the command module at launch (presumably helium would have worked as well, the astronauts were breathing pure oxygen) it didn't turn out to be that big a deal (although venting it out must have cost a bit in the oxygen supply).

[munlander1]

What are infrared photons? 

[K^2]

9 minutes ago, munlander1 said:

What are infrared photons? 

Photons with wavelength longer than that of visible light, but shorter than radio waves. Photons being quanta of electromagnetic radiation, such as infrared light.

[WinkAllKerb'']

just a socio-psycho question/not, i was wandering how local climate and disaster frequency impact various civ. (more or less (( " " )) )locally //edu belief method and tek average level // melting and melting not ; over let's say 50 000 , 10 000, 5 000 sun revolution periods

i m curious on what some think about this, and if it may be of any interest to think about it

 

Edited June 16, 2017 by WinkAllKerb''

[Skylon]

Could an Ariane 60, or Ariane 62/64 without SRBs fly?

[Steel]

1 hour ago, Skylon said:

Could an Ariane 60, or Ariane 62/64 without SRBs fly?

Not a chance. Even without the boosters an Ariane 6 would likely have a fully loaded mass somewhere around 300,000/400,000 kg, or 3,000,000/4,000,000 N. The main engine can produce around 1,350,000 N of thrust, so you get a thrust-to-weight ratio below 0.5.

[Dafni]

How do you get rid of KSPedia? What exact files and folders does one need to delete? Thanks

[0111narwhalz]

1 hour ago, Dafni said:

How do you get rid of KSPedia? What exact files and folders does one need to delete? Thanks

Everything in GameData/Squad/KSPedia. In fact, just nuke the directory as well.

You'll still have the button, and other mods' KSPedia entries will have to be eliminated individually, but that'll get rid of the stock entries.

[WinkAllKerb'']

On 22/06/2017 at 10:31 PM, Skylon said:

Could an Ariane 60, or Ariane 62/64 without SRBs fly?

vv07 anyone ... oh well ... for what i m con cern head with this ...

 

[Grand Ship Builder]

On 6/23/2017 at 4:31 AM, Skylon said:

Could an Ariane 60, or Ariane 62/64 without SRBs fly?

Sure, in fact anything can fly. But probably not very well, especially with a heavy payload.

[magnemoe]

On 16.6.2017 at 10:31 AM, WinkAllKerb'' said:

just a socio-psycho question/not, i was wandering how local climate and disaster frequency impact various civ. (more or less (( " " )) )locally //edu belief method and tek average level // melting and melting not ; over let's say 50 000 , 10 000, 5 000 sun revolution periods

i m curious on what some think about this, and if it may be of any interest to think about it
 

Civilization is not that many thousand year old so we have an lack of experience. 
However it looks like climate change don't have an so huge impact unless the area became an wasteland.
You have the Easter island, it was one culture in south east North America there the area became desert. 
Think they just carried on with the lower capacity who work unless the capacity become too low. 
War was the primary civilization killer, mostly as it replace the aristocracy who created it and replaced it with another civilization. 
You also has social changes, the old Egyptian one hang on until Christianity. 

[Green Baron]

On 16/06/2017 at 9:31 AM, WinkAllKerb'' said:

just a socio-psycho question/not, i was wandering how local climate and disaster frequency impact various civ. (more or less (( " " )) )locally //edu belief method and tek average level // melting and melting not ; over let's say 50 000 , 10 000, 5 000 sun revolution periods

i m curious on what some think about this, and if it may be of any interest to think about it

 

The sun revolves fast, i assume you mean earth years ?

50.000 is a long time. It covers several oxygen isotope stages (quaternial quaternary climatic scale) and more than a single human race living on earth. 40.000 of these years are hunter gatherer times. Yet it is quite well understood but i can only help out with hints, otherwise i'd have to write a paper ;-).

50.000 before now hunters of the cold steppe followed the herds that underwent seasonal wanderings, of course climate dependent.

A highly stressed environment in late ois 3 led to the extinction of several top predators like cave bear and lion, sabretooth cat,... and the decline of the huge animal herds of the cold steppe in asia and europe. America plays no role then. In ois 2, the last cold phase, only a few small groups lived between the scandinavian iceshield and the alp's glaciers that flowed out until the danube. After that, the reforestation didn't allow for the buildup of large groups like there were in the iceage. Mesolithic groups in the forests were small and highly mobile.

One thing that could be of interest to you is the eruption of Laacher See volcano, a continent wide desaster, which is exactly dated and the impact on late ice age groups well studied and understood. Local groups simply vanished because the environment couldn't support them. It took several hundred years until population regained it's numbers (you should check this if interested, not sure if it is still valid;-) Edit: yes, it is).

10.000 before is more or the less a fundamental break in human subsistence as it in that time falls the "invention" of homes, storage, animal breeding and finally growing of sorts of stuff. Human numbers increased quickly, leading to population pressure and intraspecies violence (aka war). But that also means that punctual desasters had a greater effect than before, killing more, and even if not directly so, took the base of subsistence away and thus leading to intraspecies .... you get it :-)

5.000 before now is the end of the neolithic, beginning of copper / bronze crafting and thus better methods to kill each other. The wheel comes up and horses bring humans, especially those with a certain thrive, faster from A to B. Also, it is called "history" in some parts of the world as we have written or depicted information.

To sum up: local climate has always and in any case been one of if not the main force for changes in human subsistence.I leave it to you to judge if for the good or bad. Punctual catastrophic events led to extinction and/or flight of the affected groups as long as there was space to flee to. As the space narrowed and people became more dependent of stability (rainfall, erosion, ground type, ...) these events killed many more than ever before or led to wars over the ressources.

 

Two late examples for the immediate death toll of catastrophies and the rising impact due to growing densities: Cracatoa eruption killed approx. 40.000 in 1883, 2004 indian ocean tsunami/earthquake 280.000 plus unknown missing. Future desasters like storms and flooding can easily kill millions in a wink of an eye, draughts many more over the decades because the poor affected people e.g. in central and east Africa will have little chance to get away or demand territory from the neighbours ...

 

Edited June 24, 2017 by Green Baron

[WinkAllKerb'']

well no idea <= seem an almost legit answer ^^ xDr (also ,out of like for today btw)

Edited June 24, 2017 by WinkAllKerb''

[Green Baron]

Well, ask if not content with the answer ... "almost legit" could be interpreted as "not what i expected".

... as some here have probably noticed i am not after the likes. Spare them for the ones in need :-)

 

[WinkAllKerb'']

well ((an=some anhow)) ^^ apply for the tree ^^ or three ^^ but 3 remain ur green so it's oki ^^

[Nightside]

1 hour ago, prim said:

hey guys. love this game, really challenging and educational, but let me ask you a question. i know there is a lot of math and physics involved here but for the sake of argument, say delta-v ... do i really need to know all this and be able to calculate it and know the value for specific stages of my rocket in order to be successful to say, go to Mun or Duna or wherever or does this fall more under the "advanced" category which obviously real rocket scientists need to know, but for this game ... mandatory or not?

 

heh i feel like i'm back in school, i don't mind learning, i love this stuff, but it's really complicated and it won't be quick. thanks.

Understanding some of the more scientific concepts of space travel such as delta v and aerodynamics are not necessary. KSP allows you to find your own designs by trial and error. Try enough, and you will come up with something that works. 

You may notice that real space programs do a lot more planning and research before launching something since they are limited by money. As a player, I personally am limited in the amount of time I have to play the game so I want my missions to have a good chance of success, and so planning is critical, also I play on a laptop, so I can't build super high part count ships anyway.  With the help of a few ingame tools planning the delta V budget has made the game much more fun and rewarding for me. 

1. Delta V Map (for the Stock system) - Any trip beyond low orbit will be  some combination of escape burns, capture burns and reentries. The delta v required to escape or capture depends on the gravity (mass) of a planet and its radius. You can calculate these things yourself, or just look at a delta v map. If you know where you want to go before you build a rocket, then you need to make sure you build it with enough delta v to actually get you there.

2. Basic Delta V or Mechjeb - Either of these mods show you your delta V per stage while building your rocket. Using these tools you can build each stage efficiently. The advantage of this is that your rockets will look more or less like real rockets, so you can look at real designs for inspiration. 

3. Have fun - If building new rockets to see if they work or not is more fun than fussing over some numbers then do that instead!

 

[KerbMav]

My question would be: Huh?!

 

It is basically the same as normal multiplication from right to left, but it is still cool.

[K^2]

The only advantage of this method is the fact that it keeps track of the cross-terms for you and, if you consider it an advantage, the fact that you don't need to remember multiplication table.

Once you go to numbers with larger digits, however, the counting and larger carries make it completely impractical. That's why we have column multiplication in the first place.

[sevenperforce]

On 6/29/2017 at 2:29 PM, KerbMav said:

My question would be: Huh?!

 

It is basically the same as normal multiplication from right to left, but it is still cool.

Reminds me of this.

[Racescort666]

I don't know if this should be broken into its own thread but would you need a space suit on Titan? Aren't space suits more to provide pressure for our body (and protection from radiation and stuff) but would it be necessary on Titan since it has a dense atmosphere? Obviously you'd need some sort of protective equipment since it's -180 C and there's no oxygen to breathe but you presumably wouldn't need a full blown EVA suit.

[Skylon]

4 minutes ago, Racescort666 said:

I don't know if this should be broken into its own thread but would you need a space suit on Titan? Aren't space suits more to provide pressure for our body (and protection from radiation and stuff) but would it be necessary on Titan since it has a dense atmosphere? Obviously you'd need some sort of protective equipment since it's -180 C and there's no oxygen to breathe but you presumably wouldn't need a full blown EVA suit.

Well at the surface the pressure is 1.45 times that on Earth, equivalent to being around 5m underwater (i think) 

I imagine the suits could be lighter and less strong, but still required.