Help me to launch a rocket into orbit

[JakGamingKSP]

Halp i need to know how to launch a rocket into orbit

[Vanamonde]

How about this?

Oh, and thread moved to Gameplay Questions, since it's seeking help rather than offering it. 

[Jaeleth]

There are plenty of movies around explaining this. But, to put it simple, build a rocket where the sum of delta v's from all stages is equal or greater than 3400m/s, ok, make it 3600, for starters. Then launch, at a about 1.5km or 130m/s start your gravity turn (turn very slightly towards east, that is, heading 090 on your navball) (do not overturn and do not gain too much velocity too early), press M, fly from there, make sure the parabola of your trajectory is not too steep neither too shallow, check your Ap, wait till it reaches 75km (safer) set rocket to prograde, shut down engines and hands off keyboard until altitude above 70km. From now on, put your rocket level with the horizon and ignite engines once more. Keep controlling thrust /pitch in a way that Ap is inching ahead of you and not increasing much... Watch for Pe coming at the other side of the planet, when Pe > 70km... you're in orbit.

Edited March 4, 2017 by Jaeleth

[JakGamingKSP]

On 05/03/2017 at 4:46 AM, Jaeleth said:

There are plenty of movies around explaining this. But, to put it simple, build a rocket where the sum of delta v's from all stages is equal or greater than 3400m/s, ok, make it 3600, for starters. Then launch, at a about 1.5km or 130m/s start your gravity turn (turn very slightly towards east, that is, heading 090 on your navball) (do not overturn and do not gain too much velocity too early), press M, fly from there, make sure the parabola of your trajectory is not too steep neither too shallow, check your Ap, wait till it reaches 75km (safer) set rocket to prograde, shut down engines and hands off keyboard until altitude above 70km. From now on, put your rocket level with the horizon and ignite engines once more. Keep controlling thrust /pitch in a way that Ap is inching ahead of you and not increasing much... Watch for Pe coming at the other side of the planet, when Pe > 70km... you're in orbit.

I am young so wat is delta v

[Streetwind]

40 minutes ago, JakGamingKSP said:

I am young so wat is delta v

The basic gist is this:

In space, there is no such thing as standing still. It is physically impossible to not move. This may sound weird for us here on Earth, were standing still is literally the easiest thing to do (you just stop actively trying to move), but that's not how space works. Everything in space always moves.

On Earth, we measure a trip from one point to another in distances, because those points are static. They don't move. But giving a distance in space is pointless. If everything moves, the distance changes constantly.

What you do instead, is asking: how fast is object A moving in relation to object B, and in which relative directions? And from that, you can figure out how you must change the speed and direction of A so that it is the same as that of B. If you manage to make this change at the right point in space, and at the right time, you can create a situation where both A and B are right next to each other, and moving at exactly the same speed in exactly the same direction. And voila: object A has successfully traveled to object B. All without measuring a distance.

"Speed and direction" has another, simpler name: velocity. So when traveling to space, we talk about changes in velocity. Because that doesn't exactly roll off the tongue, people started shortening it. They used the greek word for change, delta. And they shortened velocity to just its first letter.

That is "delta V". It means "change in velocity". It means the amount of change you apply to the movement of your spacecraft to make it move somewhere else in space. The more dV a spacecraft has, the more often and more strongly it can change its velocity, meaning it can go to places with a movement that is very different to that of the origin. Such as a far-away planet, like Moho or Eeloo. Or, it can make easy trips, such as to the Mun, multiple times without running out of fuel.

In practical application, dV is for a spacecraft what "remaining range" would be for a car.

 

(For advanced reading, look up the Rocket Equation. Yes, it's literally called that. That is what you use to calculate how much dV your spacecraft currently has. You can solve it by hand with a calculator, or you can install a mod that calculates this for you and shows you ingame.)

 

Edited March 10, 2017 by Streetwind

[Aegolius13]

Adding to @Streetwind'so excellent explanation: delta-v is particularly useful because it allows you to compare vastly different rockets.   You can't ask how far a rocket can go on 400 units of fuel,  because that depends entirely on how big your ship is,  and other factors. 

However,  a given maneuver always costs the same amount of delta-v, no matter what ship does it.  For example,  it takes about an 850 m/s change in velocity to get from low Kerbin orbit to the Mun via a typical transfer.  

So, if you have a mission in mind,  you can use delta-v to understand what you need to build.  As mentioned above,  the Rocket Equation will tell you how much delta-v a given ship  (or stage of a ship) can manage.   Briefly, the more fuel you have,  the less nonfuel mass you have,  and the more efficient engines you have,  the more delta-v you will end up with.  Those are all pretty obvious ideas,  but the Rocket Equation gives you a hardvnumber you can compare to the delta-v requirements of your mission. 

Delta-v can also help you compare different options for maneuvers/flight plans.   For example,  if you figure out a gravity assist will save 400 m/s vs no gravity assist,  you can plug that figure into any ship. 

I like to think of it like this: the goal of designing a ship is to give it as much delta-v as possible,  within mission and budget constraints.   The goal of flying a ship is to use as little delta-v as possible, through efficient maneuvers. 

 

[JakGamingKSP]

5 hours ago, Streetwind said:

The basic gist is this:

In space, there is no such thing as standing still. It is physically impossible to not move. This may sound weird for us here on Earth, were standing still is literally the easiest thing to do (you just stop actively trying to move), but that's not how space works. Everything in space always moves.

On Earth, we measure a trip from one point to another in distances, because those points are static. They don't move. But giving a distance in space is pointless. If everything moves, the distance changes constantly.

What you do instead, is asking: how fast is object A moving in relation to object B, and in which relative directions? And from that, you can figure out how you must change the speed and direction of A so that it is the same as that of B. If you manage to make this change at the right point in space, and at the right time, you can create a situation where both A and B are right next to each other, and moving at exactly the same speed in exactly the same direction. And voila: object A has successfully traveled to object B. All without measuring a distance.

"Speed and direction" has another, simpler name: velocity. So when traveling to space, we talk about changes in velocity. Because that doesn't exactly roll off the tongue, people started shortening it. They used the greek word for change, delta. And they shortened velocity to just its first letter.

That is "delta V". It means "change in velocity". It means the amount of change you apply to the movement of your spacecraft to make it move somewhere else in space. The more dV a spacecraft has, the more often and more strongly it can change its velocity, meaning it can go to places with a movement that is very different to that of the origin. Such as a far-away planet, like Moho or Eeloo. Or, it can make easy trips, such as to the Mun, multiple times without running out of fuel.

In practical application, dV is for a spacecraft what "remaining range" would be for a car.

 

(For advanced reading, look up the Rocket Equation. Yes, it's literally called that. That is what you use to calculate how much dV your spacecraft currently has. You can solve it by hand with a calculator, or you can install a mod that calculates this for you and shows you ingame.)

 

thanks

[Freshmeat]

/nitpick: Delta is just the Greek letter d. Capital delta is used in science to signify change.