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Edited by hoangtrunglien
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24 minutes ago, Lo Var Lachland said:

Man, I wish I could do this. Moving a moon into closer orbit around Kerbin would provide great mining possibilities. 

Retrograde thrust would lower the orbit, unless you are talking about something like the Mun which is far too large. I have successfully moved an A-class asteroid into a low Kerbin orbit.

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@Lo Var Lachland @ansaman We are not talking changing planetary or munar orbits, they are on rails and cannot be changed. But if you want to orbit around a planet really fast, you can in principle thrust inwards while keeping a high prograde speed. From any High School textbook, the force needed for a circular motion is:

F_circle = m*v^2/r

Where F is the radial inward force needed to keep the circular orbit, m is the mass of the vessel, v is prograde velocity and r is the distance to the center of the circle. From the law of gravity, you get an inward force of:

F_inward = G*m*M/r^2

M being the mass of the body you orbit, and G being the universal gravity constant. Solving for v, you get

v = sqrt(G*M/r)

Which is the velocity you have when you orbit a body in free fall. However, if you want a higher velocity, you can obtain it by adding an additional inward force F (not outward, @magnemoe was below required speed for orbit):

F_inward = G*m*M/r*^2 + F

How much you need for given r and v is a simple matter of combining above equations

F = m/r * (v^2 - G*M/r)

 

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6 hours ago, hoangtrunglien said:

Would it be possible to use engines pointing downwards and constantly thrusting to orbit a planet faster than escape velocity?

i ask, because science.

It seems people are reading this question two different ways. I think the OP meant the 2nd one:

Q1. Is it possible to attach an engine pointing down (towards center of mass) of a planet in order to change its orbit? 

A1:  Not realistically for anything other than an asteroid 1.

 

Q2: Is it possible for a spacecraft in orbit to be burning an engine downward (toward center of mass) in order to maintain orbit of a planet but while traveling at escape velocity?

A2: Yes, but. Gravity applies a constant force effectively pulling a small mass towards a larger one. This is similar to having an engine applying a constant force pointing towards a central point. You could essentially orbit a point in deep space like this. The difficulty is that burning an engine requires you to expend propellant, which would change your mass and require constant adjustment of thrust levels (hard to do in KSP).

A2.1: Why though?

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10 hours ago, hoangtrunglien said:

Would it be possible to use engines pointing downwards and constantly thrusting to orbit a planet faster than escape velocity?

Yes, as long as your fuel holds out.

To the other folks posting here:  The OP's not talking about trying to move a planet, guys.  He's talking about trying to orbit faster than normal orbital velocity, by thrusting radially inward to keep his trajectory circling the planet rather than flying off into the beyond.

Also, moving to Gameplay Questions.

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Yes (aside from the confusion about which direction you point the engines), and it's been done, but to do so in KSP for any length of time is difficult, and becomes more so the stronger you want to make the forcing. The inability to time warp while doing so is a major stumbling block even if you solve the other issues with regards to fuel use and so on.

Edited by foamyesque
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20 hours ago, hoangtrunglien said:

Would it be possible to use engines pointing downwards... to orbit a planet faster?

 

18 hours ago, magnemoe said:

You have to burn outward to keep orbit. 

 

Got it! Need to burn downward to go faster while burning outward to stay in orbit. I thought was exactly the oposite :sticktongue:

 

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On 25/06/2017 at 11:42 AM, Lo Var Lachland said:

Man, I wish I could do this. Moving a moon into closer orbit around Kerbin would provide great mining possibilities. 

I think that is what the mod  Kopernicus is for.

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