How to set the initial state of the vessel

[GYskyfall]

What should I do if I want to put a spaceship in the designated position and give it the designated initial state such as,speed(including direction and magnitude), or that is just impossible

[sumghai]

The HyperEdit mod will allow you to instantly reposition a spaceship anywhere in the Kerbol system, adjust its resources etc.:

 

[GYskyfall]

2 minutes ago, sumghai said:

The HyperEdit mod will allow you to instantly reposition a spaceship anywhere in the Kerbol system, adjust its resources etc.:

but it can't set the speed at diferent direction at the same time

Edited September 1, 2018 by sumghai
Separated reply from actual quote

[sumghai]

3 minutes ago, GYskyfall said:

but it can't set the speed at diferent direction at the same time

There's definitely a menu option to adjust the velocity (speed and direction) of spacecraft at any location.

Edited September 1, 2018 by sumghai
Fix minor spelling mistake

[GYskyfall]

1 minute ago, sumghai said:

There's definitely a menu option to adjust the velocity (speed and direction) of spacecraft at any location.

but not at the same time, you only can set one by one

 

[sumghai]

4 minutes ago, GYskyfall said:

but not at the same time, you only can set one by one

• Open HyperEdit (Alt-H)
• Select Orbit Editor > Velocity
• Set the Speed value
• Choose the Direction (Prograde, Normal, Radial, North, East, Up - use negative Speed values if you want Retrograde, Antinormal, Antiradial, South, West, Down)
• Click Apply

What exactly are you trying to do with your spacecraft? Setting it on a specific orbit?

[GYskyfall]

28 minutes ago, sumghai said:

• Open HyperEdit (Alt-H)
• Select Orbit Editor > Velocity
• Set the Speed value
• Choose the Direction (Prograde, Normal, Radial, North, East, Up - use negative Speed values if you want Retrograde, Antinormal, Antiradial, South, West, Down)
• Click Apply

What exactly are you trying to do with your spacecraft? Setting it on a specific orbit?

for example ,in a coordinate Coordinate System ,vector speed V is composed of Vx,Vy,Vz. If you want set a vector V, you should set Vx,Vy,Vz at the sme time.

Hyperedit just set one direction during an "apply"

[sumghai]

38 minutes ago, GYskyfall said:

for example ,in a coordinate Coordinate System ,vector speed V is composed of Vx,Vy,Vz. If you want set a vector V, you should set Vx,Vy,Vz at the sme time.

Hyperedit just set one direction during an "apply"

That's because the stock game itself doesn't support arbitrary velocity vectors. Even if you could specify them, orbital mechanics immediately override them anyway.

[Sharpy]

You can do this indirectly, through the orbit editor. Your Cartesian state vector corresponds to a certain set of Keplerian elements. Setting these elements all at once is possible through Hyperedit.

[Tyko]

Couldn't you even do it in the F12 menu? Define the orbit and parameters like velocity & direction of travel will be determined by your orbit and the body you're orbiting...

(actually this might be what @Sharpy said above, more precisely, when he mentioned Keplerian elements) 

Edited September 5, 2018 by Tyko

[Vanamonde]

Is this for the Making History expansion or something you're trying to do in the base game?