TransX How can I launch the spaceship in a precise orbital？

[NOMAD]

Now I am learning TransX.I always try to launch the spacecraft in a precise orbital , but it is difficult. Because it is difficult to rotate the spacecraft in a accurate attitude Sometimes the error is very large .Though I do it carefully,the problem still can't solve.How can I do? Is there anything like "auto burn" that can help us to lanuch the spacecraft in a precise orbital?

 

[the.punk]

I don't know exactly what you mean with "precise orbital". Do you mean how to go to orbit in the right plane for lets say mars?

 

[Ark]

I think he's asking how to make a precise launch. without coming out with a few degrees of inclination error at the end.

It kind of depends on what you're flying. Stuff like Shuttle Fleet and many vertical launchers just seem to have a slight natural error in relation to the target heading you put in the scenario file.

For winged craft, LaunchMFD can tell you your heading error during the ascent, so you can try to correct it. I find the best way with winged ships is to taxi around on the ground until I'm at precisely the right heading, instead of taking off and trying to turn to the target heading. The XR-series have attitude autopilots that make it a lot easier by keeping the roll and yaw at zero.

 

[NOMAD]

Sorry for my poor english.I ask how to make a precise launch.

 

[Enjo]

Ark told you:

For winged craft, LaunchMFD can tell you your heading error during the ascent, so you can try to correct it. I find the best way with winged ships is to taxi around on the ground until I'm at precisely the right heading, instead of taking off and trying to turn to the target heading. The XR-series have attitude autopilots that make it a lot easier by keeping the roll and yaw at zero.

Launch MFD has been adapted especially for TransX's output, ie. exactly for situations like yours. If your English is good enough ( not that mine is perfect ), try reading section 4) Usage -> Target Inclination -> c) in Launch MFD docs. The links are in my signature.

 

[NOMAD]

I see .Thanks!

 

[spacekid1998]

Hello,

When I input the LAN and INclination into LaunchMFD Tgt box, nothing happens.. Am I supposed to put a certain symbol or something?

 

[Enjo]

hi

This only means that the equatorial inclination that you want to input is smaller than your latitude, which is mathematically impossible to compute, so you would never be able to launch into orbit of that parameters from your launch site. You must pick a better launch opportunity by manipulating parameters in TransX.

Note that you input data this way into Launch MFD in ecliptic frame, not equatorial. This means that there are situations where the inclination in ecliptic frame is bigger than your latitude, but in equatorial frame it isn't.

The ecliptic frame is used in this case because it is better for interplanetary travels (TransX) and Launch MFD is just accommodating.

 

[Mogeley]

This is actually very complicated. NASA uses a program to simulate and optimize the launch trajectory. This program then outputs a list of headings and pitch changes for the launch. The program also determines the burn time and the change in velocity needed for the launch. From this they can then determine the launch window down to the second.

To simplify, your resulting inclination and LAN is a result of your initial launch heading, and time of launch. The earth rotates, so sitting on the earth's surface you intersect the target orbital plane twice a day. Once with the orbit Ascending (heading Northeast from your position) and once Descending (heading Southeast from your position).

Launch MFD is good to use to get your initial heading. It also has options for correcting your course too.