Jump to content

Apollo 13 movie orbit ?


roarke
 Share

Recommended Posts

1e70u8.jpg

I\'m mistaken or this photo taken by me from the movie is a different orbit than a orbit made with KSP ? I never got to the moon, btw. As i understand, when you are close to reaching the moon, in KSP, a new part, so to speak, of orbit (a new visual line of orbit) is made.

Link to comment
Share on other sites

its kinda possible to do that, but it will look more like this (flatter at the mun end, also my skills with paint are rubbish at best ;P), given enough time and preparation I reckon someone would be able to do it picture perfect

QGGu8.jpg

Link to comment
Share on other sites

I\'ve done that kind of orbit by accident, but I think that the way gravity works in the game makes it harder to achieve. That path gradually transitions from a stronger influence by earth to a stronger influence by the moon, whereas in KSP you reach a hard boundary and just 'fall' from there. Wouldn\'t NASA\'s trajectory serve to help you shed the velocity of transit? As you approach the body from ahead, its gravity would slow you down, whereas Mun speeds you up as you overtake it from behind in a typical KSP intercept path. I think.

Link to comment
Share on other sites

This maneuver is called a Free-Return trajectory, and it should be perfectly possible in KSP, however, it takes careful aiming and some setting changes to visualize properly.

Also, that figure is using the Earth-Moon rotating frame, where both the Earth and Moon are static in relation to one another. In KSP\'s single-body reference frame, the figure eight will look different, because the Mun will be moving relative to Kerbin.

To see that sort of trajectory on the map, you\'ll need to tweak the settings.cfg file and set these lines like this:

CONIC_PATCH_DRAW_MODE = 3

CONIC_PATCH_LIMIT = 3

That puts the patched conic renderer in \'relative\' mode, and increases the patches-ahead draw limit to three, so you can see your exit trajectory after you leave the Mun\'s SOI.

Should be easier to do a proper free-return with those settings. :)

Cheers

Link to comment
Share on other sites

I find that swinging by the Mun in such a way that i again end up in Kerbin orbit isn\'t all that hard, i suppose the careful aiming is in getting Kerbin orbit nice and low so that it\'s easy to perform aero breaking or whatever method of deorbit one prefers.

Should it look something like this?

(both Mun and Kerbin periapsis are at ~370km)

Link to comment
Share on other sites

The purple orbit is the 3rd trajectory; after the escape trajectory with the *next* celestial body (in the screenshots i\'m still in the first part of the trip, on the way from Kerbin to Mun).

It\'s enabled by the lines for settings.cfg that Harvester provided.

Link to comment
Share on other sites

It\'s not perfectly achievable because KSP doesn\'t simulate physics the same way our universe works. In the real world, we always feel the tug of the Moon, no matter how far it is, and its attractive force increases as you get closer. In KSP, the Mun only exerts a gravitational force once you\'re within its SOI, which serves as an approximation of real physics. You can achieve a similar maneuver in KSP, but it\'ll never be quite as smooth.

Link to comment
Share on other sites

Can someone explain what

CONIC_PATCH_DRAW_MODE

CONIC_PATCH_LIMIT

Does? How many draw modes are there? I\'m using harvesters settings and they\'re awesome, much better then the original, I can see where my entire journey will go!

Link to comment
Share on other sites

Can someone explain what

CONIC_PATCH_DRAW_MODE

CONIC_PATCH_LIMIT

Does? How many draw modes are there? I\'m using harvesters settings and they\'re awesome, much better then the original, I can see where my entire journey will go!

CONIC_PATCH_LIMIT is the upper limit on how many conic section patches will be drawn. eg: 1 will only show your trajectory in your current SOI (compare with 0.13), 2 will show your current, and next, etc. There\'s little to no need for more than 5 at this time.

I\'m unclear on what the different draw modes do.

Link to comment
Share on other sites

Can someone explain what

CONIC_PATCH_DRAW_MODE

CONIC_PATCH_LIMIT

Does? How many draw modes are there? I\'m using harvesters settings and they\'re awesome, much better then the original, I can see where my entire journey will go!

You explained it perfectly:

It\'s awesome, much better, helps you see where you are going.

Link to comment
Share on other sites

This thread is quite old. Please consider starting a new thread rather than reviving this one.

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.
Note: Your post will require moderator approval before it will be visible.

Guest
Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

 Share

×
×
  • Create New...