Apollo 13

[dunebugmi]

Is this thread/challenge still alive?  

 

I did something similar for an apollo challenge recently so I thought I'd submit it here if the thread is still alive.  The rules are not exactly the same, so please give me some feedback on what I should do differently here.

it looks like I still need to:

land my rocket on the moon, 

simulate the engine going out early- I don't understand how to do this part.  At what point in my trajectory should the engine go out?  before orbit?  burning from LKO to the moon?

perform the burn without instruments

 

Any other suggestions?

 

How does one make a video out of this stuff?  I only know how to take screenshots.

 

here's the other thread I mentioned , and below that is my draft submission (on imgur)

 http://imgur.com/a/476Qk

[Vanamonde]

That other thread's last post was 4+ years ago, so it's pretty definitively not alive.

Your post has been moved to its own thread. Feel free to edit the first post and title to revive the Challenge idea. 

[sgt_flyer]

7 hours ago, dunebugmi said:

Is this thread/challenge still alive?  

 

I did something similar for an apollo challenge recently so I thought I'd submit it here if the thread is still alive.  The rules are not exactly the same, so please give me some feedback on what I should do differently here.

it looks like I still need to:

land my rocket on the moon, 

simulate the engine going out early- I don't understand how to do this part.  At what point in my trajectory should the engine go out?  before orbit?  burning from LKO to the moon?

perform the burn without instruments

 

Any other suggestions?

 

How does one make a video out of this stuff?  I only know how to take screenshots.

 

here's the other thread I mentioned , and below that is my draft submission (on imgur)

 http://imgur.com/a/476Qk

you should rephrase what you want to accomplish, now it has been taken out of the original thread, for better clarity  if it's still an apollo 13 recreation you want to do, apollo 13 was not sent on a full free return trajectory (still a fast transfer, but not a free return), because they wanted to land elsewhere. - the lox tank explosion + engine damange on the apollo service module happened during the coasting phase between the earth and the moon (after transposition + lem extraction from the S-IVB stage) - as they were not on a free return, they had to use the LEM's engine to adjust the orbit to get on a return trajectory (+ they had to perform later during the coast back to earth an instrumentless midcourse correction.)

also, apollo 13 center engine on the saturn V second stage was automatically cut-off earlier than programmed (the center engine would still have cut-off earlier than the 4 others, but this time it cut off too early)  - to compensate, the 4 outer engines burned longer. a simple tricks for mimicking early engine cutoff in ksp either click the engine and shutdown it, or radially attach small fuel tanks to the main tank, attach the outer engines to those tanks, and feed those small tanks from the main tank. when the main fuel tank is empty, the center engine will shut down, while the small auxilliary tanks of the 4 outer engines will still have a small amount of fuel to continue burning a little longer

Edited March 5, 2016 by sgt_flyer

[ihtoit]

You might find this useful. As you can see from the image, the LOX tank blew after the outbound midcourse correction which threw the craft off course. You can get the same effect by jettisoning a full size 0 LF tank and detonating it with a Whack-A-Kerbal. Thus a second burn was needed to bring it back on course. The burn at 79h27m was made prograde to ensure a return trajectory, rather than retrograde which would have closed the lunar capture and set the craft up for circularisation and descent orbit. The final two burns were done using pencil and slide rule to correct the HUGE misburn at 79h27m which would otherwise have occurred a few days later from the back side, with much lower dV requirement, to put the CSM/LEM on a perfect coast to re-entry.

 

[XpertKerbalKSP]

6 hours ago, Vanamonde said:

That other thread's last post was 4+ years ago, so it's pretty definitively not alive.

Your post has been moved to its own thread. Feel free to edit the first post and title to revive the Challenge idea. 

I posted that challenge a week ago.....