Instant Orbit issue

[Crowley]

Just to clarify, I *DID* do a search on this and have used it before in the past with smaller 'space stations' & modified the file for an instant orbit. The topics seemed to be un-accessible to me and in fear of reviving an old thread, I didn\'t want to run the risk of being banned/beat up. But it appears when I use a \'pretty large\' 'Space Station' that I have created, it ALWAYS tumbles then explodes onto itself (very LOW FPS, obviously). I have managed to get a much smaller version (basically the middle section) into instant orbit, no problems.

Here is my SS I\'m trying to put into orbit:

I wasn\'t able to get a reliable screenshot after it blew up (onto itself), but there was quite a few dozen debris items floating around afterwords (normal FPS). Maybe you guys would know better than I would but *I\'m* thinking that maybe its a combination of a mod issue along with too many parts combined. I\'m not sure, that\'s why I\'m asking the experts. Any help/ideas would be appreciated.

[Zephram Kerman]

When something I\'ve built refuses to stabilize but tumbles uncontrollably, it\'s usually because two parts are overlapped. If the thing doesn\'t explode immediately, it instead stretches and bounces around, resulting in massive torque forces.

For example, I built a launcher for the cart mod, but didn\'t notice the wheels can move into some fuel tanks. This problem didn\'t show up until halfway through the gravity turn, when suddenly the wheels were bouncing around 100m on either side of the ship. (Not good for the cart suspension!) This movement made the ship tumble more and more until I ejected the colliding parts, but then it was ok.

edit: On a second look at your ISS, I think I see some modules connected into a square formation. I\'m not sure if this is a problem in KSP, but some physics programs (i.e. Phun) will freak out over circular connections. Little oscillations repeat around the loop and slowly amplify without limit, causing things like wiggles, explosions, and perpetual motion machines:

.

[Crowley]

When something I\'ve built refuses to stabilize but tumbles uncontrollably, it\'s usually because two parts are overlapped. If the thing doesn\'t explode immediately, it instead stretches and bounces around, resulting in massive torque forces.

For example, I built a launcher for the cart mod, but didn\'t notice the wheels can move into some fuel tanks. This problem didn\'t show up until halfway through the gravity turn, when suddenly the wheels were bouncing around 100m on either side of the ship. (Not good for the cart suspension!) This movement made the ship tumble more and more until I ejected the colliding parts, but then it was ok.

edit: On a second look at your ISS, I think I see some modules connected into a square formation. I\'m not sure if this is a problem in KSP, but some physics programs (i.e. Phun) will freak out over circular connections. Little oscillations repeat around the loop and slowly amplify without limit, causing things like wiggles, explosions, and perpetual motion machines:

Thanks for the reply Zephram Kerman. After reading, I think I have an idea of what it is.. possibly 2 things: 1) \'spacers\' between some of the \'pods\' and 2) possibly different \'pod\' lengths may not \'properly\' reach. I will take a look at it later on tonight & rebuild it. I\'m guessing \'those\' could be the cause of the \'infiite & amplified oscillations\', which I did notice before it blew up (ie, spun & tumbled faster & faster until.. BOOM).

I can\'t wait to see when they implement the weight, TWR, etc etc into the VAB. Hopefully they\'ll also show some type of \'high stress\' areas as well.