How to fix structural integrity in my design

[Pawelk198604]

I just want to build rocked carrier to send lander can to orbit, where i plan to dock it with CSM like in Constellation Design.

I just placed two orange fuel tanks and Mainsail engine clustered with 6 SRB and 6 RT-10 beneath, i reached 150 altitude.

I decided to make additional stage, i separated two orange tank and i add new Skipper engine. Now i have structural integrity problem.

How to fix this

here screenshot

and my spacecraft: https://docs.google.com/file/d/0Bx2uGwZ4w808ekUwbVdyY0xrVFk/edit?usp=sharing

[Pawelk198604]

I fixed it be using using structural struts, i just long time since i played KSP, and must to learn again :-)

[Uberick]

Build a piece of scaffolding around that joint if that's what's collapsing. From the bottom orange tank, put an i-beam or equivalent with 3 or 4 times symmetry just below your decoupler. Then, on the top orange tank, do the same thing. Then, connect the ibeams with struts. This will transfer the stress around that joint, and hopefully stop your craft from collapsing.

Image as example:

http://i.imgur.com/FhVd725.jpg' alt='FhVd725.jpg'>

Hope that helps!

[CalculusWarrior]

I say to add struts from the SRB's diagonally up to connect with the main fuel tank. Possibly you could also do what Uberick did, only with the tiny cubic structural pieces; I find they are lighter and more minimalistic.

[GateCrasherVI]

Here is how I fix structure rigidity problems from length.

The plates can be added or removed for convenience in placing the struts.

The whole thing can be repeated to increase the weight distribution if necessary

Remember that off-center radial connections (like those struts. or fuel lines) will cause "spin"

[Vanamonde]

Those big struts are fairly massive. Small hardpoints will do the same job for a fraction of the weight.

[Anglave]

1) You can use the "small cubic" struts to do like the images above, with much less weight. Just attach them radially around your tanks and then connect them with struts.

2) You should be able to "stitch" across each joint between fuel tanks, or between fuel tanks and decoupler rings, even without any struts or other objects. Use 4x radial symmetry and try stitching every single joint. Like you've done in your screenshot except shorter struts, just across the join. If the strut won't go where you want it, try again one "click" left or right from that spot. (Oh yeah, do this with 'snap to angles' on.)

3) Use a smaller decoupler ring (even though it won't look right), and then stitch the tanks together across the gap.

[Vanamonde]

Although the failure ratings listed in the VAB info CLAIMS the cubic strut is stronger, I have had problems with them failing or simply falling off. But I swear by the small hardpoints, which never seem to fail. In fact, they are often the only intact parts left after a crash. I love those little things. And while it is possible to stitch struts directly across abutting pieces of the same diameter, placing them is kind of a pain, and god help you if you ever decide to move them, because the little terminus nubs can be partially or entirely submerged within the fuselage pieces, where they are almost impossible to grab again. So I'm not saying Anglave is wrong, but I do advise differently. (No offense, I hope.)

[nhnifong]

The trick is to use numbers of struts that are divisible by the number of edges on the mesh collider of both parts you are strutting together.

tanks and most other things have 12 sides on their node collider. then you can always place say, 6 struts on the edges that stick out. However, the 2m decoupler is wider and has a different number of sides possibly, and requires some fenagling.

[Pawelk198604]

I placed lander on orbit, but now i have problem with my Mun rocket

i put bloody structural struts in every possible place between first and second stage but parts still colliding.

Can someone look at this

https://docs.google.com/file/d/0Bx2uGwZ4w808UGNFdFY5VW5XVmc/edit?usp=sharing

I use MechJeb2

[Nao]

I placed lander on orbit, but now i have problem with my Mun rocket

i put bloody structural struts in every possible place between first and second stage but parts still colliding.

Can someone look at this

https://docs.google.com/file/d/0Bx2uGwZ4w808UGNFdFY5VW5XVmc/edit?usp=sharing

I use MechJeb2

Witam przerobiłem nieco struty, poszło na orbite bez problemu. http://www./?gv0vre3ryi2135e

Pozdrawiam!

I used only 3 struts for the middle stage, and two struts for each solid booster. It wobbles a little but nothing serious, hope this solves the problems .

I think the issue was that there no connection between blue decoupler and orange tank.

Edited May 30, 2013 by Nao

[zanzibar196]

Here is a very stable, heavy lifter that is similar in design to yours... maybe you can compare the two to see how to improve your design?

Proof that it gets to orbit, and beyond:

NOTE: This uses all stock parts, and no mods like Mechjeb!

[Pawelk198604]

Witam przerobiłem nieco struty, poszło na orbite bez problemu. http://www./?gv0vre3ryi2135e

Pozdrawiam!

I used only 3 struts for the middle stage, and two struts for each solid booster. It wobbles a little but nothing serious, hope this solves the problems .

I think the issue was that there no connection between blue decoupler and orange tank.

Dzięki sprawdze