How to mount multiple engines on one fuel tank

[recursiver]

So I have seen several designs that have, say, four nuclear engines mounted on the bottom of an orange fuel tank, similar to the picture below. I have tried to be able to do this in the VAB but cannot figure it out. Can anyone tell me the secret to this?

Edited June 1, 2013 by recursiver

[gilflo]

Same question for me. I would be happy to know how to do it. I also tried in the VAB but I can't figure out how to proceed....

[Atanar]

It's the small cubic struts, sometimes even clipped so they use the upper attachment point. You can do that cause they are fuel crossfeed capable.

[shand]

You can do that cause they are fuel crossfeed capable.

... but its always worth double checking all engines are getting fuel before flying off to jool. i tend to use fuel lines on all of them just to be sure.

[Uberick]

Like this:

http://i.imgur.com/24dhZc0.jpg' alt='24dhZc0.jpg'>

Put the cubic struts with four times symmetry around the edge of the fuel tank. Then you can snap engines to them. If you space them out enough, you can fit a fifth engine in the middle.

Usually however, it's more efficient to put a skipper engine on a stack of tanks than a series of LV 45s or 30s.

[Finnerty]

I just discovered this was not a mod the other day, someones video I think I saw it on. I tested it with ion engines. Where I could only place one, now I have 4 using the cubic struts.

[HamekEisenfaust]

If you use the aerodynamic tailcone, flip it upside down, and nest it inside the large orange tank, it will give you the effect you are looking for. Noted from the NOVA SHLLV in the ships forum.

[recursiver]

Awesome, thanks for the tips everyone!

[WhiteWeasel]

Yep, cubic octos' are your best friend. Figured it out myself on my first days of KSP