Symmetric Rotation

[Bolche]

While designing my awesome 100% recoverable shuttle, I ran into a problem while rotating the boosters' Mainsail engines to compensate for the unbalanced CoM.

It is inspired in the design of the SpaceMaster, with two orange tanks attached to a Probe Core that is attached to the spaceplane I want to launch. You can see result in the picture below:

To achieve the intended result, both engines should rotate toward the spaceplane, but one rotates "inwards" and the other, "outwards".

I tried to change the symmetry mode to "Mirror" but when I attach the engine to the tanks, it automatically changes back to "Radial".

I tried removing the tanks and changing their symmetry, but ended up either with one engine on the top of the rocket and the other at the bottom, or the parachutes and Vernor engines (that are attached to the side of the boosters) at different positions, one "inward" and the other "outwards".

While designing this craft, I made the boosters at the VAB, the spaceplane at the SPH, and merged then at the VAB. Not sure if that affected something.

The strangest thing is that at an old save I had the exact same design on an older KSP version and it worked all right! KSP 1.0 if I remember correctly. But this craft was made from scratch in this save and is slightly different.

Running KSP 1.0.4, 64bits, Linux, with several mods

Edited November 8, 2015 by Bolche

[Snark]

I tried to change the symmetry mode to "Mirror" but when I attach the engine to the tanks, it automatically changes back to "Radial".

The problem is that the orange tanks themselves were attached using "Radial" symmetry, so the game is forcing the engines to follow the same symmetry mode as their parent parts.

To fix this, dismount the entire radial subassembly including orange tanks, radial decouplers and everything, then put it in Mirror mode, then reattach them and you'll be good to go. If you have problems with the various bits that are attached to the tanks (like Vernors and such), you may need to re-build them and re-add those bits after setting up the mirror symmetry.

[Guest]

To add to Snark, you can use 'r' if you don't know how to do that.