[B9][FAR][IR][KAS][and more] Kerbin launch issues, craft will not turn.

[SilentWindOfDoom]

Edit: I suspect a problem/limitation to do with IR.

Gentlemen, I present you with the largest payload I have attempted to launch into low kerbin orbit to date, and I find myself utterly stumped as to what is keeping me from achieving that goal. It is not a matter of thrust, delta-v or structural integrity, it's simply the fact that the craft refuses to do anything but go straight up. I have tried adding stacks of reaction wheels, removing all reaction wheel torque (including the cockpit torque), Ive even action-grouped boosters to force the craft to turn over and added side-ways firing rockets. The cargo contained one micro reaction wheel, which i have removed to no avail. I cannot make the gravity turn, so i reach my apoapsis with almost no horizontal speed. This is frustrating me to no end. Wings with control surfaces seem to make no difference either. I'm close to giving up.

The craft minus the boosters weighs about 120t.

COG + COT: http://i.imgur.com/OS53OaX.jpg

Payload: http://i.imgur.com/HTY75Ic.jpg

The entire thing: http://i.imgur.com/pple1qn.jpg

You'd think it would flip over, right? Nope: http://i.imgur.com/nX3a9y1.jpg

This last picture leads me to believe the problem lies with the cargo. It is attempting to torque the craft upright, while the engines attempt to turn it over, causing the structure to bend like it does at the end of the cargo bay. Would this be a IR (infernal robotics) issue? The cargo contained one micro ASAS node (since removed) and 1 small and 1 medium size remote control node.

Can anyone assist?

Edited September 9, 2013 by SilentWindOfDoom

[Captain Sierra]

The fact that the boosters burn out asymmetrically is a pretty big problem. Fix that, try again, and then report. If it is doing that, then there is something already messed up. Check your fuel lines and struts and give it another go. If it still torques, give us a status update.

In regards to your theory, Quantum struts is pretty buggy. I had an apollo style mission that got rooted to the launch pad because of a QS bug. If you can, try it without them. KW Rocketry has some heavy duty struts you can use if you need ridiculous strength.

[SilentWindOfDoom]

The fact that the boosters burn out asymmetrically is a pretty big problem. Fix that, try again, and then report. If it is doing that, then there is something already messed up. Check your fuel lines and struts and give it another go. If it still torques, give us a status update.

In regards to your theory, Quantum struts is pretty buggy. I had an apollo style mission that got rooted to the launch pad because of a QS bug. If you can, try it without them. KW Rocketry has some heavy duty struts you can use if you need ridiculous strength.

During a normal launch the boosters would run out a the same time, i switched the right booster off to see if I could turn it with brute force (asymmetric thrust), the fuel flows as it should. As for the QS, I will try to build a version without them, though securing the cargo without them will be a challenge.

[Captain Sierra]

Securing a payload without QS isn't very hard but getting it to not wobble after redocking . . . well, that's different.

[eurybaric]

I second that this is a QS bug. Anyway let us know if it works out.

EDIT: And if it really is the case consider posting the QS mod dev about this bug. Cheers

Edited September 8, 2013 by eurybaric
editing

[SilentWindOfDoom]

It would appear it is indeed the Quantum Struts to blame, specifically the ones on the cargo bay craft I imported using sub assembly manager. Once i turned those off in flight, the rocket is more than happy to flip over and burn, as it should. Thanks everyone for your help.

[eurybaric]

You're welcome! But please change the title to "Answered"