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I'd try with a simpler wing layout to reduce the possible amount of faults. A simple straight wing, with optional Ailerons. One set of horizontal fins at the back for elevator control Keep the vertical fins as is. Keep the CoL close behind CoM as you have it now. If you can get that to work, you can add more and modify layout until you find out what made it go wrong.

Very likely. As the CoL doesn't take into account lift and drag from parts with no Lift rating. Which also means my statement is only accurate for crafts with very few non-Lift rating parts. Torque from off center engine thrust can also be a factor.

No. If you place CoL behind CoM, then the craft will have a natural tendency to dive towards the ground unless some up elevator is applied.

Yes. It is probably not the only problem you are having, but I think it's a contributing factor. I first recorded it as a video clip, then made it to a .gif with http://gifmaker.me/

It can't be based on CoL, because moving the control surfaces moves CoL. That is actually the whole purpose of control surfaces. Moving the CoL around to make the craft change attitude. No. The pivot is CoM.

I think another issue could be the control surface that you've added to the swept wings. It appears that the axis of rotation for the control surfaces crosses the centerline in front of CoM, which used to cause them to work opposite direction of what you want.

Moved some post regarding the Wiki to its own thread.

I moved some off topic posts from Thursday.

If you Report the PM with your question, a moderator can look at it and maybe get an explanation.

And now people will forever wonder what problem it was you solved and why you didn't want to share the solution with them

When you've had 5 posts approved (not counting posts in The Lounge).

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Closed by request of OP.

Posts in the Lounge don't count towards post count.

I've rephrased the offensive term in the OP, edited some quotes and removed a few replies that, while justified, were derailing the topic. Please use the Report button instead of derailing a topic. Report this post if you have any questions or concerns regarding this decision.

Merged similar threads.

In stock Aerodynamics, all wing surfaces in KSP are completely symmetrical. It doesn't matter which side is up or down. They only create lift when they have Angle of Attack. So if your craft shows the Tail Fin as producing lift to one side, that means the fin is not moving 100% in the direction that the fin is pointing. A likely cause could be that the landing gear is buckling slightly either from load or because the parts the landing gears are attached to are flexing.

This could be caused by having the main landing gear to far in front or behind Center of Mass (CoM). To get a stable landing gear setup, you want A main gear lifting the craft as close to CoM as possible without tipping. A nose gear or a tail wheel as far from the main gear as possible. A car type layout of the landing gear, where all the landing gears are located near the ends of the craft can create the symptoms you describe. Here's a couple examples that are very stable.

I think it'd be much better to leave it for the next someone with the same issue or question. It'd be even more helpful if you replied with the solution (as an actual reply) and then marked the reply as best answer. Then it'd be even easier for others to see that there's a useful reply in there. But... since nobody has replied yet, I can delete it if you really, really want me to.

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