How to control yaw with a coaxial rotor setup?

[Atrocious]

I'm trying my hand at creating a nice coaxial-rotor helicopter with the new rotor system, and wanted some help with figuring out how to control yaw (horizontal rotation) in it. I read online that coaxial-rotor helicopters rotate by creating a difference between the collectives of the two rotors. My current setup has the value for the gyro's yaw controls subtracting from the gyro's up/down controls. With such a setup, when I try yawing left, my helicopter shoots straight up into the air, and when I try yawing right, my helicopter completely spazzes out and falls to the ground flailing around uncontrollably.

To those who may be more experienced with this subject than myself: what's a good way to get some yaw authority going in a coaxial helicopter?

[Philonious Rex]

I'll drop my thoughts on it till someone with more experience comes along. I think the problem is that the amount of increased and decreased collective needs to be moderated to generate exactly the same total thrust. It sounds like currently you are either adding collective (increasing total thrust) or removing collective (Decreasing total thrust)

You need to simultaneously Add collective to one rotor and subtract it from the other to maintain lift. The helicopter should spin counter to the direction of the rotor with increasing collective.

Yaw Output ------------Add block------- Collective Rotor 1
Collective Output---/

Yaw Output ----- Numerical inverter ------- Collective Rotor 2
Collective Output------------------------/

That way when Rotor 1 is getting more collective rotor 2 is getting less.

The Yaw should go from -1 to +1 I believe so the rotors will be receiving +1 or -1. If it is too strong or too weak multiply the Yaw by either a decimal or whole number respectively.

Depending on the way the game has it balanced hopefully that stays at the same altitude and maintains thrust. If it creates a changes in altitude than it may require some additional setup. But something like this could work theoretically.

Bear in mind I have not personally tested this yet, so if any one else wants to answer feel free.