torque

Hi, I've been searching post on this topic and yet didn't found much. I'm looking for a way to shut off the uncontrolable yaw on my planes. I use wheels turning in opposite directions (coaxial stuff i think) and make sure the COM is in the exact middle, behind the wings (or in the exact...

TL;DR: Attaching a brace to anything that spins causes extra unwanted torque. This torque is NOT symmetrical across counter-rotating coaxial systems (making it impossible to create a coaxial helicopter that doesn't yaw unnecessarily [without active compensation, anyway]. Skip to post #8 for a...