Thank you for the reply. The ESC thing makes a whole lot more sense now.

So, about this gyro, I've heard that with the HH ones, you can turn off and on. This is usually next to something about mixing on the Tx. What is this all about? Some sort of compensation for yaw taking place at the Tx is my best guess. I've also read about copters that employ more than one gyro. What gives? It would sound like they are using one for each plane (x,y,z - not airplane).