RE: Airplane rudder gyro
JR has converted one of their heli gyros for airplane use - the G370A. Download the instructions because it is a real good read. This is a rate only gyro, and is directed to those who compete in the Top Gun competition here in the States. The G370A is,made to work with IC powered planes.
For wind, i have experienced at minimum of two gyros that are needed. In order of importance, aileron gyro, and of second importance would be the elevator gyro. A Rudder gyro is more helpful in preventing ground loops.