Check out the New Futaba S.Bus digital 7.4V servos.
Futaba S3070HV MG
Futaba S3071HV MG High Torque
Futaba S3072HV MG
Jeti Dual Receiver Input Switch EnLink 2RS
The Jeti EnLink 2RS is designed to significantly increase safety and reliability of the radios systems by using them in parallel configuration. Also can be used for teaching and training of the students using two different radio systems.