One more thing that wasn't mentioned yet is you can take the same 9C and drop in a 75MHz module and use it for cars/boats/robots. You will need to get a RX on 75MHz, as THE 72MHz RX CANNOT BE USED WITH THE 75MHz TRANSMITTER WITHOUT HAVING IT RETUNED. I'm getting one on 75MHz for my boats and getting a 72MHz synth module and RX later for the aircraft I'm working on. This lets me use one TX for everything, much cheaper than buying complete new radio sets for each new project.