RE: 4.8v or 6.0v rx battery power
If the servos you are using are old stay with the 4.8 pack. I had old JR servos in my quarter scale and they locked up with the increased voltage. Most newer servos will handle 6 volt, and with a sport plane you will notice the diff. Most of my bigger planes will be changed to 6 volt because I am running digatal servos. They use more voltage. A better charger would be good too. Most of the smaller planes do just fine with a 4.8 pack.