RE: Change from 4.8v to 6v
I use a 6 Volt 5 cell pack (AA Size) in my boat (2100MAH) with Futaba FP-S10 Servo, Hitec 715BB, And Hitec 645MG, running through a Futaba 127DF receiver. It works great and gives me a good 4 to 5 hours constant on sail time before needing a recharge or battery swap. Plus the 6V offers a lot more speed and tourque in the servos than the 4.8V Pack I originally used.
Chris