RE: HV servos with stock RX??
Any Rx that does not state HV is rated up to 8amp. Most Hv, digital, and even high speed servos combined (2 or more moving simultaneously) will over load the Rx. Not to say it can not be done, for example a servo rated a lets say 200oz will not pull full amps if the linkage is set up on the short side of the servo and the long side of the control surface. Hook the servo up at 1-1/4 and the control horn at 1/2 and one will most certainly short the servo. Servos are rated at the 1" linkage mount hole (with exception to a couple, savox being one), go 3/4 and the torque is reduced by 25% thus reducing the load and amps. These are the reasons many well experienced pilots speak so much of set-up.