Electronics questions

[Espeefan]

Your ESCs would plug into the receiver, however they will not be drawing their power from (or through) the receiver. They will get their voltage from the main battery pack you choose to run the model with. So when you wire up your ESCs, all of them will have to connect to the main battery pack, in parallel. You could do this a few different ways. One way would be to make a Y-harness that splits the battery pack's leads into 2 or more leads, with each lead going to the input wires of each ESC. Another thing you could do is run the battery wires into a terminal strip, and then branch the multiple circuits off that terminal strip to each ESC.

Your ESCs typically supply power to the radio receiver, not draw power from it. BEC stands for battery elimination circuitry, so any ESC with an internal BEC can power your receiver, and you will not need any extra battery packs for that. You can run the model, and all the associated on board electronics, with the main battery pack.

When do you need an external BEC then? When you start to run a lot of high power servos off the receiver. Often times an ESC's internal BEC can only supply 1 to 5 amps of current to anything else plugged into the receiver. A couple high torque servos can easily over tax the internal BEC, causing the ESC to glitch or shut down (thermal) so by running an external BEC, your ESC is free to just run the main drive motor and life is good.

When I mentioned you might not need an external BEC, I assumed if all your servos are going to be driven by the ESC, you will basically be treating each servo like just a regular drive motor. These servos will not need to be plugged into the receiver at all. Your ESC will be handling the control (speed and direction of rotation) and the voltage they get.

If you think you want to run a couple servos, as true servos, off the receiver to lift a blade or ripper for example, then you might want to think about adding an external BEC for that. These ESCs you are looking at have very weak internal BECs (at just 1 amp).