It is a remote controlled "robot" project my son is doing at uni with a group... They have been given a ready made PCB consisting of a few power resistors and a servo to allow some sort of contact to wipe over the raw PCB copper tracks and provide voltage to the wheel's motor, reverse and forward, full speed and half speed. I find the idea of a servo motor being used as a wiper similar to the mechanical distributor in older cars, with crudely made contacts (wires, solder blobs, graphite brushes) wiping over the copper tracks and getting caught and worn over the gaps...
So I thought why not have a little arduino board that will connect to the RF receiver and intercept the 3 wires destined for the servo motor, I presume it only needs to use GND and Signal, no need for the 5V line, and then the arduino will read and interpret the requested position and based on that it will drive a couple of relays (or SSRs) to power the wheel's motor.