Gaspar has them on his site, and lists them as 6v as I recall. As far as hooking it to the Rx... sure you can. But you will have to build a control board to watch where the signal is, and then switch power to the solenoid. You could probably take the board out of an old analog servo, and make it work. You could hook the solenoid to the motor wires, and use the pot for the "Dead point". (or off)