Could I use a Futaba Remote Control to control wirelessly a motor and two servos connected to an arduino/Motor Shield? For an RC Car.
(2.4GHz FHSS Futaba 4YF 4-Channel Transmitter)
Yes. The output of the receiver is servo pulses, roughly 1000 to 2000 microseconds across the control range. You can use the pulseIn() function to read each radio output.
You would need to include the corresponding RC receiver inside the vehicle.
Unless the Arduino is going to modify the received signal in some way, there seems no advantage to using an Arduino+motor shield compared to the cheaper and simpler approach of using an RC speed controller directly.