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Both joystick and heli use variable resistors (pots) so get a transmitter, a joystick, and rewire the pots from the joystick to the RC transmitter circuit.
I modified a joystick to fly an IC rc helicopter for a guy who only had the full use of his right arm. The joystick was used to interface with a typical rc tx and the pots in the joystick were hardwired to the pc board where the original transmitter stick pots were wired. Pots must be the same values of course. Second problem is that the joystick doesnt turn the pot as far as a conventional rc transmitter stick so end point adjustments (travel adjust ) must be used so this means the use of a computer transmitter
This isn't a new idea, and there are several ways to do it:1. find an RC transmitter with a computer interface. software on your computer will interface to your joystick and convert those signals in a format that can be sent to the RC transmitter2. use a wireless digital interface to your flyer (bluetooth, zigbee, wifi, etc), and have the controller on your flierr convert the incoming commands from the base computer with a joystick to servo control signalsHere's a picture of a bunch of quad rotor flyer transmitters under computer control at MIT Aerospace Controls Lab -http://vertol.mit.edu/images/five_vehicles_and_transmitters.jpg
You should use a laptop (so you could fly outside) and a bluetooth booster, allthough the laptop will just stand there while you controll the heli with ure joystick that the idea right?
find an RC transmitter with a computer interface.