Iv heard this but have no idea what it means, well Im pretty sure it jus means that the plane will be more aerobatic and the flaps will move more but how do you actually change it?

Is it something on the TX? iv been looking to do it with the planes on RF but cant figure it out

The term means either increasing or decreasing the amount of movement on given control surface.

For example if your elevator has 1/2 up and down movement from neutral then making the surface move 3/4 would be increasing the throw and making it move 1/4 would be decreasing it.

It can be done mechanically by moving the pushrod in or out on the control horn or on the servo arm.
(moving the clevis to a hole closer to the control surface on the control horn increases the throw moving it away decreases it. On the servo side the opposite is true moving the pushrod close to the servo spline increase throw moving it away decreases it)

Some radios have end point adjustment and or a dual rate setting that allow you do it electronically.

Hi!
You just alter the position where linkage fits the servo arm (or controll arm on the elevator or siderudder).... moving the linkage in on the servo arm....you get less throw....move it out...and you get more throw ( and gearbox play...so be careful what you do).

The general rule in installation of servos in ANY vehicle is to have as short servo arm as possible (to avoid gearbox play)...and to have as long control arm as possible.
See pictures of my Q-500 pylonracer.
Regards!
Jan K
Sweden

on real flight you just switch the dual rates switch to change the throws