Why Fit Throttle Limiters?
On the face of it, throttle limiters seem crazy. Even after much consideration, they still seem crazy. They make the transmitter awkward to use with the Hoverfly (and other electric models), and reduce throttle resolution on all models by squeezing the throttle range into less than full joystick movement. The only semi-explanation I have been able to come up with is that the limiters force the modeller to rig up the model’s throttle mechanics (cranks and pushrods) to use only the central part of the servo’s angular range. The linear displacement of a pushrod is roughly proportional to the sine of the crank’s angular motion; pushrod movement is therefore a fairly linear function of servo rotation in the centre region, say between +/-45º. Outside this range pushrod motion falls off rapidly, dropping to zero at the crank dead centre positions. A precise relationship between joystick position and engine throttle setting is crucial on many models, especially helicopters, so proportional act
