Abstract: A radio control device is provided that has the D/R function wherein the rate can be switched by a simple operation without impairing the operability of a stick. The adjustment value (rate) determining a relationship between stick operation amount and servo motor operation amount is switched at the changeover point arbitrarily set within a range of stick operation amounts. The rate 1 is 100% while the rate 2 is 60%. The point 1 is set to the position corresponding to about 65% of the maximum value of the stick operation amount in the right direction (or down direction). The point 2 is set to the position corresponding to about 85% of the maximum value of the stick operation amount in the left direction (or up direction). In the rate 2, the rudder does not effectively work over the range where the operation amount of the stick is relatively small. When the adjustment value exceeds the point, the mode enters the rate 1, so that the rudder works effectively.

Abstract: A method for controlling an engine for a model and a device therefor capable of improving throttle response. Feed of fuel to the engine is increased during acceleration of the engine and decreased during deceleration thereof. This permits a rotational speed of the engine to be smoothly and rapidly varied, to thereby reduce vibration of the engine and prevent knocking and breathing of the engine. Also, adjustment of a trim provided on a side of a controller leads to adjustment of a needle valve, so that the adjustment may be facilitated.