See: KO Propo

KO Propo have introduced the new EX-RR ST2 2.4GHz 4-channel radio. Based on the EX-RR radio, The EX-RR ST2 radio features a new angle sensor which was particular about the durability and the feeling of operation for both steering and throttle. It prevents deterioration of durability and operational feeling due to wear, which can be said to be the problem of contact sensors. Along with smooth operation feeling by smoother sliding, the new sensor realize high durability that is approximately 100 times compared with the prior sensor. Therefore, the best feeling of operation can be maintained for a long time and in addition, the new sensor outputs a more linear signal to the transmitter.

  • Increased the number of ball bearings that support the steering shaft for higher accuracy.

The number of ball bearings supporting the steering shaft has been increased from one to two. The double-support type supports higher precision operation and reliability.

  • The soft spring can be operated with a constant tension.

The normal spring included in the extension unit has been modified. The previous spring used was a progressive spring becoming stiffer as the wheel angle increased, but the new softer spring give a linear stiffness as the wheel angle increases. Since the spring tension can be adjusted, you can set the spring tension to your personal preference.

  • The newly designed throttle unit has increased the direct feeling.

Renovating the form by lengthening the throttle trigger and operational angle. In order to not influence the operational angle, the distance to the finger from the angular sensor has created a more direct feeling while maintaining a compact and comfortable size. With the direct feeling of the throttle/brake reaction when moved, the increase of this linear feeling allows for a smoother and quicker reaction with input on the throttle and brake.

  • Spring Tension Adjustment.

Trigger spring tension = personal preference. The new trigger unit provides a spring tension adjustment with a screw. This allows for a stronger or softer spring tension according to personal preference.

  • The long life period of the angle sensor’s smoothness does not change.

The new angle sensor used has proven to give a precise signal and shown durability. Because the signal is very precise, delicate movements are very fluid. The durability of the new sensor has shown approximately an improvement of 100 times over the past sensor used. Small operation feeling of the fingertip translates into a smooth and linear output to an ESC and servo.

  • Calculator has rollout calculation.

Function>System>Calc: This new function has been added to the calculator in the EX-2. Put Tyre Diameter in the calculator and the roll out (car movement distant per one motor rotation) is automatically calculated. This is useful for changing gearing in a DD car.

  • New Push Control Function for Direct drive car.

Throttle>Push: A motor that has a strong magnetic force will add a braking effect when the throttle is released and will make a car stall in the corner. Setting the amount of forward input to remain on the throttle as the trigger returns to neutral can be adjusted. This is effective for F1, WorldGT and 1/12 category of cars whose gear ratio is small.

The EX-RR ST2 2.4GHz radio is available with on or two KR-418FH receiver, as well as with one or two KR-418FH receiver.