Whats Dual Rate???

[balang_479]

never used it before or changed its setting (because i didnt know what it was).... so

what is it ?

[davec-nitro-rs4]

It decreases the amount of steering servo travel to make your car less twitchy if you are prone to oversteering. It will however take away maximum throw on the steering and inhibit your ability to turn tightly....makes it easy to adjust to your track conditions and driving style.

[terrible-t]

Another way to describe dual rate, the way davec explain it. The way I could explain it, the differance in on/off road course the track, tight or wide open, or ovals. It's easier to adjust dual rate on a oval. Adjusting the D/R to keep the car on center line(minimum adj). you'll find at maximum adj. it is hard to keep on a center line of track. come to driving style you're confortable at. On/off road just adjust to keep centered line on track. oversteering causes the car to spin out on corners, D/r could rectify the problem. And more consistant driving.

I probably restated davec post. But hope to open up your question.

[Ryan Lane]

Dual rate will limit the travel or "throw" of the servo. This is the back and forth or left and right movement of the servo arm. There are usually two reasons to adjust dual rate. The first would be that the car is over steering. That is to say that when you corner hard on the track the car tries to turn in to sharp and spins out. The other reason to adjust dual rate is steering over throw. If you place the car on a nice flat, even surface and slowly turn your transmitter wheel while watching the front wheels of the car turn you will usually notice that the wheels stop turning but the servo continues on stressing the servo saver. Dialing back the dual rate will take the stress off the servo that could leed to a dead servo after prolonged exposure to this condition. Remember that dual rate dials back an equal amount of throw on both sides from neutral. EPA or end point adjustment will independently set the throw to both the left and right side. Hope that helps.

[trailranger]

I really thought Dual Rate was a ratio used to tame or quicken the servo response.

Example 1, D/R of 125% turn the wheel 15 degrees and the servo throws 18.75degrees.

Example 2, D/R of 50% turn the wheel 15 degrees and the servo throws 7.5 degrees.

So yes with a D/R less than 100% will remove some of the servos maximum end point.

To save the live of servos, always adjust the endpoint to prevent binding. This way you can have a higher D/R for response but not overwork the servo with binding.

You can adjust EPA(End Point Adjust) with some radios in the mid to upper range or with the servo horn. To adjust endpoint with servo horn, you just need to have the ball stud closer or farther to the center.

If your servo is binding, just keep moving the ball stud closer to the center of the horn. Hitec makes an adjustable servo horn with .5mm increments. You can use that to get the ball stud just right.
Warning about moving the ball studs in/out.
The more you move it in, the less responsive the servo is at turing the wheels but you will have more torque. Adjusting the D/R higher will help solve this.
The more you move it out the more responsive the servo is but with less torque. Adjusting the D/R lower can help fight the twitchy feeling.

[Ryan Lane]

Trailranger, Futaba describes dual rate as follows:
This function adjusts the + side when the servo travel is insufficient due to understeering and the - side when servo travel is excessive due to oversteering on corners while running. Operation: simutaneously adjusts the travel of bothe the left and right steering.
You may be thinking of Expo, which operates similiar to what you stated above.

[terrible-t]

EXP & EPA are done in Pit area for adjustment. D-rate w/ wheel adjustment on tx is used for on-the-moment time while driving the coarse. To tune your driving style on track adjustment.

[trailranger]

I may have to recheck my manual, but Dual Rate is it describes, its a ratio function of the wheel input to the servo throw. Which is why I had mentioned you can use the D/R to affect end points. Yes there is expo which affect the servos transit and response based on a exponetinal functional. And there is EPA which you can individually adjust left and right end points.

[balang_479]

oh so thats what it is... I use it all the time but had no idea thats what it was called until i read it on radios and stuff..

thanks guys.