Originally Posted by
glennhl
My son runs fine using his Flysky radio. But it depends what you are used to. 20 msec is .02 seconds and at 30 mph the car will move .88 feet during that time. Change that to 3 msecs and the car moves .132 feet, so it's a difference of 3/4 of a foot. That seems like a lot until you realize that you can adjust your driving to accommodate that. You just turn in 3/4 foot earlier. The biggest problem would be if you switch between a fast radio to a slow radio, it will take some time to adjust.
Your math assumes that the latency is the same each time. It's not. Your control input is not synchronised with the update window, it's sampled. So your input can happen at the start of the window or the end. That 3/4 of a foot is random, if you try to pre-empt it you might turn too early.