Originally Posted by
Granpa
I was talking about a mechanically true set up. No radio adjustments.
The reason that your procedure will not give you a true set up is what we used to call differential when we set up our r/c helicopters. This was used to give us more throw in one direction than the other.
The reason is simple geometry as niznai alluded to. What you're saying is geometrically(?) impossible. Just draw it out and you'll see. Draw to circles with a compass or something that will give you perfectly round circles. Mark the center and place a dot in one at 90 from the horizontal. On the other, place a dot at say 75 or if you want at 105. Now rotate each of the dots approx 30 degrees. Measure how much each do moved on the horizontal axis and you'll see the dot placed at 90 will have moved linearly the same amount towards each side. On the dots off from 90, they will have moved less in the direction of rotation and more opposite on the horizontal axis. Also they will have moved less than the 90 dot in the direction of rotation.
That's as simple as I can make it. This is not theory or opinion, it is geometrical fact that's been established for hundreds, if not thousands of years. If you want to dispute this, your argument is not with me.
No argument needed. Mine is off a little, but I am not using the entire swing range of the servo so the turn radius for the car is the same left and right.
If the full servo swing range is required, I too would need to perfect the alignment. But in such case I will still want to have some margin in the swing, so I would use a longer servo arm and electronically limit the swing via EPA, resulting in the same turn radius let and right.