dkshema
rrProfessor
Location: Cedar Rapids, IA
| Unless the servo is perfectly centered, whenever you reverse its direction, the servo will move to what is essentially the mirror image position of where it originally was.
If it had ten degrees of clockwise displacement from neutral prior to reversing THAT channel, the servo would have to move to its new commanded position of ten degrees counter-clockwise displacement from neutral when you reverse that channel.
If you're setting up a CCPM system, use the channel reversing switches ONLY to get the servos moving correctly with respect to each other -- for instance, in that commanded roll movement, the two servos that control aileron have to move so that one moves up while the other moves down. If they both move in the same direction (both up, or both down), reverse ONE of them at the TX.
Same goes for elevator. The two that control aileron movement want to move in the SAME direction (both UP, or both DOWN) while the third servo (plugged into the ELEVATOR channel) wants to move in the opposite direction. If all three servos move in the same direction for ELEVATOR commands, reverse the ELEVATOR channel to fix it.
In order to get the servos moving correctly with respect to the STICK -- change the sign of the associated function in the swash mix/swash AFR menu of your TX.
If the swash tilts left for a right aileron command and you have +65 dialed into the aileron swash mix/swash AFR menu, change the number to -65, for example. If elevator goes the wrong direction with respect to the STICK, change the sign of the Elevator mix number from + to - (or - to +). Same goes for Collective.
-----
And generally, at neutral stick, no trims or subtrims, with a linear 0 to 100% pitch curve, collective at mid stick, all servo arms would be centered in their travel range, and in most heli geometries, the arms would be parallel to the skids (or ground).
-----
* Making the World a Better Place -- One Helicopter at a time! *
Dave |
