Eddi E. aus G. Senior Heliman Location: Gerlingen. Germany.
| 90 with 3 or 4 servos has interactions, 120 with 3 also.
When 90/4 is not setup properly, you may notice the servos working one against another causing them to strain the rx battery and their electronics and gearing.
With 120 the servos don't fight each other, but you'll maybe notice some strange behaviour of your ship.
You will have to "equalize" your servos for proper setup, which means you'll have to adjust for all servos to have (almost) exactly the same travel, center position etc. Also, the servos should be of the same speed (even servos of one type may differ).
Otherwise, if you apply collective and the servos all take their own time to get to their desired position (which is maybe not even roughly the same) the heli will also get an unintended cyclic input and move anywhere but straight up. Or if you move from back cyclic to forward cyclic there may be an unintended amount of up or down collective involved, or some left/right cyclic ... you'll see.
When applying small or slow stick inputs, you may not even notice it, but when applying all-the-way inputs, you can even see it watching your swashplate.
Born to fly. Forced to work. |