Hi, Uffe! - is that Danish or Swedish?
Your problem might be that the setting of the throttle-function is not correct. Seems to be the controller. You should try to reset the controller and then try to adapt it to you ROYAL SX by running through the programming-routine of your controller. You have to check the controller manual for the correct procedure.
The cause of your problem can be that MULTIPLEX has a slightly different maximum throw rate (+/-0.55 ms unlike e.g. Futaba with +/-0.50 ms).That normally is no problem but you have to adjust the trow-rate.
Good luck!
with regars
profimc
with regards
profimc