Unable to get motor to work

i feel silly asking, but i just cannot get the motor to work on my ZOHD dart. i have tried with my Cube Orange, and Purple and a mini pixi can get evrything esle to work just fine. i have several Quadcopters and i have no issues at all. i have ran through the adrupilot insuctions, i know i gota be missing something somewhere. i have a jumper 18 radio and several receivers . i would love some info if someone would like to message me.

Is it armed? ESC calibrated? Any warnings in Mission Planner?