- If your 'speed' control is at anything other than 'zero' when you switch on, you will not get movement until the speed control has been zeroed for (at least) one second).
- If this is a v.3 Cobra, then it also has inertia.. This is set before you set speed-curves, and can be set to a l-o-n-g time-value. - Check inertia is set to lowest setting.
- Double-check you have the BEC / control lead connected to the correct channels of your receiver.
But you have probably done all this?