You should set your radio to shut the engine off, up trim to keep it idling, down trim for shut off. With Futaba radios two flips of the training switch should roll the carb barrel back enough so the engine won't run ( cuts the air supply off), that's the Futaba engine kill feature.

Electric is a fun way to fly but you can't compare electric to gas yet, it's coming along, but gas still rules for torque and for pulling heavier planes !!!!

David