You know what's kinda odd about the safety rules. There're some rules that don't apply if flying indoors, like touching a plane in flight or distance to pilot. But, technically those rules do apply flying outside even when flying a plane that normally would be flown indoors. So if you fly an F3P plane outdoors, you are supposed to follow the same rules as a larger plane. Doesn't really make much sense but there's no way to define an indoor plane flown outdoors.