ORIGINAL: confuzshuz

I have a sport flyers wasp ep trainer. I've been trying to figure out why I can't return to normal flight from inverted flight by doing a "reverse C" maneuver. In other words, from inverted flight, I would apply forward elevator to attempt to return to normal flight.
I have to continue doing a loop or roll out of inverted to return to normal flight.
Is this maneuver impossible or is it just my plane?

thanks in advance