I have the Hobbico Superstar trainer has been a pretty good plane, the O.S 40 fires right up flies good, decent radio & servo's, now on to my problem, did my pre-flight everything working great, time to fire it up, spin the prop, hear a vibration shut her down to take a look don't find anything right off start looking a little deeper & lo & behold the top of my firewall had come unglued, a little pro-bond & ca glue all is well, be forewarned about these RTF's, go over all of the frame, it seems like mine was spot glued in a few places.