Nah, that's nuttin'! We used to do that with our Hot Wheels cars all the time when we were kids. Was great fun to take our best roling 5 or 6 cars and send them down the track and through the loop at the same time, nose to tail.
A low bottom to a loop is like one I saw in a video on line several years ago of an F-86 dragging the tail pipe while mushing at the bottom of a loop. It happened over grass, and kinda bumped the tail end of the airplane back up in the air and he continued on and finished his routine, but I bet the cockpit and his flight suit needed some serious cleaning afterwards!
Type at you later,
Dan McEntee