This video shows my first loops and rolls with the DJI Naza F450 Quad. I did at least one in every direction (left, right, forwards and backwards). The entire flight was flown via FPV which I found much easier for these moves. Flying line of sight at this height and distance makes it hard to maintain orientation.
A guy that started flying the F450 about the same time as me told me how he tried to roll it, it got half way and dived into the ground. Broke an arm or two and some props. Thanks to the well thought out F450 frame, he was back up and running in no time but after hearing such a tale I was a bit apprehensive to try it myself….. until now. With my FPV gear up and running it's much easier to gain a lot of height and maintain orientation.
The setup is a stock F450 quad with 8" props and 4S battery (4000mAh on this flight). Other than the gain settings as described here (http://fangin.com/blog/2012/08/07/dji-naza-f450-gain-settings-flips-and-rolls/), there's not much to it. Gain plenty of height and bang the stick over. I can see how if the gains were set too low, the roll rate might not be quick enough to complete the roll without losing too much height.