ORIGINAL: Jeff Pfeifer
It is really the same thing as a rolling circle but on it's side! Your timing with the rudder and elevator are just turned 90 degrees from the norm for a rolling circle. Once you get a simple rolling loop down you can start working on a specific amount of rolls in the loop, then alternate directions or throw in snap between rolls or what ever. Once you get the rolling loop down pat then start working on your harrier rolling loops. And you can mix those up as well by alternating rolling direction and different entries and exits. The possibility is endless!
Jeff Pfeifer
Not really, as gravity has an entirely different effect on the plane in a rolling loop. You will find that the control inputs for elev and rudd diminish as you approach the top of the loop, and throttle control will be more necessary to bring it over the apex. On the downside of the loop your control inputs to the tail will increase, exponentially until you bring it back to the starting point. Making a loop while rolling is the easy part...maintaining a constant roll rate throughout the loop is where real skill comes in, so keep practicing!