The Barrel Roll strategy is a 3D strategy, operating in the wind frame, in which the aircraft performs a barrel roll. The Helix Angle defines the number of degrees that the aircraft travels around the velocity vector, and the Torsion Angle defines the angle of the turn from the aircraft's velocity vector; for example, a value of zero creates a loop, while a value of ninety creates an aileron roll.
You can define the Load Factor on the aircraft at the top and bottom of the loop.
Select the Hold Initial TAS True Airspeed: the speed that the aircraft is moving relative to the airmass that it is flying in. check box to force the aircraft to maintain its true airspeed at the beginning of the procedure throughout the maneuver; otherwise, select an airspeed reference and enter the airspeed for the aircraft at the top and bottom of the loop.