A roll is a rotation about the longitudinal axis of MA. To keep the momentum, for a horizontal roll the longitudinal axis must maintain its angle to a horizontal plane. Start and end of rolls should be crisp and well defined.
The Model Helicopter hovers or moves slowly and is rotated using cyclic pitch about 135°. It then rotates its RD in a 90° arc back and forth. A movement of the centre of gravity of less than 2 m for simple tic-tocs or less than 5 m for tic-tocs with pirouettes.
A rainbow is a semicircle, starting from hovering, with RD always normal to the flight path. The diameter of the semicircle should not be less than 10 m. The start and stop shall be crisp and well defined.
While in fast flight the Model Helicopter follows a wavy line by alternately performing upright and inverted quarter circular segments of equal diameter and length.
During these circular segments the banking must not fall below 45°. A banking of less than 20° means just an array of quarter circles but not a snake and makes the maneuver unrecognizable.
A funnel is a circle with at least 10 m diameter, performed with a declination of RD of at least 45° from a horizontal plane. The Model Helicopter speed, declination and circle diameter should be constant. A declination of less than 20° means just a horizontal circle but not a funnel and makes the manoeuvre unrecognizable.
Cyclic or pirouette reversals must be performed in a way, that the number of rotations in each direction is almost equal. If not defined otherwise, the direction of rotation should alter after every 360° rotation.