The tailslide is an aerobatic maneuver that starts from level flight with a 1⁄4 loop up into a straight vertical climb (at full power) until the aircraft loses momentum.
A 1⁄4 loop (push or pull) recovers to level flight.
Tailslides will transiently reverse the airflow on many aircraft surfaces, giving abnormal forces compared with forward flight.
The control surface linkages must be able to handle these forces without damage or deformation.
The bell is a variation of the tailslide maneuver, with the only difference being that the pilot performs a roll in the longitudinal axis during the final 1/4 loop (push or pull) while recovering to level flight, out of plane.