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The hammerhead turn, stall turn, or Fieseler is an aerobatics turn-around maneuver. Enter at full power and maximum airspeed. Pull the aircraft up through a quarter loop into a vertical climb. The speed will decay but before upward motion stops firmly apply full rudder to yaw the aircraft through a cartwheel of 180° until the nose is straight down. Dive vertically to the same altitude as the maneuver started, then pull out, exiting in the opposite direction The timing of applying full rudder is critical. If instigated too soon it results in a wingover. If instigated too late the plane will fall into a sideslip or else enter a tailslide which most aircraft are restricted from doing. Performing the pivot requires sufficient airflow over the rudder. In planes with a suitably-positioned propeller, the propwash may provide this. Otherwise, rudder must be applied sooner while the plane still has forward airspeed. This maneuver demands there be no rolling at all but when airflow is minima
