Pilots of the World War II dive bomber known as the Stuka particularly noted the effects of the dive. Beginning at a height of 4,600 m (15,000 ft), the Stuka would roll 180°, automatically nosing into a dive. The aircraft would then dive at a 60-90° angle, holding a constant speed of 500 to 600 km/h (270 to 320 kn; 310 to 370 mph), until it had gone some 90% of the way to the ground, releasing its bombs at a minimum height of 450 m (1,480 ft).[6] Once the pilot released the bomb and initiated an automatic pull-out mechanism by depressing a knob on the control column, the aircraft automatically began a six g pullout.[6] The tremendous g-forces to which pilots were subjected during this maneuver could lead to momentary blackouts, necessitating the inclusion of mechanisms to automate pullout from the dive while the pilot was unconscious.