Final answer:
The pre-condition of takeoff in early aviation involved understanding how to control the aircraft. The Wright brothers conducted experiments with kites and gliders to develop controllable airplane designs using techniques like wing warping.
Step-by-step explanation:
The pre-condition of takeoff in the context of flight refers to the necessary factors or requirements that need to be met before an aircraft can successfully take off. In the early days of aviation, the pre-condition of takeoff for the Wright brothers involved understanding how to control the aircraft. They conducted experiments with kites and gliders to develop controllable airplane designs, including the technique of wing warping to control the aircraft's movement.
This understanding of control was considered a crucial pre-condition, as they believed that other primary issues like having sufficiently powerful engines and shaping the wings for lift had already been solved. By focusing on control, they were able to develop and refine their aircraft designs before achieving successful powered flights.