What power setting is used by number 1 during an interval takeoff?

During an interval takeoff, the lead aircraft, designated as number 1, uses maximum power to gain the necessary speed and altitude for a safe departure. This maximum throttle setting ensures that the aircraft can achieve optimal performance, maintain a safe interval with the following aircraft, and adhere to the performance standards expected during the takeoff phase in formation flying. Using maximum power is critical to compensate for factors such as weight, configuration, and any environmental conditions that might affect climb performance. The other power settings do not provide the necessary thrust and performance required for a safe and effective interval takeoff, making the maximum throttle setting the appropriate and correct choice in this scenario.