Question

calculate battery capacity of quadcopter to reach hieght

Answer 1

The drone will operate autonomously in the high-altitude flight. Using GPS it rises vertically above the starting position as far as possible upwards until the battery is almost empty. This is followed by a controlled swoop in which the rotors are slowed down accordingly to a stable flight attitude. This works only with motors with low cogging torque. Energy recovery is possible. Shortly before the ground the model is intercepted and landed safely.