Help me with selection of Propulsion system

I need to build a logistic drone with the following requirements:

  1. 25Kg Payload carrying capacity
  2. 60 mins endurance
  3. High altitude flying capability
    Please help me with the selection of motors/props, frame size, Frame type and battery(type and numbers), sensors etc.

Please buy yourself a license of “eCalc Multicopter”. It gives you some good starting points.

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