Weight of the Drone in total will be 240 Kg.
It Will be a quad copter drone setup but with 8 rotors(two on each corner) for redundancy purpose. Aim is achieve Thrust/weight ratio of 2. So need total needed thrust will be 500 KG. Considering 500 kg thrust by 4 rotors only(because the 2nd rotor on each corner if fails the 1st motor should be able to compensate thrust) , each should be able to produce 125 kg thrust. The propeller Diameter will be 1.2 m ( Total 8 propeller) Now coming to the question: What should be the power rating of the motor if i want 125 kg thrust from each Propeller (When running at 85%-95% of the max RPM.)
If you have any Doubts or any details please ask ,will reply as soon as possible.