# Doing a project for college for a manned drone theortically only

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 want people to help you, could you invest some seconds to fix your text (or at least the typos?) May 11, 2018 at 13:48
• Yes sure. Please tell. May 11, 2018 at 15:10
• What should I tell you? May 11, 2018 at 15:16
• For safety you better have all motors running at all times, otherwise failure detection + engagement time delay may result in uncontrollable flight. This means you have to optimize for 500kg thrust with 8 motors. Also, the thrust to weight of 2 is more than necessary for an emergency landing, but I’ll live with that as this is a theoretical study. May 11, 2018 at 19:06
• Hi Cetin, All the motors will be running all the time. When all are running each motor thrust is only 125/2=62.5Kg. But if one motor on one corner fails the other one should be able to produce 125kg thrust(compensation), so il be taking motor which is capable to do that. May 12, 2018 at 4:17