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These are carbon fiber propellers 40"long at the end of each arm

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Propellers' free stream into the blades is like a flared-out cone. but the output near the backside of the blades is concentrated and cylindrical.

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proppeller flow

That's one reason big drones use multiple propellers, so they don't take away from the in-flow of each other.

The lift rideshare is planning to introduce autonomous rideshare drones. They have tested the prototype and have received FAA approval to test fly it. As can be seen, the propellers are kept at a distance from each other.

Lift Hexa Airplane

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  • $\begingroup$ Nice lesson. However, I think the OP is asking for the setup of multiple propellers on the same hub. $\endgroup$
    – r13
    Sep 17 at 19:03
  • $\begingroup$ The NASA picture ignores the tangential (whirl) velocity in the prop output, which has no effect on the thrust but will definitely interfere with the airflow pattern if two props are close together. $\endgroup$
    – alephzero
    Sep 18 at 13:11

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