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I like the concept but, can we replace a huge propeller with three or four inline and directionable small propellers for better stability?


You get less thrust that way.


Also worse efficiency, more complexity, more expense, and more things to go wrong.


And, since this is already being steered by a computer-controlled vectored thrust system, giving it more fans won't make it any more stable in the first place. This system is plenty actuated.


More complexity but more redundancy too.




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