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Again, its all in the question. two scenarios for a ducted prop in hover:

  1. inlet guide vanes close to the prop to control the angle of attack
  2. just a prop with a variable pitch mechanism.

obviously, the first option is mechanically simpler, as we are not dealing with a rotating component. so my question is more specifically about the aerodynamic side of things. how accurate/responsive are guide vanes at controlling AoA? how draggy are they?

thx in advance!

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