For arguments sake lets say a 20mm fan in a model weighing 40g.
You will need 20g thrust or better....... is this possible?
You will need a total intake area of 315 sq. mm.
You will need an exhaust of about 17mm diameter.
You will need a properly designed duct.
You do not want a sharp intake lip
You will have to redesign the wing spar not to get in the way of the duct.
Can the above fit into your design????
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