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can ducted propeller produce twice lift compared to opened propeller ? Answered

can ducted propeller produce twice lift compared to opened propeller ? for example if there is an opened propeller with low rpm producing some amount of lift. If we ducted that opened propeller and provide same rpm and power as opened propeller to it will it produce twice lift compared to opened propeller with same rpm and power ?

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This is your second question that sounds like homework, I feel you should give us some background behind what your trying to do.

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