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Old 04-11-2018, 05:28 PM   #2 (permalink)
jeongyun
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Join Date: Mar 2012
Location: Ottawa, ON Canada
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FFE - '17 Ford Focus Electric
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For one thing, ducted or shrouded fans are a lot more efficient than open ones.

Ducted fan - Wikipedia

Quote:
In some cases, a shrouded rotor can be 94% more efficient than an open rotor. The improved performance is mainly because the outward flow is less contracted and thus carries more kinetic energy.[2]
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