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Title:How ducting a propeller increases efficiency and thrust
Duration:18:18
Viewed:1,220,941
Published:22-07-2015
Source:Youtube

By placing a propeller in a duct, the efficiency and maximum thrust can be increased, sometimes significantly. This video explains two of the mechanisms by which these improvements are obtained -- namely by reducing the losses due to the tip vortex which occurs when a propeller operates in free space and also by using an annular wing that harnesses the effects documented in Bernoulli's theorum.

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