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Prop wash and wing lift


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The prop slipstream has a large effect on wing lift, especially at low speeds. This is referred to as the "powered lift" portion of the total wing lift. The magnitude of powered lift is typically correlated to "thrust coefficient" (Ct). It all comes down the difference between the free-stream air velocity and the induced air velocity behind the props: the larger the difference (think high power and low speed), the larger the contribution of powered lift. In those conditions, the loss of an engine would cause a rolling tendency toward the dead engine.

To get an idea of the powered lift present on the C-130, compare the normal and max effort takeoff speeds. Normal speeds are based on "power off" stall while the max effort speeds use the "power on" stall speed.

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