In a propeller, velocity variation from hub to tip is best described as?

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Multiple Choice

In a propeller, velocity variation from hub to tip is best described as?

Explanation:
In a rotating propeller blade, the speed at which a blade element moves through the air increases with its distance from the hub. The tangential velocity is v = ωr, so as you go from the hub (small r) to the tip (large r), the blade’s rotational speed through the air grows. When you include the forward flight speed, the relative wind the blade experiences is smallest near the hub and largest near the tip. So the best description is that velocity is low near the hub and high near the tip. The idea that the root would move faster than the tip contradicts the way rotational speed scales with radius.

In a rotating propeller blade, the speed at which a blade element moves through the air increases with its distance from the hub. The tangential velocity is v = ωr, so as you go from the hub (small r) to the tip (large r), the blade’s rotational speed through the air grows. When you include the forward flight speed, the relative wind the blade experiences is smallest near the hub and largest near the tip. So the best description is that velocity is low near the hub and high near the tip. The idea that the root would move faster than the tip contradicts the way rotational speed scales with radius.

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