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Is each blade on a set of propellers the exact same size and shape?


Yes, on a propeller, every single blade is the exact same size and shape. If the blades were not the same size, the propeller would need more force in order to spin, making it inefficient. All the blades are the exact same shape as well. If there was a blade with a different shape, that blade would experience a different force from the rest of the propeller, which would make the lane unstable.