With three blades the angular momentum stays constant because when one blade. Turbines with one or two blades are actually even more efficient.

Why Do Wind Turbines Usually Have 3 Blades By Rosemary Barnes Medium
But two-bladed turbines will wobble when they turn to face the wind.

Why 3 blades are common in wind turbines. One Or Two Blades. And engineers have found that three blades is the most efficient and least troublesome way to harvest wind. Single-blade turbines have no stability.
While two and three blade turbines are the most common its important to understand why three. This is because their angular momentum in the vertical axis changes depending on whether the blades are vertical or horizontal. Having fewer blades reduces drag but a two blade design results in wobble when motors turn the nacelle to face the wind yaw.

Why Do Wind Turbines Usually Have 3 Blades By Rosemary Barnes Medium

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Why Do Wind Turbines Usually Have 3 Blades By Rosemary Barnes Medium

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