The top of each blade moves ______.

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Multiple Choice

The top of each blade moves ______.

Explanation:
When a propeller blade spins, every point on the blade traces a circular path around the shaft. At the top of that circular path, the velocity is directed toward the outer side of the boat, or outboard. So the top of each blade moves outboard. The motion is horizontal around the shaft, not vertical, which is why upward or downward aren’t correct directions for this rotation. The inboard direction would be toward the boat’s centerline, which is opposite to what the top of the blade does.

When a propeller blade spins, every point on the blade traces a circular path around the shaft. At the top of that circular path, the velocity is directed toward the outer side of the boat, or outboard. So the top of each blade moves outboard. The motion is horizontal around the shaft, not vertical, which is why upward or downward aren’t correct directions for this rotation. The inboard direction would be toward the boat’s centerline, which is opposite to what the top of the blade does.

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