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Having more than 2 blades on this is less efficient but also quieter–some have as many as 10

Below you may find the Having more than 2 blades on this is less efficient but also quieter–some have as many as 10 which is part of the Jeopardy Archive. In case the question or answer is wrong or something is missing do not hesitate to contact us and we will be glad to help you out. This question was last seen on May 10 2021 Jeopardy! TV Game Show.

QUESTION: Having more than 2 blades on this is less efficient but also quieter–some have as many as 10
ANSWER: PROPELLER

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