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How to maintain the same rpm at different altitude?

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How to maintain the same rpm at different altitude?

Old 27th Aug 2019, 15:57
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How to maintain the same rpm at different altitude?

I am studying the FAA handbook and that under the topic fixed-pitch propeller, it says "
  • As altitude increases, the throttle must be opened further to indicate the same rpm as at a lower altitude"
Why is that? Isn't it when density decreases, lower power is needed to maintain the same rpm?
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Old 27th Aug 2019, 19:57
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The lower density also results in less air available for combustion in the engine. This effect is larger than the reduced drag on the prop.
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