this post was submitted on 28 Mar 2025
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I don't think the number of blades is really important. After all if you just keep adding blades eventually you would get to a point of diminishing returns. That's around four blades which is why most only have four blades, unless they're made out of incredibly light material.
So if you have a lot of extra blades there probably is some additional engineering going on to make use of those extra blades in some way.
I was meaning that the blade count and detachability was the difference in definition between turboprop and propfan/open turbofan, not that it was necessarily the thing making the engine more efficient.