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  1. #1
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    Question 3bl and 4bl vs RPM

    The scenario, 2 props one a 3 blade and one a 4 blade. Both props have the same pitch and diameter and through hub. That said what would the RPM drop be going to a 4 blade?
    http://www.stvowners.com

    2003 Cougar 22MTR w/300xs x 3
    90 21Skater w/300xs - sold
    98 STV Euroski w/280 - sold


    2006 Trailblazer SS 6.0l 395hp

  2. #2
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    Yes. Usually 1 size smaller for same rpm as 3 blade. I'm pretty sure of it anyway

  3. #3
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    I don’t think there is a direct comparison. Typically a comparable 4 blade prop will have less diameter than its 3 blade counterpart. The shape of the blades will be different, the design criteria are different.

    It’s like comparing a low-rolling resistance fuel economy tire to a super swamper - but stipulating that both tires be the same size. It’s not a valid comparison...

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