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bigboat28

08-29-2013 06:57 AM

Speedmaster prop question

Which prop would I get more rpm out of: a 15 3/8 X 26 4 blade 6" hub or a 16.5 X 27 3 blade also 6" hub? Typically how much does each inch of diameter and each degree of pitch change the rpm?

MILD THUNDER

08-29-2013 05:35 PM

You should get more RPM out of the 15 3/8x26. Each 1'' of diameter, or 1'' of pitch, or extra blade is around 150-200rpm. Since that 16.5x27 is 1'' more pitch, 1'' more diameter, but 1 less blade, i'd say the rpm should be within 150-200 of each other.

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