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Thread: Larger diameter prop goods and bads

  1. #1
    Member rrjfish8's Avatar
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    Default Larger diameter prop goods and bads

    I orderd a stainless prop with a diameter of 11.1x13 and it came as 11.5x13. the prop I am replaceing is a 11.1x14 stainless and the new prop also looks to have a blade 1/4 to 1/3 thinner then the older prop. I am looking to increase the wot rpm about 200. Is the .4 in diameter going to make much difference? There are a lot of variables it this question but thought I would ask. Thanks Ryan

  2. #2

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    General rule is each 1/4" in diameter equals 100 rpm, also each inch in pitch equals 200 rpm. But a thinner prop should rev higher, cup or no cup is good for 200 rpm increase. Every manufacturer builds their prop different from the others that is why you got a different size probably.

  3. #3

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    Quote Originally Posted by DaleC View Post
    General rule is each 1/4" in diameter equals 100 rpm, also each inch in pitch equals 200 rpm. But a thinner prop should rev higher, cup or no cup is good for 200 rpm increase. Every manufacturer builds their prop different from the others that is why you got a different size probably.
    Good rules of thumb to remember. Thanks!

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