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Thread: 15/20 or 15/22?

  1. #1
    jdbretz's Avatar
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    15/20 or 15/22?

    I have the mods listed in my signature box, and I was wondering if I would be better off with a 15/20 or 15/22 prop? I have an adjustable nozzle with 81-84mm rings to help dial in the RPM's without repitching, so I would like to get the most out of the prop with the least work. I am not planning on upgrading any further, so I am not concerned with having a prop for future mods. Most of my riding will be in high 80's to mid 90's air temp and mid to upper 70's water temps if that makes a difference. Thanks in advance to the help.

    Justin


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    Site Admin Green Hulk's Avatar
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    Hi Justin, with those mods the 15/20R is the best choice.

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    jdbretz's Avatar
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    Jerry,

    Thats kinda what I was thinking, but thought I would consult the "experts" before I bought one. What ring size do you think would be a good starting point?

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    Eric Ocman's Avatar
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    Re: 15/20 or 15/22?

    definitely 15/20. if you need it tweaked contact duke!



    Sent from my Droid using Tapatalk

  5. #5
    Site Admin Green Hulk's Avatar
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    Quote Originally Posted by jdbretz View Post
    Jerry,

    Thats kinda what I was thinking, but thought I would consult the "experts" before I bought one. What ring size do you think would be a good starting point?
    Most people get the best top speed results with the 81mm ring.

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    Swedish Viking Craigo's Avatar
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    Does anyone know the RPM difference between the 15/20 and the 15/22 at WOT?

  7. #7
    RXP 260 X Short Course Veteran RXP244's Avatar
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    Prop and Ring Size

    I have always used the 82mm ring. As for the prop I certainly would not use anything bigger than the 15/20. It might need a bit of tweeking to get the rpm where you want it. I take it that you are working with the stock ECU.

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