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  1. #1
    Site Admin Green Hulk's Avatar
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    3 blade vs. 4 blade impellers

    Are higher speeds achievable with 3 blades vs. 4 blades?


  2. #2
    Moderator Insanediego Joe's Avatar
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    I think everyone that is running fast is using 3 blades. I just cant see that 4th blade bringing much to top end performance. I bet a 4 bladed prop is great for holeshot and acceleration. My 2 cents is to stick with 3

  3. #3
    Site Admin Green Hulk's Avatar
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    I have to change out my driveshaft to run a 3 blade skat, but it may be worthwhile

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    Moderator Insanediego Joe's Avatar
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    There is only one way to find out. You can bet the bank the fercho is running 3 blades on his 80 mph ski!

  5. #5
    Pistonwash's Avatar
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    The 4 blade was designed to be quieter (believe it or not) and to help the pump more more effecient with lower rpm machines. They will kill top-end speed because of the blade surface area inside the pump. You want less blade spinning in there for top-end speeds. Thats why a Swirl prop is slower than a R-cut prop from Skat Trak. There is a happy medium depending on what you are trying to do.

    There has'nt been a faster prop design made, only less surface area engaged in the pump. Just like some skis will run better on a Nu-jet prop because the blade surface is smaller to allow more water to be process at higher rpm's. I hope that makes sense.

    Just like an 800 grate reduces incoming force of water into the pump area at higher rpm's, and it translates into top-end gains. There is a balance to be found but you can go to one side of the spectrum for all out top-end set-up, but lose your bottom end. Just like trading off handling for speed..same thing.

    3 blades are the best to date for what we are trying to do.

    I wish we had a prop that would "morph" from a big leading edge (grabbing water) into a small trailing edge (letting more water through) when going to higher rpm's, sort of like a F-15 jet.

  6. #6
    Site Admin Green Hulk's Avatar
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    ..... think i may try a 3 blade

  7. #7
    Happily Self-Employed WFO's Avatar
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    What is the pump diameter on an RXP?

  8. #8
    Site Admin Green Hulk's Avatar
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    I think its 158mm

  9. #9
    Hydrotoys's Avatar
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    Jerry,
    Are there not anyone that has already tried the 3 blade on the RXP?

  10. #10
    Site Admin Green Hulk's Avatar
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    Not any that i know of. You have to buy the Rotax Racing two piece coupled driveshaft ($1900) to be able to run the 3 blade.

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