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  1. #1
    RNX's Avatar
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    going from 4 blade to 3 blade

    Hi, I have pitched 4 blade 15/20 to 15/22.5 and spinning it right @ 8100 RPM, what pitch 3 blade should i buy? Thank you!


  2. #2
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    Quote Originally Posted by RNX View Post
    Hi, I have pitched 4 blade 15/20 to 15/22.5 and spinning it right @ 8100 RPM, what pitch 3 blade should i buy? Thank you!
    What mods are you running? I'd suggest starting with a 15/19 and tweeking from there

  3. #3
    RNX's Avatar
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    My setup is Stock ECU with b-kit charger, xs ic, rear air, riva waterbox. I was thinking about 15/19R also, maybe it will be perfect for running 8100rpm?

  4. #4
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    Quote Originally Posted by RNX View Post
    My setup is Stock ECU with b-kit charger, xs ic, rear air, riva waterbox. I was thinking about 15/19R also, maybe it will be perfect for running 8100rpm?
    Should be close..Alittle tweeking is no big deal

  5. #5
    I think a you may need more than a 15/19R.......I have a customers RXP running a Stage 3 SC, stock intercooler (riva Gen 1 sprung a leak), stock thermo, stock ECU pulling a 15/19 3 blade 8100 all day long 76.8 mph with 83mm ring in 90 degree heat and full of gas

  6. #6
    RNX's Avatar
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    + my thermo is riva, not stock. So i think i need much more than 15/19

  7. #7
    Dave Sharp dav_dman's Avatar
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    speedfreeks setback mod on your 4 blade might give you the accel you want. I dont know personally but i've heard good stuff.

  8. #8

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    I have the x boat and with a 3 blade set back prop and pump mods ( as well as all the good stage one stuff) I was running a 15.5/22.5 on stock x charger. It was a tad too steep after adding the kick onto the 15.5/22.5 on a 84.5 nozzle.

    I was running 74.3 at 8100 rpms.

    I now have the B-kit with les cooke remap and that same prop in a tad bit hotter weather spun like mad out of the hole. We're going to go 16.5 on the leading edge, keep the kick on the trailing edge and go from there.

    Not sure on nozzle size yet... while testing I was using a 84 mm.. see sig for results...

    I've had the 4 blade in my ski both before and after the B-kit and I hated it due to lack of hook up in any chop. My 3 blade after the B-kit spun like the 4 blade but it hooked up like nothing else. I was jamming full speed through 1-2' chop no problem..... and even with the spin the hole shot and accell. was unreal.

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