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  1. #1
    BLACK MAGIC HEADERS hydrojunkie's Avatar
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    prop question stg 2 rxt

    i have a hand full of props. the best seems to be the 14/17 stage 1 prop from riva. bust listen first then put your advise together.

    3 blade 13/17 spins 8180 rpm @ 67 mph
    4 blade 14/17 spins 7800rpm @ 69 to 70 mph
    3 blade 15/18 spins 8180rpm @ 69.1

    stock nozzle and stock venturi.

    what would you do

    here are my mods.
    free flow kit, xs intercooler with dannys new pipes, rotax wheel @ 9 psi rotax thermostat housing, 42 lb injecters, 3inch intake, 3 flow rites 1 up front 2 behind the grab bar. denso plugs, catch can.


  2. #2
    BLACK MAGIC HEADERS hydrojunkie's Avatar
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    any one out there

  3. #3
    Vman's Avatar
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    I would think that you should be able to spin more prop than that. Your 3" intake stands out as a weak link in your mod profile.

  4. #4
    HoopsRXT's Avatar
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    I just put in my 13/19 prop on my RXT. I can only turn it to 7800. I could turn the 14/17 to 8100. I am running similar mods as you.

  5. #5
    shhr's Avatar
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    how is the holeshot between the 2 3 blades if the holeshot is good on the 15/18 then I would send that one to Jerry for a little tweaking to get those R`s to 8100 then sell the other 2 as you will not need them this will give you the best performance

  6. #6
    My friend runs a stage 1 RXT with a rotax wheel, stock injectors and no intercooler. It runs 8160 rpms @ 68-69. I had a 4-blade 14/18.5 that I had Glenn repitch to a 14/17. Are you sure your prop really is a 14/17? Your should be on the limiter with your mods.

  7. #7
    Gotta love this sport! 05Limited's Avatar
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    Quote Originally Posted by Mark S View Post
    My friend runs a stage 1 RXT with a rotax wheel, stock injectors and no intercooler. It runs 8160 rpms @ 68-69. I had a 4-blade 14/18.5 that I had Glenn repitch to a 14/17. Are you sure your prop really is a 14/17? Your should be on the limiter with your mods.
    Annette's ski has this same set-up with a de-pitched 14/18.5 Solas and she just breaks 70mph @ 8100 with 2 bars of fuel (she's also rather skinny).

    hydrojunkie... if you can, measure how many millimeters the trailing edge is from a flat surface...we can compare it to Annette's.

  8. #8
    lugnut's Avatar
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    7960 to 7980 rpm with mods listed below
    4" intake & the blower "exhausting"
    http://www.greenhulk.net/forums/showthread.php?t=29079
    Followed their advise & it produced some positive results
    Last edited by lugnut; 08-12-2007 at 10:30 PM.

  9. #9
    BLACK MAGIC HEADERS hydrojunkie's Avatar
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    Quote Originally Posted by 05Limited View Post
    Annette's ski has this same set-up with a de-pitched 14/18.5 Solas and she just breaks 70mph @ 8100 with 2 bars of fuel (she's also rather skinny).

    hydrojunkie... if you can, measure how many millimeters the trailing edge is from a flat surface...we can compare it to Annette's.

    its a true 14 17 from riva. so i bent it 4mm last night going to try it out today. it was 4 mm from the bottom before i bent it

  10. #10
    Gotta love this sport! 05Limited's Avatar
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    Quote Originally Posted by hydrojunkie View Post
    its a true 14 17 from riva. so i bent it 4mm last night going to try it out today. it was 4 mm from the bottom before i bent it
    Hmmm... I haven't pulled Annette's 14/18.5 yet, but I did just go out and measure a 14/19. The trailing edge was 6mm from the surface of the workbench... sounds like you are going in the right direction.

    I'm curious to hear your results... let us know,

    Jeff

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