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  1. #1
    ptscon's Avatar
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    Question Solas 15/22 better holeshot than 15/20 ?

    So first half of this season I was running a Solas 15/22 with trailing edge pitched, then I switched to 15/20 again with trailing edge custom pitched.

    Holeshot when I was running 15/22 was superb, it just ripped off of the line like a monster. With trim up and sitting up front leaning over the handle bars the ski would literally jump out of the water if I launched like that (fun tests).

    Then I switched to 15/20 and it was never like that again.

    I looked at some old logs and a current one, at 1 sec mark from full throttle when I was running 15/22 the ski would be at 16 km/h ..with 15/19 it's only at 13 km/h. It felt a lot faster at launch with the 15/22.

    Now, the old log from 15/22 was with intake temperature 10F lower ..but it was running plastic wear ring, old bellows and misaligned engine. 15/19 log is with ss wear ring, new bellows and motor aligned. They both cavitated off the line though, hitting my 9k limiter.


    Makes me wonder if 15/22 has a better holeshot, does it?


  2. #2
    JT jpt7779's Avatar
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    You answered your own question in your post!

    Yes, the 15/22 will have a better hole shot and acceleration, but most likely will be a few mph slower on top compared to the 15/20. If you are not chasing a top speed, stick with your trusty old 15/22.

  3. #3
    ptscon's Avatar
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    Hmmm interesting, might go back to 15/22 for next season ..that thing launched like a bat out of hell compared to 15/20.

    Is it the difference in root angle that causes this since they both have the same leading pitch? Wondering if depitching the leading edge of the 15/20 would bring it closer to the 15/22 holeshot.

  4. #4
    Site Admin Green Hulk's Avatar
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    Quote Originally Posted by ptscon View Post
    Hmmm interesting, might go back to 15/22 for next season ..that thing launched like a bat out of hell compared to 15/20.

    Is it the difference in root angle that causes this since they both have the same leading pitch? Wondering if depitching the leading edge of the 15/20 would bring it closer to the 15/22 holeshot.
    the 15/20 and 15/22 actually have the same root angle. (where the blade meets the hub)
    They are the same casting.

    The only difference is 2 degrees more trailing edge pitch on the 15/22

  5. #5
    ptscon's Avatar
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    Quote Originally Posted by Green Hulk View Post
    Quote Originally Posted by ptscon View Post
    Hmmm interesting, might go back to 15/22 for next season ..that thing launched like a bat out of hell compared to 15/20.

    Is it the difference in root angle that causes this since they both have the same leading pitch? Wondering if depitching the leading edge of the 15/20 would bring it closer to the 15/22 holeshot.
    the 15/20 and 15/22 actually have the same root angle. (where the blade meets the hub)
    They are the same casting.

    The only difference is 2 degrees more trailing edge pitch on the 15/22

    Oh really? I thought 15/19 and 15/20 were the same but 15/22 used a different casting.

  6. #6
    Site Admin Green Hulk's Avatar
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    Quote Originally Posted by ptscon View Post
    Oh really? I thought 15/19 and 15/20 were the same but 15/22 used a different casting.
    I just verified with Solas that the 15/19, 15/20 and 15/22 impellers are all the same exact casting. The only thing different is the trailing edge pitch.

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  8. #7
    ptscon's Avatar
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    Quote Originally Posted by Green Hulk View Post
    Quote Originally Posted by ptscon View Post
    Oh really? I thought 15/19 and 15/20 were the same but 15/22 used a different casting.
    I just verified with Solas that the 15/19, 15/20 and 15/22 impellers are all the same exact casting. The only thing different is the trailing edge pitch.


    Ah it's a mystery than why it felt so better off the line. Running faster up top now with the depitched 15/20 than before with depitched 15/22.

    The "SRZ 15/22R" I had was an early model where they machined SRX to SRZ but it was still stamped SRX on the outside and had SRZ scratched on the inside. I wonder if the machining did something to it that improved the holeshot.

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