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  1. #1
    Branden's Avatar
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    Can someone explain how this happens

    I went out riding today and i was just cruising for the most part with a buddy of mine, and on the way back to the ramp we played around a little, the first pull felt good and stong, the last pull we did i felt a strange vibration at ~8000+ rpm and immediately shut it down as i thought the flywheel bolts were letting go. i just cruised on back to the boat ramp and everything felt ok at 40 mph or so. Curiosity got the better of me so i yanked the pump out and my prop was REALLY hard to turn by hand, so i took it out to find this:





    I managed to bust 2 out of the 4 blades. Im guessing at some point today i sucked something up and wounded the prop, and the last pull finished it off?


  2. #2
    Sanfish's Avatar
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    That sux.

    Something got stuck between the trailing edge of the prop and the pump vanes.

    Is that a untouched prop or been tweaked? My reason for asking is if too much trailing edge, it can compromise a sand cast prop as these are.

  3. #3
    Branden's Avatar
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    I have pitched this prop quite a bit, it's a 15/19 and I have pitched it to a 14/23 I was thinking something got between the prop or I weakend the prop by pitching it too much. The wear ring is destroyed

  4. #4
    AtoMIC_OraNGE greenbullet's Avatar
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    NICE! your lucky that blade didnt let go.... i had a 14/19 that was pitched alot.. back when.. it got weak and youd pitch it run it a few times and realize your rpm has changed... check the blade and it bent back.... the more you bend the weaker it gets IMO.. your lucky...

    this is why i recommended a strong prop... i still think your over spinning that 14/19 or whatever blade that is past its capability... you need a 15/20 or 22 and pitch from there

  5. #5
    Mod less, ride more! troyheb's Avatar
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    Cheap ass castings.

  6. #6
    Banned User
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    It has been seen before with Solas props.

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  8. #7
    Sanfish's Avatar
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    Unless things have changed:

    Solas = sand casting
    Skat-Trak = investment casting

    I've tweaked many Skat-Trak props over the years and have never seen a failure (even though they are thinner).

    I'm not saying to buy Skat, just be aware if a sand cast part is repeatedly adjusted, it will compromise the structure. Add to this an object getting stuck in pump hitting the blade and you have a recipe for failure.

  9. #8
    Branden's Avatar
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  10. #9
    Nothin' better than Doo'in it! BigDaddyRXP's Avatar
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    From the marks on it... it looks like it was pitched - bent way to close to the hub.

  11. #10
    Tiny's Avatar
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    My guess is that from the marks on the blade, you bent just the back edge and not the whole blade???

    I have seen this many of times with Yamaha props in the race skis....

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