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  1. #1
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    Solas Scorpion prop test

    Ran a Solas Scorpion 28 with interesting results.

    I heard this prop has been a favorite for ski racers but have had to date no experience with it. Some have said it is very similar to a Yamaha T1 which has been a good overall runner when tweaked on my set-up.

    Prop has 15-1/8" dia. blades, straight large barrel, a lot of rake with extra tip cupping for hard bite and high engine height running out of the box. It was stamped a 28 pitch and I did not have the time yet to get it checked for the exact pitch but its safe to say it ran more like a strong 30.

    I had to drill in three 5/8" PVS holes as the pilot holes stock was not enough for acceptable hole shot.

    Prop had excellent weight carry lift, bit hard and never let loose. I could raise motor until water pressure was too low using a coned lower and it still was biting hard. (long ears and deep tip cup working good here.)

    Weather was hot, 88 degrees, light wind and approx. 1' chop. (not the calmest to test in and keep the pedal down, but I'm running a 21' w/21 degree deep vee original Challenger and it handles it well enough.)

    1. Full load, 3 adults (520+lbs., anchor, fire extinguisher, bag of extra everything, extra prop, back seat (90-100lbs), stereo, 28 gal. of gas, full oil tank (2+ galleons). 5500 rpm @ 80-80.5 mph gps.

    2. 1 person aboard, same load less 10 gal gas, 5600 @ 83.4 gps.

    Slip # was a crazy low 1.71% for a 28 ! runs more like a 30.6 pitch if I do some math corrections.

    My motor makes best power in the 6200 rpm range so it looks like I need to go down to like a 26 in this heat.

    Note: It seems a good 2-3 pitch lower then normal might be a good place to start to try this prop.

    Anyone else have any experience with one of there props ?
    Last edited by dnelson964; 07-13-2015 at 07:13 AM.
    1990 22' Activator Yami HPDI 300-sold-86.4
    1976 21' Challenger 2002 3.1 Yami 250 Vmax phase lll 89.7-sold
    1982 21' Superboat 300merc-87
    1990 22' Activator yami OX66 Vmax 250-84.2
    1982 30' Scarab-twin 200 Merc-sold
    1979 21' Challenger 300 Evenrude-sold
    1979 21' Superboat 200 Merc-sold-72

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  3. #2
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    15 1/8" diameter? Wow, that thing must really lift. That slip number is mind boggling.

  4. #3
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    Great report. Thanks.

    I've been eye balling those too.
    I'd rather be competitive w/junk I built in my garage than win w/stuff I bought.


    I refuse to allow common sense to interfere w/my boat buying decisions.


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  5. #4
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    Quote Originally Posted by Greg G View Post
    15 1/8" diameter? Wow, that thing must really lift. That slip number is mind boggling.
    The diameter and cup no doubt added to lower slip numbers, maybe more then I figured on and made it harder to turn up top for sure.




    Instigator Screaming And Flying!


    <dl class="userstats"><dt>Join Date</dt><dd>Apr 2001</dd><dt>Location</dt><dd>Cincy Ohio</dd><dt>Posts</dt><dd>14,987</dd><dd class="collapse" style="font-weight:bold; clear:both;">Post Thanks / Like </dd><dd>
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    Great report. Thanks.

    I've been eye balling those too.


    You are welcome. I had also found very little reviews on this prop so thought I would share my recent experience.
    1990 22' Activator Yami HPDI 300-sold-86.4
    1976 21' Challenger 2002 3.1 Yami 250 Vmax phase lll 89.7-sold
    1982 21' Superboat 300merc-87
    1990 22' Activator yami OX66 Vmax 250-84.2
    1982 30' Scarab-twin 200 Merc-sold
    1979 21' Challenger 300 Evenrude-sold
    1979 21' Superboat 200 Merc-sold-72

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    Quote Originally Posted by Greg G View Post
    15 1/8" diameter? Wow, that thing must really lift. That slip number is mind boggling.
    The diameter and cup no doubt added to lower slip numbers, maybe more then I figured on and made it harder to turn up top for sure. Prop had good lift and ran relatively straight which was good also.

    Instigator
    Screaming And Flying!


    <dl class="userstats"><dt>Join Date</dt><dd>Apr 2001</dd><dt>Location</dt><dd>Cincy Ohio</dd><dt>Posts</dt><dd>14,987</dd><dd class="collapse" style="font-weight:bold; clear:both;">Post Thanks / Like </dd><dd>
    </dd></dl>

    Great report. Thanks.

    I've been eye balling those too.


    You are welcome. I had also found very little reviews on this prop so thought I would share my recent experience.
    1990 22' Activator Yami HPDI 300-sold-86.4
    1976 21' Challenger 2002 3.1 Yami 250 Vmax phase lll 89.7-sold
    1982 21' Superboat 300merc-87
    1990 22' Activator yami OX66 Vmax 250-84.2
    1982 30' Scarab-twin 200 Merc-sold
    1979 21' Challenger 300 Evenrude-sold
    1979 21' Superboat 200 Merc-sold-72

  7. #6
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    Sounds a lot like Mercury's Rev 4. Have you tried one of them Doc?

  8. #7
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    Quote Originally Posted by vnemous View Post
    Sounds a lot like Mercury's Rev 4. Have you tried one of them Doc?
    The Rev4 is exactly what I thought as well when I read the description but the Rev4 does not like to be truly surfaced.

  9. #8
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    Quote Originally Posted by vnemous View Post
    Sounds a lot like Mercury's Rev 4. Have you tried one of them Doc?
    I have not Mike. I guess they run stiff also ?

    I also tested it against a Turbo TXP 27 but that had less success in the handling and lift department so I didn't even try to run it out.
    Last edited by dnelson964; 07-13-2015 at 11:48 AM.
    1990 22' Activator Yami HPDI 300-sold-86.4
    1976 21' Challenger 2002 3.1 Yami 250 Vmax phase lll 89.7-sold
    1982 21' Superboat 300merc-87
    1990 22' Activator yami OX66 Vmax 250-84.2
    1982 30' Scarab-twin 200 Merc-sold
    1979 21' Challenger 300 Evenrude-sold
    1979 21' Superboat 200 Merc-sold-72

  10. #9
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    yes they do but the bite is unreal.

  11. #10
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    There was a thread over on the Checkmate-boat form on the Scorpion prop. Someone had tried one on a 21' Pulsare and said it was amazing. I tried one and was not that impressed. As mentioned it needs much larger vent holes to spin up for hole shot and they are very stiff in pitch. Maybe if I had tried 1-2" pitch smaller prop and had 6 PVS holes drilled my results would have been better.

    Vnemous mentioned the Rev4. I use one and it is one of my best props. Unfortunately I think the max pitch made is a 25". I run a Croxton B&B 23" Rev4 with 8 PVS holes. My slip is about 5% and I surface it all the time. It runs similar RPMs to a 24-25" Bravo. I tried a stock Rev 4 and it would not spin up for hole shot with only 4 PVS holes.

  12. #11
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    Yes I tried a 21p rev4 on my 20 key largo with my 285hp 250 efi. Very hard to get out of the hole with four plugs out but once on plane it accelerated like no tomorrow and ran the boat to 70 very quickly. Would love to try one on my superboat but obviously need more pitch. Like said they only go to 25 pitch but I bet a competent shop could pitch it to 27

  13. #12
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    Update:

    Since this scorpion handled so well I am going to let my propman cut and work it to see if we can't make it a better runner !
    1990 22' Activator Yami HPDI 300-sold-86.4
    1976 21' Challenger 2002 3.1 Yami 250 Vmax phase lll 89.7-sold
    1982 21' Superboat 300merc-87
    1990 22' Activator yami OX66 Vmax 250-84.2
    1982 30' Scarab-twin 200 Merc-sold
    1979 21' Challenger 300 Evenrude-sold
    1979 21' Superboat 200 Merc-sold-72

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  15. #13
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    looking forward to your results,this also has been my best prop for a challenger to date. 85 with 12 inches of setback ive tried txp's vmx's trophys,tempest's,lasers, u name it

  16. #14
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    Quote Originally Posted by dnelson964 View Post
    Update:Since this Solas scorpion prop handled so well I am going to let my propman cut and work it to see if we can't make it a better runner !
    Should be interesting. Did you ever run a Merc Rev4 on your Challenger 21 to compare?

  17. #15
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    Quote Originally Posted by endabran View Post
    looking forward to your results,this also has been my best prop for a challenger to date. 85 with 12 inches of setback ive tried txp's vmx's trophys,tempest's,lasers, u name it
    When you say Challenger, do you mean the same Challenger 21 OB that dnelson964 has?

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