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Thread: Solas Scorpion prop test
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07-13-2015, 07:10 AM #1
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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07-13-2015, 07:29 AM #2Screaming And Flying!
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15 1/8" diameter? Wow, that thing must really lift. That slip number is mind boggling.
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07-13-2015, 07:32 AM #3
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.
Checkmate 16' 140 Johnson
Hydrostream 17' Vector FrankenRude I
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24' Sonic w/twin 250 Johnsons
24' Sonic w/twin 250 HO Johnsons
19' STV River Rocket w/FrankenRude II
Allison XR 2002 w/Frankenrude II
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07-13-2015, 08:25 AM #4
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!
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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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07-13-2015, 08:32 AM #5
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!
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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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07-13-2015, 09:08 AM #6
Sounds a lot like Mercury's Rev 4. Have you tried one of them Doc?
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07-13-2015, 10:02 AM #7Screaming And Flying!
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07-13-2015, 10:17 AM #8
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
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07-13-2015, 10:23 AM #9
yes they do but the bite is unreal.
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07-13-2015, 02:35 PM #105000 RPM
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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.
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07-13-2015, 02:50 PM #11
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
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07-18-2015, 08:25 AM #12
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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07-24-2015, 06:10 AM #135000 RPM
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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
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07-24-2015, 06:32 AM #14Screaming And Flying!
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07-24-2015, 06:34 AM #15Screaming And Flying!
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