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Old 14-01-2020, 04:31 PM   #1
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Scorpion rib jack plate install

Hi guys, I’m the process of getting a jack plate for my scorpion 7.5. not sure what setback to go for. Is there anyone running a jack plate on a scorpion or a rib that could help? Engines a 20” 225 Honda with a bobs nose cone. Thanks
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Old 14-01-2020, 06:06 PM   #2
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Here some good infos=http://www.boatmad.com/forum/f5/outboard-height-pic-requests-24901.html

I've installed a 6 inches jack plate on a Solent 750/300 vmax a couple of years ago, and put the engine at down position ventilation plate Vmax 8cm above the hull bottom, the engine was centered on the transom. for an overall use, this is good.
be careful if you're using a front steering to allow enough space for tilting the engine inside, sometime using a jack plate and front steering it can be necessary to increase the space above the transom. See last picture.
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Old 14-01-2020, 10:40 PM   #3
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Thanks for the info, what speed gains did you see from the jack plate?
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Old 15-01-2020, 01:56 PM   #4
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Country: FRANCE
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The speed gain was around 2 mph light boat condition, but the boat balance was seriously improved.
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Old 19-01-2020, 10:16 AM   #5
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Country: england
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I have a cnc 5.5” setback. Initially used it to clear transom height and to gain some low down bite from prop. Mine is 8.1 stepped hull and with motor direct on transom it slipped a lot when trying to plane. Scorpion have now built setback into some of their stepped hull transoms. Probably around 12”

No idea of speed gains with mine as I changed several things at once. . My prop shaft is almost dead level with bottom of hull.

Something to think about with the jack-plate, is your steering hoses. I can only tilt around 75% now due to the hose joints touching top of transom. If I had double the set back I would clear transom, but that’s quite a change in c of g.
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Old 19-01-2020, 10:25 AM   #6
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Country: england
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Boat make: scorpion 8.1
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See scorpions built in setback in white.

Mine is evinrude
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