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Doel Fins on a 2 Toon Pontoon?

Old 03-23-2019, 02:54 PM
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Default Doel Fins on a 2 Toon Pontoon?

I know I'm dancing on the 'third rail' here by mentioning Doel fins, but I'm wondering if anyone out there has direct experience with Doel fins on a 20-25' 2-toon pontoon boat. Boat in question is a new to me 2008 SunTracker w/ a 90hp Mercury 2 stroke and lifting strakes. I've only had brief direct experience with the boat during the 'sea trial' but the boat seemed to want to 'squat' with the bow up at speed and not really level out much even with the front half of the boat up on the lifting strakes. This even with various trim adjustments by the prior owner. Engine height appears correct.
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Old 03-23-2019, 03:11 PM
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that's how pontoon boats ride. If you put the bow down you'd have more drag and go slower. What do you want to accomplish with the fin?
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Old 03-23-2019, 04:06 PM
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Originally Posted by Lookinup76 View Post
that's how pontoon boats ride. If you put the bow down you'd have more drag and go slower. What do you want to accomplish with the fin?
My pontoon levels out right away on plane and I have to trim the motor to get the bow up.
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Old 03-23-2019, 04:23 PM
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Short answer is yes one would help

was it plowing? Any difference with moving passengers forward?
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Old 03-23-2019, 04:38 PM
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Originally Posted by SWF Pontoon Angler View Post
My pontoon levels out right away on plane and I have to trim the motor to get the bow up.
you're comparing your Porsche to a ford escort.
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Old 03-23-2019, 05:10 PM
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What was the top speed?
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Old 03-23-2019, 05:11 PM
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I think it’s the FRONT on a pontoon. Not the bow.
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Old 03-23-2019, 07:45 PM
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The fins are supposed to go directly on top of the propeller not behind nor in front. They do not mount all the way to back of trim tab. It depends on prop. There are many videos on youtube but there is a newer one from mfgr on p roper mounting.?lk.,
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Old 03-24-2019, 01:07 PM
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I think the strakes are what is holding the bow up and that was the intent I imagine. (I don't have them). Toons usually hit a wall at around 20 MPH and a whole lot more HP gets you a modest increase in speed until you put strakes on and then you can exploit more HP, usually more than 90 tho. How fast are you going and is it more like 20' or 25'?
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Old 03-24-2019, 02:51 PM
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Don't know speed. (No speedo and I didn't have my GPS with me at the time.) 4 people, all sitting about midships, no one ventured to the "front" fishing chairs at high speed (which are labeled ~ "don't sit here while boat is in motion").
Guessing we were at about 30+ mph based on my calibrated motorcycle-experience wind-in-the-face eyes tearing up tactile gauge. May go ahead and get a Doel fin and try it with and without on a planned venture to Lake Powell next month. Looks to be easy to add/remove. Will report back GPS speed and other results then.
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Old 03-24-2019, 04:41 PM
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Try it and see if it helps. They make no drill models as well. Not great reviews on them staying put but would give you an idea of handling. I have four holes in my plate from doel fins that didn’t help , but a mono hull and went with trim tabs later.

If I were in your place and wanted a foil to bolt on that would not be a throwaway, I would install a Permatrim plate . Never heard a bad review on those.
I have given doel fins a bad review myself. Warping and bad fit.
Pt’s are expensive but you’ll not want it off as it is sound. Google it.
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Old 03-24-2019, 06:51 PM
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Seriously doubt you're doing 30, that's clipping along very well (well above most tubing/skiing speeds and actually faster than most family will want you to cruise, especially if it's windy). Sounds like you are plowing and that little 90 is probably doing all it can. Dual toons take more power to reach cruising/towing speeds (20+). I seriously doubt a cav plate will fix your situation satisfactorily.

Without going the route of a new/bigger motor I'd recommend you check this thing out if you are wanting to turn your suntracker into a all purpose lake boat.

https://www.pontoonwaterglide.com/
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Old 03-24-2019, 11:25 PM
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They are right about anyone riding in front of the rail or high enough to fly over it. There is only one way out if you in, through the prop.
I think you may actually be looking at as good as your are going to do. Usually boats with strakes have 150s and up on them.
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