Doelfin's, Stingray's, Permatrims, etc etc etc...Whose got '

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John_Madison CT

Well-known member
Feb 17, 2006
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Old Saybrook, CT
I was thinking of adding a Stingray Hydrafoil to my boat. Why? I dunno really as I don't have any problems, but if I could manage a slighly lower planning speed, that would be nice.

Does anyone here run one on their Parker? My boat is a single OB 2520DV and it is NOT stern heavy since i only have one engine.
I have the 2510 with twin F115s. With the weight of two 4-strokes, the center of gravity is further to the rear, and the factory 12" x 12" tabs would not push the bow down enough to get a decent ride in the Ches. Bay chop.

I was going to go to larger tabs, but for $65 a piece, I installed a Cobra Marine plate to each F115. Made a world of difference, and the tabs are much more sensitive.

The plates are solid SS, with a slight downturn to the trailing edge. They bolt to the bottom of the anti-ventilation plate, and thus don't weaken the anti-ventilation plate like the Doelfins do. The Doelfins bolt to the outter edges of the anti-ventilation plate, and over time, the flexing eventually breaks the anti-ventilation plate. The Sting-Ray hydrofoils have a similar problem, because they bolt to the top of the anti-ventilation plate. The Cobra plates, because they bolt to the bottom of the anti-ventilation plate, use the full surface of the anti-ventilation plate as support, and thus don't flex the anti-ventilation plate to the point of weaking it.

The Cobra plates are similar to, but much cheaper than the Permatrim plates. The Permatrims also bolt to the bottom of the anti-ventilation plate, but are narrow and long. The Cobra plates are wider. Not sure which ones work the best, but the Cobras are quite a bit cheaper.

In the end, the plates solved my problem, and allowed me to stay on plane all the way down to about 14 mph--plenty slow to handle some of the big chop in the Bay.

I lost about 1 mph at WOT, but gained about 4 mph slower planing speed and better control.

Here is a link on Cabelas for them (bottom row of pics): ... atcat21276
My Bassboat has a Doelfin which eliminated chine walk and improved my holeshot ten fold. It is not a go-fast, fast bass boat but a bass tracker type. The fins also put me at 50 mph @ WOT.
Esteemed fellow Parker owner,
Put a StingRay on my old boat and it helped get the bow down and eased the steering. It did add extra drag and cost me a 3-4 MPH at WOT and I don't think their claims of better fuel efficiency are true. But it did help and was worth the lost MPG and speed. My Parker 2110 has trim tabs and given the choice, I'll take trim tabs.
I recommend the Permas. I have used them for a full season on twin engines, 2510. They do all that is claimed: Improved bow control and attitude adjustment, a reduced planing speed, able to hold the slow plane, has not adversly affected economy. The only negative is that the "bite" on the water is so much greater than stock, that if you accidently lower an engine significanly lower than the other you better hang on because the boat will yaw over and veer off course.
The Permas may be good, but they are expensive--$300-$400 if I remember.

The Cobra Marine plates I purchased through Cabela's do the same job, without the squirrelly response described above, for only about $65 a plate.