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  • Davis Instruments Doel-Fin Hydrofoil
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Davis Instruments Doel-Fin Hydrofoil

88 customer reviews
| 4 answered questions

List Price: $37.99
Price: $24.99 & FREE Shipping on orders over $35. Details
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In Stock.
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  • Doel-Fin improves overall performance - even on boats with well designed hulls
  • Save up to 30% on fuel consumption
  • Faster out-of-the-hole for happier water skiers and wake boarders.
  • Maintain lower planning speeds
  • Simple 15 minute installation (hardware included)
54 new from $22.99
$24.99 & FREE Shipping on orders over $35. Details In Stock. Ships from and sold by Amazon.com. Gift-wrap available.

Frequently Bought Together

Davis Instruments Doel-Fin Hydrofoil + Shoreline Marine Bilge Pump 600 GPH
Price for both: $42.98

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Product Description

Doel-Fin is the original hydrofoil developed by an aeronautical engineer to improve overall performance on all boats with outboard motors or outdrive units. Molded in 2 pieces of guaranteed unbreakable, high-strength plastic, each foil is designed to flex independently to absorb shock. The positive effects include greater stability, consistent planing at lower RPM, faster out-of-the-hole performance, steadier turns, higher top-end speeds and lower bow rise at all speeds.


Product Details

  • Product Dimensions: 14 x 16 x 11 inches ; 2.2 pounds
  • Shipping Weight: 2.6 pounds (View shipping rates and policies)
  • Domestic Shipping: Currently, item can be shipped only within the U.S. and to APO/FPO addresses. For APO/FPO shipments, please check with the manufacturer regarding warranty and support issues.
  • International Shipping: This item is not eligible for international shipping. Learn More
  • Origin: USA
  • ASIN: B0014490TS
  • Item model number: 440
  • Average Customer Review: 4.6 out of 5 stars  See all reviews (88 customer reviews)
  • Amazon Best Sellers Rank: #18,247 in Sports & Outdoors (See Top 100 in Sports & Outdoors)
  • Manufacturer’s warranty can be requested from customer service. Click here to make a request to customer service.

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Customer Questions & Answers

Customer Reviews

Most Helpful Customer Reviews

24 of 24 people found the following review helpful By B. Christensen VINE VOICE on April 15, 2010
Verified Purchase
I installed the Doel-Fins on my 11.5 foot Avon SuperSport RIB (the S3.45 to be exact). The Avon has an older 2-stroke Evinrude 30 hp motor and the Doel-Fins were easy to install without requiring a right-angle drill. I spent a LOT of time measuring and determining placement before I drilled the holes in my cavitation plate, but once I drilled the holes, the rest of the install took maybe 10 minutes at most.

The good stuff:
The Doel-Fin definitely makes a big difference in two areas - getting up on plane and staying there at lower speeds. In fact, I am now able to stay on plane at speeds as low as about 6-8 mph, which allows me to save fuel and create less of a wake while transiting through harbors. Also, prior to installing the Doel-Fin, the boat had a pretty strong tendency to bang up and down when going into a head sea (swell coming toward the boat). While I wouldn't say it was "porpoising", it was close. After installing the Doel-Fin, the ride into a head sea is much smoother and tends to stay on plane much better when throttling down after cresting a swell.

The not-so-good-stuff:

Really, just two things - 1) Definitely reduced top speed. Prior to the Doel-Fin the boat would do about 31 mph at WOT in a lightly choppy sea. After the Doel-Fin, max speed at WOT seems to be about 27 or 28 mph. This represents about a 10% reduction in top speed. Not a big deal, since I don't really operate the boat at WOT much anyway. 2) The Doel-Fin really, really catches kelp! It is very tricky to get in and around the kelp to fish or dive without snagging the Doel-Fin. When this happens, the usually procedure of reversing the prop briefly doesn't always clear the snag.
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8 of 9 people found the following review helpful By Ulator808 on April 23, 2011
Verified Purchase
Had a Doel Fin on my small 15 hp Evinrude that seemed to work well, so decided to give it a shot on my 90hp Yamaha to see if it could fix my cavitation issues. Installation was a snap and had it on in less than 15 minutes. Have been using it for over a month now and my cavitation problems are gone. I have a 15.5' Livingston and used to take forever to get it up on plane. With the Doel Fin, it jumps up on plane as soon as I give it some throttle. I feel that I have way better plane control and my boat also goes faster. I would recommend this product to anybody having cavitation issues. Would buy again if needed.
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4 of 4 people found the following review helpful By mcsd on July 2, 2011
Verified Purchase
I just bought a 17ft polar flats boat with a johnson 50 on it. Before I bought this someone had to sit on the front of the boat to plane. I thought about re propping but decided to try this first. worth its weight in gold. now 2 people over 200lbs can sit on the back and it will plane.
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8 of 10 people found the following review helpful By R. Marshall on July 5, 2006
A fairly good product with some cautions. If you already have stabilizers, this type product has a tendency to make the boat slide around alot in the stern. If I barely use the manufacturer stabilizers it seems to make everything a lot more steady. The Doel-Fin works as advertised in that the boat definitely comes up quicker which is really great! I'm sure it takes a lot of strain off the engine and is helping my GPH on fuel, although I have not had a chance to do an actual measurement yet.

One more thing to think about. The advertisement leads you to assume it will bolt right-on. This was not quite true. Depending on how the fin plates are arranged on your prop, be prepared for some contorsions and acrobatics, not to mention some out of the ordinary tools manipulations to get it installed in the correct place. Once installed, it's great and definitely worth the money.
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2 of 2 people found the following review helpful By sunsetliving on November 23, 2014
Verified Purchase
Truly amazing product! I have dual 35 hp mercury outboards on my 17ft modified Vhull. I put a set of doel fins on each. Launches up on plane amazingly quickly, and the bow never rises during the transition out of displacement mode. Throttle back once skimming on top, and with the lift provided by 2 sets I can stay on a plane at impossibly low speeds. A marvel of physics.
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4 of 5 people found the following review helpful By Timothy M. Freeland on September 13, 2012
Verified Purchase
I put this on a 21 foot Hurricane deck boat with a 90hp Honda outboard. I was having trouble getting the boat on plane with more than 2 people aboard. Now it will plane with 6 aboard under the right conditions and with 4 people no problem. I was pleasantly surprised by how much this product helped.
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1 of 1 people found the following review helpful By Phil B. on August 8, 2013
Verified Purchase
Over several days I did a lot of research concerning hydrofoils. I have a 14 foot mod-v, with 25 hp Honda, which takes forever to get on plane. I decided to take a change on this one. The price was good and the reviews were also very good. Today I tested my install. What a noticeable change. I opened the throttle and within seconds I was on plane. I also noticed an improvement when plowing thorough the waves. I strongly feel I made the correct choice and I'm really impressed with this product. Installation was also a breeze.
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1 of 1 people found the following review helpful By B. T. on January 5, 2015
Verified Purchase
This "Doel-fin" does make a difference. It took forever to get our 9 ft Caribe dinghy on a plane with a Yamaha 9.9 engine. We had to lean way forward even then. After installing this on the motor (an easy install), the dinghy now planes much faster. I think we might have lost a little top end speed due to the increased drag, but not much at all (maybe a knot or two).
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Davis Instruments Doel-Fin Hydrofoil
This item: Davis Instruments Doel-Fin Hydrofoil
Price: $24.99
Ships from and sold by Amazon.com