Davis Instruments Doel-Fin Outboard/Outdrive Stabilizer - Black (SS-SMS-5001211)

Easy installation. Very well worth the money. It does everything exactly what was supposed to do. It reduces the bow of the boat getting a faster response time to plane on top speed, does get a noticeable difference of greater gas consumption reduced to a fuel increase- leading to fewer gas trips. The biggest difference between having this versus not having it is how much more smoothly the ride is on top speed, with very little usage of the trim in addition to the planning.To install it takes less than an hour. Very easy to install yourself. Take it out of the box and place it where it should be, make sure measure twice to drill once. Drill the holes with the fins on it, as it has pre-drilled holes to guide it. Place the nuts and bolts on, tighten it snug, but not to over tighten it.Depends on the make and model lower unit to install it really doesn't take long to get it done. I had to remove the prop on my 140 HP I/O. Looks great and does an amazing job for my boat. Great for water tubers and skier's that appreciate it for a faster out of the hole experience.I highly recommend it. Worth every single penny, does pay for itself.

Bolts on easy.DurableStupid cheapFit my alpha 1 Gen 2 but had to use. 90* drill attachment to get in there.I tried aLarger xr3 that had great ratings but was too aggressive for my 4.3lx 20’ cc.Just robbed too much top end and made engine work harder due to drag.I tried this do to smaller size and reputation.It was worth drilling. And if they ever broke, I know the company is around for an exact replacement.Helps w/ faster planningHelps low speed steering, reduced wander.Didn’t rob speed.Keeps the boat flatter in the rough chopKeepsThe bow down a lot but didn’t lose as much trim as other/larger foil.The perfect size to make a difference without being overkill.

87 Boston 13’. Quicker plane and reduced porpoising at full speed. Made for a Boston.

Have a 11 foot Boston Whaler with a 20 hp outboard, with one person, obviously in the back of the boat, it had a very hard time getting plane. I had to lean forward and it took forever. Added the whale tail and problem fixed !!! Got on plane real easy, this product works. But the down side I had , at full throttle my motor stopped pumping water to cool the engine. I slowed down to idle speed and then the water started pumping again. I installed a new water pump and impeller last month. Took it off , problem went away. This maybe be a rare case because I never heard anyone having this problem. We sold the 2 stroke and we are having a brand new 20hp mercury installed. I ordered another tail to install as soon as I get my boat back. I’m hoping the problem was just with old motor. But these tails really work to get your on plane very fast !!

I had to laugh a little bit when stretch was a choice. But when it comes to fuel economy this Doel fin is going to help out plenty in stretching extra mileage out of a gallon of gas. The boat planes up sooner than it did before and stays on plane at slower speeds. Getting out of the hole sucks up the most fuel. So staying on plane at slower speeds and getting out of the hole sooner saves fuel for anyone that would use it. This is the 3rd boat of mine that I've installed the Doel Fin on. It's even helped in cavitation when turning. 75 % of the lift thats generated is from the design. Like the wing of a bird or a plane. The design creates lift. Easy to install, and right from the get go, you'll notice a difference.

Installed in about an hour. I took my time doing measurements and making sure I had it right. Took it to the lake the next day. I have a 2016 Tracker TF with 60 hp Mercury 4 stroke. Amazing difference. Boat is on plane much faster now. Actually can increase rpms to get speed up, which i could never do before because boat would porpoise before I could be max capability out of it. Now it planes fast, trims out easily allowing motor rpm increase and resulted in approx 2-3 mph speed increase. This is a cheap performance increase that really does help. Highly recommend this, or any hydrofoil device.

The design of my boat has all the weight in the back and made it slow to get on plane.After adding this my boat now hops on plane and will stay on at much lower throttle settings, it also made trim adjustments much better and seems to make the steering more effective.It works.

Fit my boat motor great, very easy to put on…Thank you 😀

This makes such a huge difference to boat performance, easy to install, it keeps the nose down and the boat planes really well at lower speeds it also stabilises the boat at speed

Se ve muy fuerte y facil de instalar.

I bought these but I havent bolted them on still because I dont want to wreck my cavitation plate with drill holes in case it depreciates the value of my donk and the next buyer may not want that, crazy I know. why buy it then? dont know. I might do it still in summer or just sell it with the boat when I get bored with it.

For those of you wondering, yes this product fits a 90HP like a glove and can say with confidence that these will work with 100+HP outboards as well as stern drives. For $60 you can’t go wrong for the performance increase and fuel consumption decrease. Very happy with product and quality. For half the price of what I’d pay in a store this is a STEAL!! I’ve bought, repaired, refurbished and flip many boats and I’ve put a foil on all of them and have received performance increases on every boat with this product.