Outboard Hydrofoil BEFORE & AFTER Test | In-Depth Review
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- Опубліковано 16 жов 2024
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Hydrofoils have a lot of controversy around them, with opinions all over the spectrum. Today I test the Stingray Classic JR on my 15hp Johnson outboard on a 8.5ft Aquapro SMR 860. I measure top speed and bow rise angle, and give my opinion on how the boat handles before and after the addition of the stabilizing fin.
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Great video. Straight to the point and shows real data.
Thank you!
This is a great video! I would have maybe suggested adding the time to get on plane though as that is in my opinion more important than top speed most of the time. Also, it would have been interesting to see what the third position on the motor would have done since you increase the bow rise when running without the hydrofoil and I would assume as long as the bow rise was okay with the fin it would have gone about the same as the finless motor.
Dam bro.. the video I was looking for..
Come guys this video deserves more likes!!
Same with mine also it tends to be heavy and unstable on the steering, need to make the friction strong to hold straight, but boat bounces much less at high speed
what an awesome video, i learned a lot from it keep it up! hope to see your channel grow
Thank you so much, glad you liked it!
The fin is providing lift at the back, hence faster to plane and almost half the plane angle. It would seem logical to design it to mount under the existing fin for strength and less flex. With a lower plane angle I would like to know how it handles into waves.
By my counting the lowest trim without a fin was by far the fastest to plane. 0-20mph in under 5secs is really going
Does the back of the boat rise with the fin?
Tried first time on porta bote and 6hp tohatsu. Two heavy people and load, no problem
What brand/model. Have a tohatsu too and want to try it
hello, I have a 6hp outboard motor and a dinghy with an inflatable bottom of 2.5 meters. When I try to glide with it, I get into that state, but very quickly it's as if the propeller is running empty, that sound is heard and nothing from gliding. Does anyone know what I need to do and change to be able to maintain my glide. is such a HYDROFOIL solution for me?
I apologize for the bad language
did the hydrofoil add stability? I have a 20HP suzuki on a decent size 14' and it feels loose at top end.
I tightened the tension for the turning mechanism. its slightly harder to turn at low speed but makes it less crazy while on plane.
Thanks
The reduction in bow rise is nice but I hate to lose 2 mph on the top end. Gteat easy to understand video and The graphics were top notch.
thank you! losing a little top speed was worth it for the more comfortable ride for me, I usually dont go full speed too, just keep it right on plane for the best efficiency and range. Everyone's needs are different though! I have been tempted to try a thick stainless steel plate without any foil shape to it to see how it works.
@@kevinsgarage I suppose the foil acts like a wing, just underwater. Probably lifts the transom up while at the same time adding drag which knocks down your top speed. The plate would be a good experiment. I don't know how it could affect planing though.
@@locker1325 I think it would give a bit of a 'high alpha' effect when the bow rises to help get the bow down, and then create less drag once on plane. Its only theory though until I try it!
You should have tested if it goes into plane at lower rpm too, that way we could also compare the fuel efficiencynpart of it too
I would have, but I didn’t have a tachometer that I could use to gauge that. Going off the sound of the engine the rpm is definitely lower when getting on plane with the hydrofoil
This is the best, most thorough test of Fin vs No fin that I found on UA-cam. So as a result do you prefer to run without the fin installed or with it - so sacrificing a little too speed but a better plane?
Thank you! I opted to keep the fin. The increased stability and lower speed to plane makes piloting the dinghy much more enjoyable.
@@kevinsgarage
Thank you for responding. Sounds great to me. I need to find one suitable for my 6hp Evinrude!! 😳
@@lizzbien4446 I fabricated my own from some sheet aluminium, pretty easy and the difference was amazing, I struggled to get my 2.7 metre rib on the plane if I was alone, Suzuki 9.9 two stroke, with my home made foil it planes in seconds! Super impressive and free!
Good video!everything is as should be with hydrofoil,but plastic ones is crap.hydrofoil has to be made out of metal sheet,less drag...
i got a question tho is this a 2 cilinder 15 hp 4 stroke or 2 stroke ? just curious cause its should go way way faster with such small boat and only 1 person i do with a 8hp 23 24 easy
15hp 2 stroke. I found the CDI box was fried about 2 months after making this video. I topped out about 32mph after replacing it.
Personal experience, I'm running a fin on my 15 hp mercury, on a 14x42 jon boat. Foot controlled trolling motor up front tackle box , fishing poles myself 170lbs and a deep cycling battery . My top speed is 25mph. Add another person it drops to 20 to 22 mph. I was expecting more speed out of that little dingy
Great video thanks I had the same feeling with my hydrofoil
Did you ever try the 3rd trim setting with the hydrofoil to see if it helped you get on plane?
I tried without the hydrofoil and the angle was so extreme I couldn’t get on plane, so I did t bother trying it with the hydrofoil
@@kevinsgarage ok. It definitely would be a great improvement then if with the hydrofoil the 3rd setting was able to get you on plane at all
Yep, you shoulda run the finned config with 3rd trim position.
And - raise the engine 1/2" to eval top speed improvement.
And - make turns to assess ventilation/squirrelliness (for a given speed, say 20mph).
And - time from 2 to 20 mph (holeshot).
Only suggestions; this is a great posting - thanks! I use one answered it was,a great improvement
How many hours do you reach 100 kilometers on a sea with a 40 horsepower by plastic boat
So it slows the boat down?
Beaut little boats, the Aquapro's.
What size is the test boat? 10'?
Ok do not understand all but i see that the fin are no good draw y down 2 knots,,,or am i missing something ?.
If you are looking only for top speed, it’s not for you. If you are looking to get up on plane quicker and cruise at a lower rpm, then this is for you. This will also help you plane better if your boat struggles to get on plane
Ok.🙂@@kevinsgarage
Based on your results no fin is notibly faster but handles less predictable. I'd prefer no fin.
No way With fin is faster Less friction
How did you measure ur bow angle?
Does it bolt on?
Great video,
Good video. Have you tried a different prop for higher speeds?
I would try I lift motor up an inch or more if possible for more top end
Lets have a look at the sharpness /radius of the transom chine first. Hydrofoils help crappy boats .
I bought 1 for my 18' flatbottom I had years ago with a new 30hp Yamaha Short Shaft & I had no control over that boat. No hole shot, poor turning, just bad.
I just bought a used 16' V Alumicraft w/ a 25hp Johnson. It did ok but it Dolphined on me, the front shot straight up trying a hole shot. Now that I have the Whale tail on? Omg! 33mph, the front lays flat, no Dolphin & just a way better control & boating experience.
They are great for small boats & motors.
My mpg increased also.
Hey sense your a local of wa do you know where I can find a john boat trailer?
How did you record the digital speed display?
The fact is any fin will help you get on plane fsct also as I have a 16 ft inflable boat so you must put some weight in the front of the boat to as to help keep the boat nose down if you have to much weight on the back it will not plane fast also I have a different foil hydro so anyone’ will work fine I perfer the one I bolt down tho on my outboard motor
I assume the fuel economy would be worse with the fin then? Great video thanks
Thanks! I think at WOT the economy would be worse, but just over plane would be better since it can plane at lower RPM. Give and take.
I have a 6hp mercury on a 3meter inflatable. I cant get on the plane with full fuel tank and fishing gear. Even with weight in bow and outboard trimmed in the bow rises a lot. Do you think a hydrofoil fin would help ?
Thats a lot of boat for a small motor. Hydrofoils help boats that can already plane do it better. I would suggest an 8 or 9.9hp to be able to get on plane.
weight is a big factor. I have 6hp also, and 3m inflatable also. I can get 400lbs to plane (motor+boat+gas+me+gear), but not 600lbs. The 9.9hp (66% more power) should definitely get 600lbs on plane. Also can experiment with prop pitch and hydrofoil.
What brand hydrofoil is that, installed so quickly?
ua-cam.com/video/jvFdh1X57WI/v-deo.html I made another video about installing it!
* O O, you shouldn't ask these tough questions. If he can't answer that question, I'm not interested in listening to anything else he might have to say.
Thanks man!
What speed app was use on your video?
Fast-Cat with 4 of those of yours and paint-mixer type of propeller... forward wider then rear. Rear lower throttle than front. Steer by throttle variation only. Go slow on fast-cat. Not for high speeds.
How do you know the exact degree of the bow rise ?
I used 2 apps on split screen on my tablet. One that measures speed over GPS, and the other measured what angle the tablet was at.
What are the apps called please ? I wanna test my boat the same way
@@yusufpasta6758 DigiHUD for the GPS speed, and Bubble Level for the bow rise degree.
Thanks
one simple question, how does the fin effect shallow water drive setting ? doesnt it cause the leg to dig in and dive ?
the fin is mostly out of the water when up for shallow water. it doesn't effect it
Fin gives more lift but with more drag.
What app is that ??
what were the top speeds with and without the foil.. i read your results as to when it planed out not how fast it would go
so is it better in any condition like with different boat size/horse power with the hydrofoil installed? please feel free to visit my new born channel!!! Thanks
I have been on a few dinghys with and without the hydrofoil. the hydrofoil difference is apparent on almost all of them
They work absolutely they’ve been tested in engineering dry runs.. especially for handling stability that’s why fish have fins cmon man it’s easy physics..
You should be wearing sunglasses
I usually do, but some some reason didn't while I was filming.
What gps app is that
"DigiHUD for the GPS speed, and Bubble Level for the bow rise degree."
I would rather have the top end speed
raise the engine so it doesnt rob top speed
If raised, it might not even need the fin.
With my outboard I get a lot of splashing on either side of the outboard when on the plane and idea why?
with the fin on? try raising the motor on the transom a bit
You might have a long leg outboard, when the boat is made for short leg, making it stick down too much.
Raise your motor an inch higher on the transom
Test on a canoe!😂 not a boat that doesn't need one! Oh man.
With so Little resistance while foilibg u need a Bigger propeller
I have my eye on one!
What prop did you use in the video? Any results with a higher pitch?
Hydrofoils are a crutch for a bad set up. If you find you need one, it's because your rig is either a} under powered b} poorly propped or c} the engine isn't at the proper height.
There are a ton of under-powered rigs out there using these, but that is why. It's why no one ever complains if their rig has the maximum horsepowered motor attached.
The interesting thing about the boat this test took place on, is that it was rated for 8 hp, and I used a 15. Motor was at the correct height- cavitation plate level with the keel. I still had problems with excessive bow rise without the fin, even when I had an 8hp on it. The problem may come from it just being a short boat at 8.5ft. either way, the fin helped this boat out a lot.
Kevin you are a cutie. ;) thanks for the vid.
You loss 3 to 5 mph I would rather have the speed and a little less control
cant imagine you would be driving that thing far enough for speed to be an issue.