The main advantage of having an Hydofoil is getting to plane speeds faster and reduce bouncing. I do not think that increasing Top Speed is the main objective. My boat was a bouncer until I installed an SE300 Hydrofoil. It corrected the problem. A few years later I installed a StingRay with similar results. Based on my experience, I will always use an Hydrofoil.
It depends what you use the boat for. If you are trying to pull out a skier with a 90 horse engine using a ski pole the hydro foil is ideal. It will keep the front end of the boat down. I put a bow tank in my boat instead. If you are going for speed or just cruising the setup is different.
Hydrofoil works good on small boats that like to porpoise and it greatly changes the ride for the better. For lager boats with V4 or V6 HP the higher HP will push the boat faster and will have the speed and bow lift. In that case a hydrofoil may not be the best choice.
I will definitely do a re-test! The wind and waves were a bit different so that favoured the hydrofoil off more for speed but I really think they are close! I will make a new video on a glass lake with no wind! It'll be badass! Thanks for watching! 👍😁👍
My '94 Wellcraft 190 CCF with 2005 Evinrude 115 has its bow coming far out of the water before it gets on plane. I cannot go below 15 kts (28 kph) or it will get off plane and start "plowing" with the stern deep in the water. I just pulled the trigger on an SE Sports 300.... I'd love to get more stable even if it will cost me a bit in speed.
If your boat gets nose heavy when on plane at full speed (drags on water) and the prop ventilates when trimming up it might even help get some more speed if the hydrofoil keeps the prop submerged better and you can force the bow up at high speed ;)
A hydrofoil will never decrease your top end speed, “IF” your motor is set at the correct height. If your motor is set at the correct height, your hydrofoil will not even be in the water at top speed, therefore it can’t affect the top speed. The cavitation plate should be about an inch above the water line at plane. This will also make your steering quicker, easier, and your boat will be more responsive. This is why Jack Plates are used.
The answer is ITS NOT WORTH IT! You didn't mention the stress it puts on the transom and the motor itself. The main issue with Hydrofoils is that they are normally used to get your boat on a plane faster, but once your on plane as you have tested it slows down your boat because its still trying to push your nose down even when you dont need it to. Therefore causing extra stress on the transom and putting stress on the motor where it was not designed to have stress for a long period of time. The pushing force is always at an angle (per say) rather than pushing forward. Just a terrible idea. I would recommend the spring loaded trim tabs. They will get you on plane fast. They are adjustable and when you are on plane the force of the water straightens them out and there is no drag like the hydro's give at high RPM.
Like I have mentioned the main reason people install these is to get on plane faster. Even if you are not at full throttle it is still doing the same thing that I mentioned. Basically once you were on the plane it has done it’s job but is still bearing down at an angle. If this was such a good idea the motor manufacturers would make the fins a standard item. But they don’t for the obvious reasons. That’s why I recommend the spring loaded trim tabs. It gets you on plane and once you are They’re the force of the water straightens them up and you do not sacrifice type in speed or any fatigue.
@@Robert-yf4ws The reason why manufacturer does not design motors with foil wings is because it is not needed for all boats. It will have most positive effect on a boat that is rear heavy and have problem to plane at lower speeds. Once the boat is in plane it will not push the nose down but it will keep it more stable and not jump on waves as much. So if you have a light boat and heavy engine it is worth it.
i use my little sunbird with a evinrude 85hp almost exclusively to pull kids around the lake on a tube an try hard aa possible to throw em off ..... i fabricated my own "foil" to harness some of that wasted prop energy and it makes my little ghettobird perform better than ever expected .... it jumps to plane in leas that a third the distance and turns so fast i have to limit myself to prevent turning too sharp and making the ride dangerous..... it works to say the least and id do it again if building another boat
Cool. So youre saying it helped with the steering as well? Im having torque steer issues as well as getting up on plane when everyone is at the rear of the boat. Do you have any other suggestions or mods you did to help with stability and such?
Pls...what do you mean with added stability (easier to go to plane n keep it there on slow speeds?) .the other added thing I coudnt hear/understand. I have the same hydrofoil on a trophy 1903 cc 115 hp 2 stroke but I think I I'll skip it. But interestkng comparison...5 percent slower and 5 percent more fuel consumption with hydrofoil :-(
reioXyhi yah if you are towing someone on a tube it’s more smoother but doesn’t really do anything so it’s hard to justify. If you were having problems getting your boat on plane then this if for you! If not you might not like it.
@@Bansheeboat thanks for your thoughts..I have no problem to go to plane but I do have to small pitch prop...its 15 aluminum and I ordered a 17 ss. Now the rev limiter cuts off :-( Bought the boat for some months ago. I I'll try to do same tests as you did. I suppose pre-owner has a be a big family :-)
One more thing. I like to trim out as much as possible ...always to extreme.. Without proof I suspect at that trim out rig angle the hydrofoil makes the rear to go deeper down ...what I really don't want....in theory this makes sense anyway :-) with this aluminium prop whats on now I can trim out just a little bit before prop starts ventilating (not cavitating) and aluminum prop doesn't grip again before you take RPM,s down. May theory is if you have SS prop the hydrofoil gives more negatives than positives.....will see 🤗
I all I could see is her face smashing down into the metal windshield railing. Why are we not seeing the boat gauges? Top end comparison, how fast you get up on plane, boat handling, behavior when slowing and at slow speeds.
I was wondering what Province you were in? Pigeon Lake Alberta. Nice and Calm. Put the wife in the back seat and you likely would have gained a few more kmph. 69 is good for a Banshee with a 90. I would never put one of those things on my motors. If they really were any good, the moter wouls have come from the Factory with an Anti-Ventilation Plate shaped like that. What Pitch are you running, 17 inch?
For top speed the hydrofoil is out of the water so makes no difference. It's only good for getting on plane quicker and for slower rough water control.
@@BansheeboatI'm in the US 🇺🇸 so we used miles. I installed a hydrofoil on my boat yesterday n I want to take it off cause I loose actual 5 mph 😒 which I'm trying to get more speed out of my volvo penta 3.0 i/o its powering a 1996 larson. I'm running on a 19 pitch prop that barely give me 40mph, whats your suggestion on a prop that can give me more speed with 4500RPM?
Eagle maybe higher pitch slower whole shot but faster speeds maybe try a 21 pitch. Slower off the start a bit but will def be a few knots faster. I would go 3 blade 21 pitch stainless for optimal performance. Also you can trim up quite a bit while still maintaining speed to reduce a bit of leg drag just make sure your engine still drinking water.
Did not look to me you were trying to get top speed . With or without the hydrofoil when looking for the best wot you get up to your best speed then slowly raise your engine until you begin to porpoise at the bow then lower until you stop proposing now you are your best performance. What you did was minimize the surface area on the water of the boat reducing resistance. Engine speed will increase and you can cut the throttle and still maintain your speed. Look on RU-vid and you will see some examples.
@@Bansheeboat Your engine sounds like it could take 2inches more pitch easily, what prop are you running? A 50hp 2cyl 737cc johnson from 1991 does around 63km/h with a 11 1/4" size 21" pitch on a 4,8m regular type fishing boat. Google for Suvi 4800 for almost an identical boat to that. It would do about 56-58 with a 17" prop but the RPM is needlessly high. Good for pulling a skier though, cheers!
@@eamh2002 I will do a full video this week when we go out and we will find out more. Im not exactly sure what prop it has but ill investigate and do a high speed run test.
