DREHMFLIGHT GANG

Your proficiency in having ideas and being able to put in the effort to make them and document everything for KZfaq is admirable

They are extremely difficult to ride. Especially if you don't already know how to surf/skate/wakeboard/etc.. One thing you seem to have mastered is safetly falling off. You often see surfers 'wipe out' and it looks totally random, but there is often some serious last second movements to aviod injury. Keep it up. Feels amazing once you get good.

I love the advanced flotation device on that FPV drone

to pump foil you need to see-saw your feet: every motion is front-foot-first. Imagine each foot is in a different car of a rollercoaster, they're following the same path through the arc, but at different times. or it's like skate boarding over a bump.

8:40 Fun fact: A group of raccoons is called a "gaze." Another name sometimes used is a "nursery."

Is there no end to your talent, I am always pleased to get a notification of a new video from you.

I’m a 61 year old man who is known for being able to fix or fabricate anything. Unfortunately “everything” is currently limited to wood and metal working and mechanical things like cars, trucks, farm machinery etc. I am soooo impressed with your abilities with computers, 3D printers and pretty much everything you do in your videos. Seriously, I think people like you with your abilities, curiosity and thirst for knowledge are beyond impressive. You inspire me very much.

It looks like it behaves more like a bicycle. If you want to turn, yaw as you found out will cause an adverse roll the other way. However, to keep the board stable in the turn the stem needs to be leaned over such that the force remains directly down through the stem. So... to turn left, yaw right, allow the board to "fall" in the direction of turn (left) and then steer (left) into it to stop the roll. If you watch the boarders when doing a tight turn they are leaned over and to get out of the roll they kick the board to yaw it INTO the roll. Just like a "push steer" on a bike.

As a flight control engineer and wing foiler who has that same slingshot foil kit this was one of the most entertaining KZfaq videos I've ever seen! A couple comments, that particular front wing has excellent lift but because of the low aspect ratio and wide span it's slow, and sluggish to turn. That's part of the reason why the roll control with the linear actuator didn't work well. With that wing you usually keep your stance offset to get more leverage over the wing to turn. If you tried a higher aspect wing it'd be twitchyer, you might have better luck with roll control. Another thing to keep in mind is the CG setup is a huge factor on performance. Everything should center around the center of lift on the front foil otherwise your going to have real difficulty turning smoothly. Really amazing the engineering that went into this, awesome job. Also thank you for supporting open source and publishing your CAD files!

For inspiration you can look to foiling boats and catamarans. In terms of independence between speed and pitch/height you should probably be vectoring the thrust depending on how high the board is using a rotating engine mount. This would increase efficiency. In terms of making it work for a human though, adding engines onto the foil instead of props in the air would be the superior method. Ideally the batteries should be a part of the board i think. Though cooling would probably become a problem as the board in flight doesn't contact the water. The ESCs would probably be cooled the easiest if they were on the foil somehow. With you on top of it you dont need to think about controls at all. You changing your center of mass would be controlling the board. Also tweaking the distance between the foils, their location relative to the center of the board and their size has a large impact on how the board behaves. This is something you didn't include in the video, and that probably could have made your pitch problems easier to solve. Also depending on how big, heavy and fast your human carrying board ends up being, you might want to look at foil designs for kitefoiling or windfoiling as the speeds there are higher and in windsurfing the weight is way higher as well. Oh and get yourself a impact vest. It makes a world of difference when falling at high speeds. Though they aren't as good floatation devices in my experience.

I’ve worked with sensors and microcontrollers on my free time for a couple of years and it usually takes so much time for small benefit. I like how you just “I just add these and those sensor and now it works”. Kudos for mastering them without bragging

"The 1930 Robertson Waterplane ground-effect vehicle powered by an outboard motor". There are pictures and videos, but I don't think I can post a pic in the comments. I saw this the other day and immediately thought this might be something you'd build or at least be interested in knowing existed, if you don't already. In other news... it's getting to be grass cutting season. I hope you are working on your next autonomous mower contraption. I'm a long time subscriber to the channel and grateful for your willingness to share your talents with the world. Keep up the great work! - Stanford

That was very cool. The shots of the foil underwater were really neat. I like how you kept pushing and trying different things to get to this result. Looking forward to your summer board riding. 👍🏻

Try to attach a rudder and some ailerons to the foil and use waterproof servos and a flight controller to help stable the foil.

This channel is the nerdiest and most fun, of nearly all of KZfaq.

As an RC enthusiast and someone who rode an e-foil for the firs time last year, I am incredibly impressed by this video. Extremely fascinating. Keep it up!

By far my favourite uploader! Well done mate! I always love seeing how you troubleshoot and then overcome said problem with real outside the box thinking. Great job 👏👏👏👍👍

Gotta be one of the coolest things I've seen in a while. I can't wait to see the home-grown e foil board - I've been wanting to make my own

I realise you don’t want to cut into your expensive foil. But wouldn’t control surfaces under water give a more direct control? And could help you when standing on it.

Amazing job! Foils are REALLY hard to balance. Even more so in open water with waves and wakes and such. Almost constant adjustments as the conditions change from flat to up the wave to down the wave, etc. Very challenging for us older guys. Kids take to it almost instantly, frustrating. Riding a foil board, pitch is controlled by weight shift forward and back. At the precise balance point where you aren't having to push down with either leg to balance you can go from riding on the water to flying with a slight shift of your hips and no other movement or speed/power applied. Pumping is the hardest for sure. You did well .

Your airfoil has no dihedral. Therefore, no lateral stability with a very high center of gravity. Why not make a foil on your 3 d printer and put in a few degrees of dihedral and see the effects. Or change the current airfoil with higher lift on the ends to see if that improves your stablity. Love the videos, Keep them coming.

This is similar to my senior design project in school. Look up "UF Unmanned Foil" on KZfaq, we added control surfaces to the tail wing and modeled it as a delta-wing in the controller. It was great to see your take on an unmanned hydrofoil! Always hoped I'd see someone try the active weight shifting method.

Cool lesson in center of gravity in relation to your thrust. Looking forward to your future projects!

You should consider heading up to Lake Ballinger. There is a local group of pump foilers that frequently ride at the boat ramp there. They have skills, knowledge and the best pump foil gear available. It's a great crew that I got to foil with while on vacation one day last summer.

Another triumph! So amazing, I'm so happy you are able to share these videos.❤

Control surfaces on the back of the main spar? Like an upper and a lower rudder for better control of which way it wants to twist during maneuvers? Cool stuff!

Long time Kite / wing / surf foiler here, from my experience I think you should try using more counter steering with the props in the front. It should have been possible to get it working with just the weight shifter over the center of gravity and 3 props at the front for differential steering and speed+ height control. The sideways props to help the weight shifter are a genius hotfix but shouldn't be necessary. When you initiate a turn, you can do it by the roll axis, i.e the weight shifter, and by rudder; the differntial motors. But like a bicycle, if you want to initiate a left turn, you (mostly subconsciously) turn the handlebars slightly to the right for a short moment, which makes the bike ride to the right under your body, which makes it easier to "fall" into the left leaning for the left turn. There are nice videos about counter steering with bicycles, showing that you need the ability to steer right to initiate a left turn. Like "The counter intuitive physics of turning a bike" by minute physics. Same goes here with the foil board, and its the same for initiating a turn or getting out of a turn. If the board is leaning to the left alot and you want to get it back to level, you should steer right with the weight shifter, but left with the rudder; the differential steering with the props. In the video it looks like you tried getting the board level again by both steering the weight and the differential thrust to the same direction, or at least kept the heading straight while steering max with the weight shifter, which didn't help and didn't worked. Please try it out, as it is something you can try without rebuilding, just tempering with the steering programming, or try it manually. Would be interesting to see if this is enough to stop using the sideway props to help the weight shifter. They just look like unnecessary overkill to me, lol. Ah, yeah, in your demonstration at 5:21 you clearly showed mapping left weight shift together with the right prop turning on; which is basically rudder left. So you basically try to steer it like a car and force the balance, when you should use counter steering to balance and steer it like a bike.

I applaud your ingenuity and out of the box approach to problem solving. I’m wondering whether due to the density of water, if rather than controlling the movement with propellers above the board, if real time micro adjustments to the underwater foil’s angle of attack, based on height above the water would be a more elegant and efficient way to control the movement. I’d be delighted to collaborate.

This is a great project. What’s funny is that by the time it was stable, you basically made a drone that probably could have flown without the hydrofoil! I’ve been learning to wake foil in boat wake, and these foils are definitely not stable. The yaw/roll coupling is very weird. Makes me wonder why no one has made a foil with dihedral in the wing?

Amazing video. Really stoked to see what you do next with it.

Awesome project! I was watching the roll control part and said outloud, move it back to the tail. I only know that from years of riding foils that the back foot controls the roll. Haha! It would be really cool to use that rig to test foils with. Then we could get much more controlled data on foil setups. Right now it's all about the way foils "feel" and very little standards to measure complete foil performance in the real world. How cool would it be to make a rc rig that would pump a foil! Imagine the data we could get from that! As always, thanks for the great content!

Very cool, you could also build the equivalent to controllable ailerons and rudder to the foil itself leaving the board clean and ridable. You would need a drone type controller to aim for level etc.

Like some other commenters have pointed out, a foil board has roll control via countersteer. However, my understanding of the dynamics of foil boarding suggest a unicycle a closer analog than a bicycle. Probably even closer would be a foiling windsurfer because of your aerodynamic roll control. You successfully created a vehicle with a very unique set of lift/thrust/stability interactions. Your projects are so interesting and admirable!!

I think one of the reasons you were getting so much roll/yaw coupling because the two props you were using for yaw and forward thrust were tilted up. Whenever a motor applied yaw force it was providing part of it's force upwards, creating roll. Separating the yaw and forward thrust motors would allow you to angle your thrust motors up and your yaw motors forwards, removing their influence on roll.

Great video and project. It was impressive to see you riding one and controlling the other, talk about multitasking. So many of your projects inspire me but I don't have your natural abilities, so I watch.

rctestflight the kind of guy to make it a point of pride to condescendingly tell friends at social events that he doesn't work for a weapons manufacturer

one person. bags of talent. great attitude. rc skillz.

I love the weight shift. Wild like to see that on ground vehicles like a crawler.

When you were riding one board and controlling the other board it reminded me of the mini-game in Fusion Frenzy where the players control their character with one thumbstick and a little bomb with the other thumb stick. You try to run your bomb into other characters while avoiding their bombs. It's freaking hard.

This video reminds me of so many of my own experiments, a proportion of which got first tested in the dark too. I wing surf hydrofoil and design my own hydrofoils. My latest project is a mould for a carbon fibre mast. I can tell you that there's not much point in sideways weight shift. If you aren't altering the stabiliser angle then do a long axis weight shift and widen your thrust differential fans and bring them back by the ends of the front foil. Normally the stabiliser compensates for high thrust from a wing. It therefore is adjusted for an upwards pitching moment. use differential on your relocated thrust motors and steer it like a bicycle, steer the foil to tip the board partly sideways in a camber angle and then remove the differential and control speed to hold the G-force in the corner.

You're a genius happy to watch your endeavors. I find your videos are the only ones I can watch all the way through and not bounce. So much crap out there. Rc-er here just been out because of health and monetary issues associated with that. Keep it up!

When foiling I keep the foil and mast underneath me using short-term horizontal rotations. I think of it more like an inverted pendulum problem. Making turns left or right (I mean planning the path I want to take) is done by counter-steering a little bit and letting the lift push you around. (A lot like riding a bicycle!) I think this is the same effect that you observed before implementing the weight shift control mode. It would be neat to see this control model investigated.

Man... this is one of my most favorite projects. I enjoy all of them, but this one is something special. Keep up the great work.

The idea of making a drone with a foil board is a good one. You will achieve much better results with the propulsion behind, and underwater, like jet skis have.

Having tried a e-foilboard for the first time this year, and as a lover of all things R/C this is a 10/10 video! Bravo!

Dude, you keep saying, joke, but that thing is awesome! You know your stuff about tuning stuff. Impressive.

I have some ideas. Add ailerons to the hydrofoil wing. Add an elevator and rudder to the tail. Add a thruster to the mast just above the wing. It will be more efficient to have the trust and control surfaces under water. Then put a waterproof control box in or on the board to protect the electronics.

Board is good for pumpfoil, in the shots you got the balance and start right but you didn't generate enough front foot pressure. Just in case you wanna try this again. Thanks for sharing this very interesting project.

Very cool! I like how much the foil resembles a DLG.

Social media definitely makes that stuff look easy. I mean I can ride almost any board with ease but that’s from like a decade and a half of riding them lol. Pure muscle memory at this point. 100% bust my ass all the time, but now with the added adult fear of dying! Social media is just the highlights. Love the brave bottle quad! Used to fly over water and have to hunt for info on waterproofing and safety with my FPV quads. As shown you can get some neat footage if you’re prepared to dive and man had no fear immediate send!

From what I've seen of pump foiling you need to put a lot of force on the front of the board, almost like you're trying to make it nose dive. I think it's the pitching action that makes it work. It rotates around the center of lift and makes the tail flap in the water, producing thrust.

I said it before and I'll say it again: Get the book Hydrofoils by Ray Vellinga. You're trying to bend the laws of physics with that thrust system. Modify the foil mount instead to get active lift control (and roll control) and use basic flight controller instead. With a pressure channel to the foil, you may even get away with using a normal BMP280 pressure sensor to control ride height.

Waypoint mission next? Waypoint efficiency mission, to test how efficient the foil is compared to no foil?

Good video. Enjoyed seeing the large raft of ducks on the water.

My favorite of all your videos. 🎉 The high quality camera work is always stunning.

I watched your videos and recently moved to Washington State Seattle, immediately recognized nature and realized that now I can one day see your inventions on the water or in the sky

Lake Union and Lake Washington? I enjoyed your approach to the problems. Great work! It worked!

Love the idea without even watching the full video

This guy is so bad ass. I have a CNC machine now and a bunch of 3D printers and tools. Learned Alibre and Plasticity and have been getting good with precision parts. Still a long way to go but this dude is my inspiration. Keep it up!

Great project, great video! Your persistence is inspiring 😀

Ideas into action- new transportation from this well done

7:20 you can clearly see what the issue is: Momentum is having more effect here than the weight shift. If you want to make roll-control with weight, you better use a reaction control via a spinning mass.

Well done you!! ❤ I wager you could rig control surfaces on the foils themselves. E-foiling - wing foiling. wind foiling - kite foiling, will all become accessible to millions. You are a hero.

5 thrusters for 4 dof.. from under to over actuated - a water thruster will remove pitch coupling- and if fully above the foil-plane will eliminate steady state ventilation of the foil (dynamic hopping will still be a thing).

You could potentially make one of these with some sort of internal gyroscope weight similar to “seakeepers” in larger vessels and potentially lower the skill requirements and make these accessible to many people

Genious Daniel! Your brain is admirable! Keep posting please!

YESSSS Daniel is literally doing all the things I’ve been suggesting over the last year and I’m HERE FOR IT

You should add ailerons to the bottom part. Maybe even a rudder.

Pretty cool! Is there anything you can't turn into rc? Cars, planes, drones, boats, hydrofoils.. Is there anything left?

This thing reminds me so much of the Nebuchadnezzar from the Matrix. But for real though... There is something soo majestic about seeing that glider "fly" just beneath the surface!

I absolutely cannot do electrical engineering, or wiring for that matter, but I thoroughly enjoy seeing the outcome of someone that uses their knowledge. I ended up being a carpenter because it was what I enjoyed problem solving, and I can see that here. Bravo! P.S. I fell in love with carpentry in Snoqualmie. I learned my love of the craft on the very lakefronts you test on. It was 2007-ish, so long ago.....

FWIW yaw -> opposite roll coupling in the context of a balancing craft = counter steering. It's how bicycles and motorcycles really almost anything that actually "balances" works. If you want to initiate a left turn you will need a lean (roll) to the left that is appropriate to the speed/turn radius. To initiate that left lean, you first drive the balancing point out to the right. On a bicycle/motorcycle you counter steer right (thus an actual small right yaw as viewed from above), to initiate a left turn, then turn back left only to match the turn radius/lean angle. Your weight shift mechanism was less effective for the same reason it is when you try to ride without hands on a bike, cept the foil doesn't have the self righting ability of a bicycle (provided by rake/trail and a little bit of gyroscopic precession which actually countersteers to stay upright) so it eventually just it just falls over. Instead of a weight shift, it might be interesting to use a reaction wheel mounted horizontally, so you can actually take advantage of the yaw -> opposite roll coupling. I suspect this is really what folks are doing when they ride a foil aggressively. Twisting one way to initiate a turn the opposite way.

Roll control could be achieved with a flywheel with axis of rotation parallel to the board. Just a motor so could control acceleration reasonably well and change inertia of flywheel thus amount of influence on the roll

Loved all the Seattle shots, and your ad in the Arb! I Ran a LOT of miles on those paths, good memories!

Brilliant!! As a foiler I appreciate the effort put into learning to fly. Come up with a jet propulsion system that is affordable like foil drive and look out !

Once again, the fun ended when Magic Blue Smoke left the project.

That is so neat!! Well done! Did you get funny looks from people passing by? I have an e foil board and i use it in places here in Australia where they simply have not seen one before!! Having a foil board that flys without someone on it must be a first too!!!

combine brilliance and enthusiasm and you get this channel!

You are so far above what I’ll ever do, but I love watching it! KZfaq is good for that! I still love your homemade planes from years ago.

Thats such a cool idea, you should write that in the title

ITS OUT FOR BLOOD 14:42 😂

Dude you are so much fun. The perfect bridge between the divergent and the almost-divergent.

🎉 CHALLENGE TIME 🎉 Do a hybrid vehicle capable of goin enough as deep as a lake 💧 , then capable of goin to the surface and rocket 🚀 up to space then land back on earth 🌏. Rules: You can use any vehicle, and use various vehicles in the challenge, but you can’t interfere with it (grab etc) only control it. Has to complete the following challenges: -get on the deepest part on a lake, grab a rock then propell up to the surface and go up to space, then land it back and keep it. Since all the videos of sending thinks to space have 10 million views in majority, it might be fun.

You definitely should build a self-stabilizing hyfrofoil you can ride on!

Idea for easier riding: Use the flight controllers stability sensors to control the foil boards dive planes (make them adjustable) to keep it vertically stable.

As always Daniel, you never cease to amaze. I love your content, it’s always really cool. There’s only one problem that I find. I have no idea what language you are speaking (that’s code for I don’t understand the technical aspects of your builds).

3:00 You discovered Dutch roll!

Pat pend prop inverted graph because flat edge at high speed is a wall and just drag. There are diff needs/ behavior at diff speeds. Low needs small angle of attack, high needs large.

Really clever solutions! I'm amazed the level of effort you put into your projects. In this case though, I think perhaps you should to change your design paradigm. Maybe try a gyroscope.

“I wash myself with an airplane ✈️ on a stick” 🤣

Use a reverse pendulum - fulcrum is attached to a servo shaft mounted to the board, then a rod extending up with a ball weight on the end. Jiggle L, tilt L. Jiggle R, tilt R. Might need to tie in an accelerometer to monitor degree of pitch and adjust the weight speed, but that’s easy.

Thats super cool. As someone who does a lot of foiling, it's cool to see how someone would go about controlling one electronically.

That foil is designed for porpoising which is adding some instability. You may want to reduce the curve of the wing in the center.

One of your best contraptions. 👍👍

A few sessions is not enough to learn pump foiling from a dock, trust me :D Sick build! looks like a super cool project!

Look up dihedral angle. A bit on the hydrofoil would probably help. There is a reason they have it on full size foils.

I'd like to see you do this with your Boston Whaler!

Those crazy Racoons all pepped up on Rhino 69! 😂

Loved this! The FPV hobby has its own mad scientist 🧑‍🔬