RC Speedboat Ground Effect Vehicle
ฝัง
- เผยแพร่เมื่อ 18 ม.ค. 2023
- Speedboat Ekranoplan! Use code RCTESTFLIGHT60 to get 60% OFF your first Factor box at bit.ly/3VTl8Zw
Follow rctestflight on IG: / rctestflight_
Thanks to Snapmaker for the Laser cutter/ CNC/ 3D printer: snapmaker.com/snapmaker-2 #Snapmakeristhegift
R/C boat: bit.ly/3XrQkzh
Support rctestflight: / danielriley
Join my discord server to talk about building stuff: / discord - วิทยาศาสตร์และเทคโนโลยี
![ILLSLICK - Homies Feat. LILY [Official Music Video]](http://i.ytimg.com/vi/r6jGK7MumF0/mqdefault.jpg)
Use code RCTESTFLIGHT60 to get 60% OFF your first Factor box at bit.ly/3VTl8Zw
🤣🤣🤣🤣🤣
Loving the content brother! Keep up the great work!
Pro duck trick: bread sucks for birds, it's not very nutricious but still makes them feel like they ate. A better alternative is peas or mashed corn
I came across your channel around a day ago, truly a golden find.
your in for a treat lol. hes got some amazing vids
This guy really has a depth of rc beyond belief, nobody like him!!! Some of his hover craft are the best of any. Keep a eye on this guy. Somebody should hire this guy for sure.
Welcome! He's awesome and one of my favorites. The mix of info and humor, is perfect to me. Plus, I'm not nearly as bright as this guy, so it's fun seeing someone use their brain for something worth wild.
Lol
Ur late
could you try a vehicle like this but with the water propeller on a long stick so it stays fully submerged even when the rest of the craft is in the air? that would be pretty cool
Ground effect katamaran
Yea, exacly what I was thinking, like these electric foil surfboards (but not acutally having the foil, it could be omitted to keep the ground effect using aero only)
Would add a massive amount of complexity/weight, but would be really interesting if could raise/lower the water propeller so it stayed at an optimum height. Or, failing that, a height sensor to disable the water propeller if its too high to be useful.
@@Henrix1998 Yes, it already exists and it's called katamaran...
Mounting the water propeller further down to keep it submerged would have been my comment, too. That it is only half submerged is a lousy reason to say it is a bad idea if you can obviously fix that problem (there are probably other good reasons, like crap in the water). :D If it works well enough, he could do some long-run missions to check the energy consumption of water vs. air. However, I don't know how to make that a good comparison ;-)
Edit: In other words, I would like to see that vehicle be more weird ;-)
I'd recommend to you to look up Surface-Piercing Propellers, ventilating is a desired effect for high speed boats to avoid cavitation. It's not that much information out there but it is an interesting concept.
See my comment above.
Surface piercing props are a deliberate thing in powerboats and yes they do sound annoying especially when they are powered by two huge Volvo engines.
They sound worse with 454 dry exhaust.
I love ur channel
1:27 best part
Looks like your most stable ground effect craft so far!
Yeah this double wing with a bit of consistent hydro drag in the rear seems like a winning combo.
I loved that duck that showed up at 4:52
The boat was ok too.
I really enjoy your content, your strategy to test ideas with minimal design work and no scope creep is very inspiring. If you plan to keep trying experimental waterborne vehicles maybe its a good idea to build a service tug boat with arm/crane to rescue stuck prototypes? Such mini rescue missions would be fun to watch.
There is an analogy that comes to mind: long-tail riverboats Vietnam (they have very long motor-to-prop shafts)
They also steer with that main form of propulsion, but if you could extend the rear-prop-shaft, have it point down more and use the differential thrust of the two front props.. MAYBE that would work?
Awesome project as per usual!
edit: "REAR" prop shaft
Another great project! I also love how the reflecting water around 17:00 caused TH-cam's compression algorithm to self destruct lol
Ditto on the surface piercing props (not sure if available for RC stuff, maybe printable?), or just an extended skeg or whatever to allow the prop to stay submerged even if the tail is at the level you want. Ideally, allow the outdrive to be tiled as well. Full sized boats often will trim in to life the stern to get on plane quicker, then trim out to keep the nose highest and less wetted area at the stern only for speed.
Really fast speedboats, like drag racing boats, have propellers specifically designed to mostly push air as the propeller is barely touching the water. You should look in to how those propellers work 👍
It is not really pushing air, but a very efficient way of pushing water.
I love the onboard shots the the aero wake, really makes you feel like you're on a full sized one looking back. I love how tech has brought backyard model making so far.
Yeah, as a 60 year old, I really feel I was borne to early. Before computer drafting, Cad/cam, 3D printing and before RC and CNC were affordable for an experimenting kid/youngster. (Of corse gyroscopes and such wasn't even available for RC applications.) I learned proper paper design drawing and casting tecniques and such. Feels very stone-age like. But most importantly, finding information was the big hurdle before the internet.
that bit where it was flowing over the wake swells was amazing, i think you inadvertently managed to make your best one yet even though you got there in a bass akwards manner, also if you put movable control flaps on the front canard and tied them to the pitch axis of the flight controller, having them set up to remove lift from that front canard i bet it would stabalize and fly on just the boat propeller with the existing weight and configuration, you could also lower the height of the prop in the water
That shot when you first tested it and Rainier is in the background is really cool.
The config with the air props and 3d printed rudder was sick. It carved such a clean line in the water. Beautiful engineering.
I would love to see you lengthen the shaft of the propellor so that it sticks down further into the water so it doesn't exit the water at the desired ground effect height. I know you think its silly but I would find it really interesting to see a build using only water propellers.
Maybe a prop on the end of the rudder like a hydrofoil board?
Love the cinematography, as always.
Also, servo controlled hydrofoil on the end of the rudder for absolute tail height control! Woo!
Nicee build. Now you need compas, rudder and PID for direction. Just trim heading and let the controller take over.
in hydrodynamics there is a principle that links the viscous friction of water with the resistance it generates on a body moving through the water and it is called Reynolds number. In this formula to calculate the friction the Reynolds number (which contains the surface of the single immersed bodies) is found in the denominator, therefore the smaller the immersed surface is and the greater the resistance it generates. in this case the rudder touching the water originally made very great resistance. the propeller on the other hand is a surface propeller created to push a mixture of water and air and be half immersed, in fact it worked quite well. in fact, racing boats do not have rudders but use a system that orients the propeller axes for maneuvering.
Beautiful video!! Keep it up !
I imagine the rudder drag gave it stability. Something more solid to pull on.
The beauty of this craft just gliding over the water around the 15-minute mark literally gave me chills. Amazing!
Finally realized why I love rctestflight channel so much! Because Daniel has never been told to think outside the Box. Can’t believe it’s been a year since the flying car.
OK! Awesome work!!!
NOW do a water based ground effect vehicle, but you're not allowed to use propellers to generate thrust in the air! You can only use propellers in the water! So it has to fly in ground effect, but get all of it's propulsion from pushing against the water!
Also, read up on surface piercing propellers!
The rudder only flights towards the end looked really great!
The speedboat can become your new recovery vessel. Give it some kind of attachment/hook system so it can tow the other crafts back.
logic still building instead of rapping... i respect it.. been loving the channel for years keep it up!
The rudder alone works surprisingly well, there might be more to explore there. And while I agree mainly that it's best to leave an aircraft in the air, I think a hydrofoil and\or nescelle with a propeller deep in the water could potentially not be too terrible lol.
Even with water being thrown up by the rudder, its still pushing it up not down. The water is being pushed away from the rudder outwardly and down so the rudder is being squeezed an lifted. The upward motion of the water is casued by the outward moving water crashing in to more water. The path of least resistance pushes the water up. That upward movement is pushing down on more water though not the rudder. Also, just like a diver hitting the water, a cavity is created behind the rudder. Water crashing togeather from both sides filling that cavity have nowhere else to go but up. That is also only reacting to more water, not the rudder.
While that upward water energy is not pushing down on the boat, that is energy the boat created. Energy is being robbed from its forward momentem to create the outward movement of the water. So the water shooting up is not pulling it down, it does mean the boat is going slower because of it.
That ad section is truly a lesson in how to grab the viewers attention!
I’d imagine that weight would be something that stabilises such a vehicle. More power to keep it moving, but very stable.
Love watching channels like yours
I really like the combination of twin hulls with rudder and PAR thrust. Looks stable.
On another topic, I wish there was a cheap personal water craft that uses this combo.
this is one of the coolest-looking vehicles you have built. The way it glides across the water is neat. I have no idea how practical, but looks sometimes have utility as well.
Gotta love that fork eye view during the ad
I think this is my favorite of all your groundeffect projects.
PAR thrust pitch control with high gains was the best ground effect control application yet. Simple and self stabilizing regardless of water surface wave action. Think you're on to something Daniel.
BTW: the rear fins should be taller, given all the turbulent air coming off the front canard, batteries and other stuff. It's like the fins were low riding in the rumble seat. With taller fins, you should be able to drop the water rudder and cruise on air motors only with good yaw stability.
Daniel you have found the best way to maximize fun while minimizing expenses. RC hobby was very expensive before everything was manufactured in China. You grew up at the perfect time to take full advantage of your engineering curiosity without breaking your teenage budget. And now all those years of fabrication have led you off into so many fascinating and entertaining directions.
Thank you young man for all of the content and keep up the good work.
You are one of my favorite TH-camrs. I see one of your videos released and I drop everything. lol Thank you for being funny, informative, and just fun.
PLEASE PLEASE PLEASE! we need more videos! I absolutely love this channel and every video! Keep pumping them out please!
This build "almost" reminds me of the TYCO Hovercraft they sold back in the 1990s!
To resolve the water flinging of the Boat Prop, maybe add a "Cylinder/Venturi?" around it to force the water backward?
Have you thought of Vacuum Forming your own Boat Hull and having 4 Pitch Control Blades and 2 rear rudders?
17:35 and here we see the mating ritual of the foamboard experimental rc watercraft. incredible.
There are hydrofoil motor boats that use a propeller on a longer shaft which ensures it stays well underwater even at full speed/lift. It will only worsen the catching on weeds problem though.
Cool video on a very cool craft.
For something you just slapped together, I think it turned out to be the best ground effect vehicle you've ever made. Worked well.
🤣🤣🤣🤣🤣
the ekranoplan arch will never end
I would really, really, really love to see a "Flying Fish" type vehicle, essentially a plane that gets its thrust from a prop mounted on a long, low-swept tail that stays in the water. As real flying fish "fly," they occasionally flap the tip of their tails in the water, which provides sufficient propulsion to stay airborne for (relatively) HUGE distances. I suspect it would be technically challenging to make something like that work, but if you were able to, I think it would be not only cool, but could potentially be revolutionary.
Something you may not have known is that many racing boats actually DO have their propeller half out of the water (and they're designed that way)
Been a while since I was learning about it, but I believe the purpose was to have each propeller blade leaving the water to avoid inefficiency due to cavitation.
That probably doesn't change the conclusion you reached (due to scale and type of operation) but worth knowing that:
A) propeller partly out of water is not by definition "bad"; and
B) water sent upwards is also not always bad (water is always sent out in all directions, you just don't see it when it's all underwater)
The version with the propeller and motor removed is the best ground effect vehicle yet. Skimming millimeters above the surface, only the edge of the rudder carving the water.
I like the shot with the boat heading toward Mt. Rainier.
Racing hydroplanes are designed specifically so that only the tip of the prop is in the water. Counter intuitively perhaps having the prop kicking up a big rooster tail is far more efficient than having the prop totally immersed.
It's super cool that you have so much experience at this that you can just start cutting foam and design on the fly and make something like this that works
Would never have expected this to work so well - great build!
Amazing model, great how the ground effect is snapping in. I believe this mixed solution will be the more efficient up to certain speed, the bottleneck is created by extra drag from stabilization
Been watching this whole series from the start. This might be the coolest one so far. That first shot at 7:30 was so perfect 👌
Watching the ground effect over water is so satisfying!
2:49 You know it’s going to be a good day when you put a flight controller in a boat
Take a long look at some Thai "long-tail" race boats. Notice that a vertical pivoting prop shaft allows dipping the prop deeper. Seems to also help keep the nose down because the pivot is balanced against the CG in a way that will keep control over the nose. Brilliant. Under the hull is a notch that causes airflow lift. There are YT videos that clearly show, that at full speed, often the ONLY thing in the water is the prop shaft... and it's fully submerged.
Just an idea that may inspire something in your head....
Obviously, the rudder sucks out a lot of energy, but it is really nice to see how much more "grip" the plane has to do tighter corners :D
Loving the G.E.V. series!!!! This was a great example
It looks incredible drifting through the corners. Races would be epic.
Gorgeous shots from 4:00 to 4:30!
I race Rc Tunnel boats, they're good fun! But the way it looks with the wings it reminds me of a 4 point Hydroplane. Great video!
High speed props actually work better when they are only 1/2 in the water. When the prop is submerged it has lots of bite and lots of load, but with air the prop frees up, spins a lot faster with the same torque, and the water it pushes flies backwards at a much higher velocity. Counterintuitively making it more efficient.
That being said most RC boats don’t work as well as full speed ones. It would work better if it had more propeller blades and in this case the prop was lower.
Unlimited hydroplanes are a much better example than tunnels, they actually have control surfaces and in glass conditions only the prop touches the water. Tunnels only control the angle of the prop. It would have been cool to see you attempt an automated rear pitch control version of this, like trim tabs that full size flatbottoms have, or a trim of the prop angle like tunnels or catamarans.
I’m so glad you caught that barrel roll on the camera
Love your experiments and descriptions of them!
Water skiing behind a ground effects boat sounds like fun
If you want to build a ground effect vehicle with a water propeller, something like those Thai Longtail river boats might be a good idea, the propeller sticks out way behind the actual boat so it could probably be fully submerged while it's flying
in the last test, i think the hull on the front is adding too much drag, so that's probably why the propeller was having a hard time trying to get the entire hull up to speed.
if you've seen those longtail riverboats from SEA, they use very long prop shafts to keep the propeller submerge, you could probably do the same to also keep it in, or put the submerge the motor and the prop but that'd be more like a hydrofoil with an engine inside.
It's great watching you experiment with things you're interested in!
Love the footage from the back of the boat!
Drop the water prop deeper by adding a lower unit like an I/O marine powertrain.
That flip was sick
Loose the underwater prop. As the craft lifts, you can see the prop torque kicking the back end to the left. It will do this every time unless you add a counter rotating twin to neutralize the difference.
Very cool build, thanks for the video!
Add a longer rear propeller shaft with a reinforced guide tube and lidar that reduces the propeller output once the craft is airborne enough to utilize ground effect but doesn’t let the propeller exit the water. Also play with rudder length and angle.
For the boat water propeller to work in a stable manner while in ground effect it would have to be mounted using a "saildrive" extending sufficiently deep under the bottom of the hull, so that it's never out of the water.
Regarding the propeller throwing up a lot of water you might want to read up on Surface Piercing Propellers. These are intentionally designed to work partially submerged and they have some interesting properties. You find them mostly on high performance powerboats where their ability to work at really high RPM where a normal propeller will cavitate.
That’s what this is…
@@rctestflight Indeed, but they are very sensitive to height in the water, at this small scale a few mm up or down is enough to totally throw it off. Thats not even mentioning the angle the craft and therefore the propeller which is also sensitive.
Not so much only the rpm, in fact thats often not really a factor. Primary usage as far as I know is because it allows you to get any driveshaft/gearbox attached to the propeller out of the water, decreasing drag.
@@rctestflight Thing is you design a surface piercing prop differently than a normal prop. It's larger and the profile and attack angle of the blades is different. I don't remember the details but the fact that it's only partially submerged reduces drag and the way it changes cavitation behavior allows for higher speed at the blade tips, so higher RPM for the size than for a normal prop.
That rudder looks so sharp! Nice!
The frog was a casualty of the last time you did this.
Awesome. Excellent work every time.
That was awesome! Great experiment. You're are a very talented person. Can't wait to see what's next 👏👏👏
Epic
On the point about water motors and rudders causing drag, I'd be tempted to treat them like landing gear on an aeroplane - retract them when you want to fly in the ground effect, deploy them for taxiing and moving like a conventional boat.
Nice Frankenspeedboat! It's ALIVE!!!
Coolest ground effect vehicle in most effective you've made so far
Man I love your videos,
ever single one of them is awesome and inspiring
Big thank you
Great stuff again man. I like that fact your still thinking about this gev idea.
Awesome, I always save your videos till the end of my playlist, like a pudding, save the best till last. Thanks man.
Amazing as always
Another idea to try: extend the water prop axle by like 30cm, like those thai long-tail racing boats. might not be a video on its own, but perhaps a follow-up Short?
Congrats on your Pod Racer!
Bro this thing rips!!! Been following the series for quite a while :))))
Daniel keeps getting closer and closer to hydroplanes! I would love to see some SeaFair coverage this year… they’re WIG boat masterpieces!
I wonder if you could build up enough speed with a Jet-Ski style motor/impeller. Then you wouldnt need the adjustable PAR thrust system and wouldnt have any extra drag when you left the surface of the water.
I had to upvote due to the absolute glee in your laughs when it started working the first time hahhaha!
Reminded me of when I build my first RC hovercraft!
i'm surprise after all this boat project you don't have a tow boat to scoop them out easily. Nice video by the way always waiting your next one
I have every intention of making a flyak! Thanks for sharing
The final thoughts on the water made me think of moving the water prop to the middle of the craft? Cool build
Knew it! Ekranoplan flies/floats again!