With the front wheels also actively turning though, I think there is inherent instability fighting the aerodynamics. Locking the front wheels so they don't turn would reduce but not eliminate it. The scale of the real world road surface to the short wheelbase and tire size is another factor aerodynamics is going to struggle with. A very cool project, but aero is only going to do so much.
@@andrebazenga8639 and why not 🤷🏽♂️ all of us really enjoy watching this stuff so it's awesome that he's making money from it and has a good reason to continue making this awesome content for us :P don't be jealous bro lol
Point is to go fast! means keep it stable, wheel base on its own won't cut it - see section on full size speed record car - but too short a wheelbase is inherently unstable particulary with aero force acting so far outside the wheelbase and C of G .
There is a type of software thats programmable into the flight computer of this RC vehicle known as yaw dampening. Heres what it does: Yaw dampening, sometimes called a stability augmentation system, is a mechanism used in aircraft to reduce unwanted side-to-side oscillations, particularly a phenomenon known as the "Dutch roll". It works by automatically adjusting the rudder, the vertical control surface on the tail, to counter these motions and provide a smoother, more stable flight. Here's a breakdown of what yaw dampening does: Purpose: 1. Reduces unwanted movements: It prevents excessive yawing (side-to-side movement) and rolling, especially the Dutch roll, which is a combination of both. 2. Improves comfort: By counteracting these oscillations, yaw dampening creates a smoother ride for both pilots and passengers. 3.Reduces pilot workload: Pilots don't need to constantly adjust the rudder pedals to counteract these motions, making flying less tiring and demanding. How it works: 1. Sensors: It uses sensors like gyroscopes and accelerometers to detect the aircraft's yaw rate and direction. 2. Control system: These sensors feed information to a control system which calculates the necessary rudder deflection. 3. Rudder adjustment: The control system then sends signals to a servo motor that adjusts the rudder accordingly. Applications: 1. Many modern aircraft: Yaw dampening is a common feature in both jet-powered and propeller-driven aircraft, from small private planes to large airliners. 2. Automatic or manual: Some yaw dampeners are automatic, engaging and disengaging at specific points in flight, while others are manually controlled by the pilot. Additional points: 1. Yaw dampening doesn't replace pilot skill, but it's a valuable tool for maintaining stability and reducing workload. 2. Some aircraft, particularly those with sensitive handling characteristics, may require multiple yaw dampening systems for safety reasons. I hope this explanation clarifies what yaw dampening is and how it works in your RC Streamliner car project featured in this video. Think about this, as it could help you. If you need assistance, I am a freelance programmer. nick@debeentechsolutions.net
70mph is very impressive, the new speed rc car speed record is 204mph, maybe a bigger edfs and blheli escs, you could definitely go 100mph to 150mph. Great Job!
Shouldn’t it be relatively easy to cram a bunch of powerful motors into a very aerodynamic form factor, add just enough batteries for a single run and go?
@@Mike-oz4cv the problem now is the wheel/tire technology is prohibiting things. Tires will just blow apart even tho the car still has more juice in it
@@bigblockbumpside2296 There has to be an easy solution, after all, we just need the tyres to stay on. No need for turning performance or suspension. Even rubber bolted to the wheels could work. For a big RC car you could use the smallest road bike tyres with 349mm rim diameter.
Steel disk wheels. gauge stainless. Not looking for traction just the bottom 1/3 exposed and a nose wheel. It probably needs the battery weight but if not then super capacitors. Might need active wing control like his ground effects boat/car/planes
70 mph is pretty impressive not gonna lie. For a cheap RC car with a depron shell I wouldn’t really compare it to the several 1000 dollar car that got to 200 isn’t really fair
I absolutely love seeing the cool things you build/fly/float/drive in front of the backdrop of our city. Every time I drive over that tall bridge over the lake, I look over the edge and try to spot you down there. Thanks for being passionate enough to build these things, and thanks even more for doing the extra work to film and share these with us.
That thing sounds gorgeous! I noticed this effect when I first saw the Vancouver Indy. It was the sound of the air over the aerodynamics you heard as the cars approached and the sound of the engine was completely masked until the cars passed by. Scale your edf beast up a tad & you'll have a powered longboard!
For powered longboard you’d need a lot of torque, I imagine that his vehicle weighs around 10-15 pounds max meaning probably 10 or more times as many edfs needed to maintain the same acceleration. Overall any type of aero propulsion probably isn’t suited for longboard due to low torque-size ratio
@@sambenedict7804 you may be partially correct but i think you forget the weight added by the extra edfs and the subsequently larger battery to power them. the edf solution likely doesn’t have the energy potential needed for a good powered long board without some fundamental changes. thinking a small jet engine, or of course the simple solution of electric motor but that’s just a regular electric skateboard and would be no fun.
This video man. No negativity just pure discovery and excitement, it's igniting the inventive passion of a kid in their backyard with a saw and some timber. Your projects are building apon themselves and you're going from strength to strength, I look foward to the revolutionary flying machine you're eventually going to build.
It might be useful to add a gps and compass and use, in iNav terms, heading hold mode when steering. That way all you input is speed and your rudder input is setting the heading instead of actually steering.
the only thing I wanna add is the speed record is now 204. James Mccoy beat nick cases 202 run 2 months ago. but it may get neat this weekend by Raz shifren and Kevin talbot. there is a big meet up going on for speed runs. and several ppl are bringing the best of what they have and Raz has done 199 so fingers crossed. love watching the stuff you come up with keep it up.
You beat me to it by 3 weeks! Always wanted to make a flying car and had been at it for the last couple weeks, today I found this while researching fans...
I mentioned this once on your one of your videos, "Why aren't you working for DARPA or participate in USSOCOM Technical Experimentation event?" I argue with people about 'hyper-sonic' tech and they can't comprehend what individuals, such as yourself and other college students are doing, are basically doing in their 'garage'. Just imagine what else is being accomplished by major weapon and tech companies are doing. What you're doing is epitome of our country's educational opportunities which offer the ability to share knowledge, experience, wisdom, and especially the use of one's imagination. In my humble opinion, you're an inspiration, especially to someone who didn't recognize my own abilities until I was much older. Thanks.
This could definitely use some additional mechanical damping and softer springs. Also, make it auto-trim with a lydar sensor in the nose. I think you could probably get it to 100 this way with a new 6s battery. Also, remember that having the center of force directly behind the center of mass will always be the most stable, offsetting your thrust means the center of pressure needs to be corrected aerodynamically, which is not ideal and costs you speed. Notice how the Thrust vehicle has it's engines slung way down low, that's for the reason above, keeping everything as aligned as it can be.
Yes, turning down the dual rates makes a difference. There are speed runs that exceed 200 mph on a 1/10 scale car. The new goal is 205 mph. The 1/14 scale buggy you used can go faster than 70 mph with the stock body. You need a better/ smoother surface for speed runs. A front wing would help too.
It's a 1/7 scale, not a 1/10 scale. This is completely different it's much harder to get to 70mph without power to the wheels. It's not the same. He has a different goal here. Making the buggy go 70 mph using power to the wheels is easy. This is much harder. His issue is not the road surface, His issue is the wheelbase. The body is long and the buggy is on the center axis causing it to overcorrect.
For your consideration. The car needs a bigger wheel base, at least as long as 3/4 the length of the whole body. All land-speed cars have big wheel bases. You should google it. The EDF motors should have aero covers, i'd redo the body to accommodate them inside, or make their own nacelles. Mount the motors in such a way the vector of the thrust force produced is not trying to twist or pitch the car's direction thus making it "meta-stable" at speed. The motor's thrust should have a clear "path", e.g. not encounter any control surfaces like vertical stabilizers. The body could benefit from a good set of well placed stabilizing thins/winglets to help it keep straight and leveled. Brakes, you need mechanical and aero brakes, aero-brakes to first slowdown to a reasonable speed so the mechanical brakes can operate without over heating or suffering catastrophic wear. Best of luck will be looking forward for part 2. :)
@@bragr_ No i did not, but you've completely missed the goal of my comment. If he does decide to further this project he now has this simple list pointing out things to improve in the next version. He has every right to ignore these, follow some and or all. i'm not pointing a gun to anyone, i'm just a person with a higher education on these matters and want to help out. So.. "cool your jets", alright?
I think it would be really cool if your vehicle's thrust came from a pair of horizontal axis cyclorotors, which would allow you to do rapid thrust vectoring. Not only would this eliminate the need for elevators, but you can very quickly change from accelerating forwards to accelerating backwards (braking) without needing to slow down the motors and speed them up in reverse. In other words, it would be a cyclocopter/cyclogyro, but on wheels. :)
I am surprised the wheels of the car were never mentioned, you are going for a speed record on offroad tires. In my opinion that should be optimized before more power is added. Also with roll stabilization enabled 3 wheels may be enough.
Awesome project. Controller tip: use both your thumb and forefinger on the “thumb” sticks. Can hold the transmitters weight with 3 fingers or use the neck strap. The bouncy ride of the chase vehicle your in will cause you to input fluctuations (especially thumbs only) if your able to hold transmitter with 3 finger way it’ll provide the best stability
Why not eliminate drag by reducing the number of wheels in contact with the ground at speed, since the EDF Powered Jet Car is so aerodynamically stable at speed? Would be cool to drive the worlds fasted one-wheel vehicle. (also the shortest possible wheelbase)
I love watching you build these vehicles! It's one of my very favorite parts of the videos! ☺️ And the speed was definitely something to be proud about! You can do anything! You are so stinkin' smart!
What if you tried to make some side pods on that like the Thrust SSC? Could you put the EDCs in series pairs on either side? I feel like creating some pods for your vehicle would help a bit with the drag, though it might be more engineering than its worth, depending on how much you feel like investing into this project.
This is most interesting! To have it run forward in a stable manner, try having the centre of pressure behind the centre of gravity like a model rocket. To move the centre pressure backwards, have bigger fins behind. To move CG forward, move batteries/motors forward. The further the CP is behind the CG, the more stable it will be in the forward motion but it will be more susceptible to turn into cross winds. The car would be rotating about it's CG so that's where the wheels should be. U'll then have a rocket on wheels which will be inherently stable! For more details check out model rocketry stability by G Harry Stein. btw, to find out where the CP is approximately, trace out the outline of the vehicle on a card and find the point where it balances.
First time viewer, love what you're doing. We were thinking if you reduced the length the outer shell by half or even a quarter you wouldn't need a longer wheel base and we think it would improve stability. But great video, really good content for me and my kids to watch and find solutions for problems. Will definitely go thru your videos and see what else you have. Really good job.
I really enjoy your experiments. Not enough of a challenge to get the car to go fast. Now add the need to have a controller with the proper range, the need to see the car for long enough, or the need for a road that is ass-of-the-world enough to not have a lot of traffic, and still straight and in good enough condition. This is also the point at which I simply must recommend to watch "The World's Fastest Indian".
Replace the wheels with narrow steel wheels. The current wheels are designed for grip, which means they create a lot of rolling resistance. Also, 3 wheels is better than 4.
Why don't you try this while on the car: Take a camera with object tracking and use it to keep the car centered on the X axis of the camera using a PID controller In that way, you just need to aim the camera (tripod mounted if possible) the the center of the road and the controller will take care of the rest Edit: like this so he sees it
There is probably a very good chance that the camera doesn’t have a fast enough frame rate for it to really be stable. Also latency would be a big problem. You would also need to find an object tracking camera that can output the position of the object in a format that could easily be transmitted to the car. In reality the camera and object detection are probably too slow and have too much latency for it to really work well.
TIP: you should use like the left temporary switch (with throttle off) as 100% reversed throttlee (or as a temporary revers throttle, and have variable braking with the throttle stick) I would actually like to see this :)
For the pitch down problem, I think, based on the static video and sound, the vehicle is proposing, she has either a small amount of df or lift, and as she comes closer or further to the ground, she keeps stalling aerodynamically, so she makes that typical bouncing movement at around 2-4 Hz. Make some more damped suspension setup, like stiff dampers or friction dampers, also change the tires to something really low profile.
Ahead of the chassis, round the sides of the body or 'knife edge' them. When it turns the flat sides hit a lot of air and that wants to make it push farther off from straight. Get some UHMW tape to apply to the underside of the nose as a skidplate. It's super tough and slick so it'll slide across the surface instead of getting roughed up and causing slowdowns when the nose hits.
Nice job Sir! 🏆 Interestingly you have arrived at an almost identical body shape as George Eyston's Thunderbolt Land Speed record car (aside from your horizontal wings). 312mph in 1937. using two V12 aero engines. Bravo to you. 🇬🇧🏆🇺🇲
Love it. Hopefully with bigger EDFs you also make it a longer wheelbase. I am seriously impressed how stable it was considering that short wheelbase. KUDOS
You're driving nose down because the ducted fans are tall in relation to the CG of the car. I love this project, cannot wait to see if you keep on this trajectory. Subbed
I love this sort of stuff... Maybe put a pivoted wing on the front and a 5g servo. Maybe if the front and rear wings can hit a sweet spot, the car might float level but not quite flying. Good luck !
Reminds me a bit of the Mercedes Benz T80 from 1939. I think you can reduce drag a lot by better encasing the whole underside of the car up to as close as possible to the wheels.
Small error, the rear wings on race cars are not spoilers, as they do not cause turbulent airflow, they are meant to maintain the air laminar while causing a pressure difference, like any wing.
remove shock springs, and put a steel spring hose clamp as a spacer then rebuild. the clips will lock out the suspension and make it much more stable and responsive. I have 1/14 cars that go over 70mph on gps and this is how I make the cars handle perfectly at top speed
Hi maybe you already though about this, but i believe having a swich to enable/disable wheel steering will help you with controll on high speeds, meaning that when you start accelerating wheel steering is enabled but at a certain speed wheel steering becomes too unstable/uncontrolable so having a swich to turn it off and use only the rudders to controll steering(yaw) while on high speeds with be more stablwe that using the wheels.
Pretty fun video! It’s important to note that even cars with serious downforce and lift killing devices still produce lift as they progress. The net force on many racing cars likely remains positive vs negative. As we know the main point is to maintain traction, for both maneuvering and power delivery. A bit different with your ride since its thrust propulsion, but some down force equally distributed on the car could’ve aided in ride stability more so than the fins, which also had to compete with turbulence I bet
With respect, this is only true of salt flats speed record cars. F1 for example produces roughly 3,000 kg of downforce at 300 km/h these days. NASCAR is making exactly 1 ton of aerodynamic downforce this year at 200 mph. The key here is that non max speed cars are engineered to make more downforce as speed increases. This force increases as a square function of speed.
Hey it looks like your unstable yaw is a result of too much vertical cross-sectional area in front of the CG/wheels. Just looking at it from the side, it looks like that area in front of the wheels is very similar to the area behind them, even considering the vertical stabs. When they put small planes on floats, more vertical area is added to the tail. Look up a Beaver floatplane and you'll notice the little extra vertical piece that's hanging under the tail. That's because the floats add more vertical cross section in front of the CG than aft. So when a little yaw is introduced, the air hits those adding instability. So, you make the vertical stabilizer bigger to counteract that. A band-aid for the car would be to make the vertical stabs bigger, but that's draggy. A more general fix would just be to move the whole body aft relative to the car, so little turns don't result that oscillatory instability which definitely cause a whole lot of drag. I think a missile/torpedo/arrow concept could also do well, but it's a more complicated shape to build.
Reminds me of all the "wacky" science experiments in the 1970s and 80s. Just the coolest stuff that looked so unreal, and yet was. I guess science and technology makes fun radical jumps ever other decade or so.
3:37 “Can you run the fans backwards” The direction of rotation alone won’t make any difference with fixed pitch propellors, it’s the angle of the propellor blades that will. Real reverse thrust propellor / turbo prop engines have a variable pitch propellor hub that turns the propellers around.
Hey, I'm not no engineer or nothing but I think it your "vertical stabilizers" where spaced out a little more (width of the vehicle at least) it will help keep it straight.
That's kind of a thing already. They are called control line air planes. They used to be really popular before modern rc electronics became so cheap and readily available.
Use a thrust tube, the length of the diameter of the fan. Exhaust should be about 85% of the fan swept area (surface area inner diameter shroud, minus surface area of the motor area. Multiply that by .85 and get the diameter for that surface).
if it is touching the ground, the wheelbase has an effect. It needs to be longer. If the intension is to stabilize with only aerodynamics, then the wheels need to not be a factor. This means that the car needs to be airborne
In case you didn't know (you probably did tho) the land speed record cars are driven on carefully chosen terrain, asphalt and concrete aren't great conditions for your car
everybody commenting about a longer wheelbase...the entire point is, to stabilize it with aerodynamics and not the wheelbase
With the front wheels also actively turning though, I think there is inherent instability fighting the aerodynamics. Locking the front wheels so they don't turn would reduce but not eliminate it. The scale of the real world road surface to the short wheelbase and tire size is another factor aerodynamics is going to struggle with. A very cool project, but aero is only going to do so much.
I think the whole point was simply to make money.
@@andrebazenga8639 and why not 🤷🏽♂️ all of us really enjoy watching this stuff so it's awesome that he's making money from it and has a good reason to continue making this awesome content for us :P don't be jealous bro lol
Point is to go fast! means keep it stable, wheel base on its own won't cut it - see section on full size speed record car - but too short a wheelbase is inherently unstable particulary with aero force acting so far outside the wheelbase and C of G .
@@jabberwockytdi8901 very well said.
I kept hoping during those high speed passes that you’d hit your secret swing-wing deploy button and absolutely launch it into the sky
I vote for this to be incorporated
@@moretrash4you seconded
@@chandar4959 Thirded
@@arduav1 fortheded
@@GiffysChannel fifthedthfifth
I'd love to see a ground effect vehicle that has a single wheel with suspension
It could work, but I think the wheel would have to be wider than a normal wheel for takeoff
super cool idea
like a glider when landing!
Like the mono-ski thingies in The Last Jedi??
@@lualdiz hadnt thought of it but sure that would be cool too!
There is a type of software thats programmable into the flight computer of this RC vehicle known as yaw dampening.
Heres what it does:
Yaw dampening, sometimes called a stability augmentation system, is a mechanism used in aircraft to reduce unwanted side-to-side oscillations, particularly a phenomenon known as the "Dutch roll". It works by automatically adjusting the rudder, the vertical control surface on the tail, to counter these motions and provide a smoother, more stable flight.
Here's a breakdown of what yaw dampening does:
Purpose:
1. Reduces unwanted movements:
It prevents excessive yawing (side-to-side movement) and rolling, especially the Dutch roll, which is a combination of both.
2. Improves comfort:
By counteracting these oscillations, yaw dampening creates a smoother ride for both pilots and passengers.
3.Reduces pilot workload:
Pilots don't need to constantly adjust the rudder pedals to counteract these motions, making flying less tiring and demanding.
How it works:
1. Sensors:
It uses sensors like gyroscopes and accelerometers to detect the aircraft's yaw rate and direction.
2. Control system:
These sensors feed information to a control system which calculates the necessary rudder deflection.
3. Rudder adjustment:
The control system then sends signals to a servo motor that adjusts the rudder accordingly.
Applications:
1. Many modern aircraft:
Yaw dampening is a common feature in both jet-powered and propeller-driven aircraft, from small private planes to large airliners.
2. Automatic or manual:
Some yaw dampeners are automatic, engaging and disengaging at specific points in flight, while others are manually controlled by the pilot.
Additional points:
1. Yaw dampening doesn't replace pilot skill, but it's a valuable tool for maintaining stability and reducing workload.
2. Some aircraft, particularly those with sensitive handling characteristics, may require multiple yaw dampening systems for safety reasons.
I hope this explanation clarifies what yaw dampening is and how it works in your RC Streamliner car project featured in this video.
Think about this, as it could help you.
If you need assistance, I am a freelance programmer.
nick@debeentechsolutions.net
man if only that one plane that crashed didn’t have its yaw dampers fail
70mph is very impressive, the new speed rc car speed record is 204mph, maybe a bigger edfs and blheli escs, you could definitely go 100mph to 150mph. Great Job!
You could also potentially use a jet turbine when the control system matures.
Shouldn’t it be relatively easy to cram a bunch of powerful motors into a very aerodynamic form factor, add just enough batteries for a single run and go?
@@Mike-oz4cv the problem now is the wheel/tire technology is prohibiting things. Tires will just blow apart even tho the car still has more juice in it
@@bigblockbumpside2296 There has to be an easy solution, after all, we just need the tyres to stay on. No need for turning performance or suspension. Even rubber bolted to the wheels could work. For a big RC car you could use the smallest road bike tyres with 349mm rim diameter.
Steel disk wheels. gauge stainless. Not looking for traction just the bottom 1/3 exposed and a nose wheel.
It probably needs the battery weight but if not then super capacitors.
Might need active wing control like his ground effects boat/car/planes
70 mph is pretty impressive not gonna lie. For a cheap RC car with a depron shell I wouldn’t really compare it to the several 1000 dollar car that got to 200 isn’t really fair
You are not wrong, though there are off the shelf wheel driven cars of the same small size doing 70mph, for not an enormous amount of money.
@@GoldenCroc True. Still pretty cool though I think
I absolutely love seeing the cool things you build/fly/float/drive in front of the backdrop of our city. Every time I drive over that tall bridge over the lake, I look over the edge and try to spot you down there. Thanks for being passionate enough to build these things, and thanks even more for doing the extra work to film and share these with us.
for brakes you could swap the spur gear for a metal disk and use a servo for to press a pad against is essentially making a disk brake
and deploy a mini parachute for extra style points.
That thing sounds gorgeous! I noticed this effect when I first saw the Vancouver Indy. It was the sound of the air over the aerodynamics you heard as the cars approached and the sound of the engine was completely masked until the cars passed by.
Scale your edf beast up a tad & you'll have a powered longboard!
I like that sound too.
For powered longboard you’d need a lot of torque, I imagine that his vehicle weighs around 10-15 pounds max meaning probably 10 or more times as many edfs needed to maintain the same acceleration. Overall any type of aero propulsion probably isn’t suited for longboard due to low torque-size ratio
@@sambenedict7804 you may be partially correct but i think you forget the weight added by the extra edfs and the subsequently larger battery to power them. the edf solution likely doesn’t have the energy potential needed for a good powered long board without some fundamental changes. thinking a small jet engine, or of course the simple solution of electric motor but that’s just a regular electric skateboard and would be no fun.
This video man. No negativity just pure discovery and excitement, it's igniting the inventive passion of a kid in their backyard with a saw and some timber. Your projects are building apon themselves and you're going from strength to strength, I look foward to the revolutionary flying machine you're eventually going to build.
It looks so freakin awesome! Imagine it with steel wheels on a salt flat 🔥
Salt flats are not really all that flat on such a small case
To really get it flat enough for a car with an inch of travel it has to be ice. Frozen lake or speed skating rink. Probably not long enough.
I believe a longer wheelbase could provide enough stability to keep it going straight
Road one of those,u wont believe wat happend..¿¿¿
It might be useful to add a gps and compass and use, in iNav terms, heading hold mode when steering. That way all you input is speed and your rudder input is setting the heading instead of actually steering.
Would the compass speed/precision be enough though?
@@dcnick3 It wouldn't be hard to try
the only thing I wanna add is the speed record is now 204. James Mccoy beat nick cases 202 run 2 months ago. but it may get neat this weekend by Raz shifren and Kevin talbot. there is a big meet up going on for speed runs. and several ppl are bringing the best of what they have and Raz has done 199 so fingers crossed. love watching the stuff you come up with keep it up.
You beat me to it by 3 weeks! Always wanted to make a flying car and had been at it for the last couple weeks, today I found this while researching fans...
I mentioned this once on your one of your videos, "Why aren't you working for DARPA or participate in USSOCOM Technical Experimentation event?"
I argue with people about 'hyper-sonic' tech and they can't comprehend what individuals, such as yourself and other college students are doing, are basically doing in their 'garage'. Just imagine what else is being accomplished by major weapon and tech companies are doing.
What you're doing is epitome of our country's educational opportunities which offer the ability to share knowledge, experience, wisdom, and especially the use of one's imagination.
In my humble opinion, you're an inspiration, especially to someone who didn't recognize my own abilities until I was much older. Thanks.
9:00 lmao. His buddy is like “bro…that was fast for a full scale car”
Hands down one of, if not my favourite creator out there, you’re a fkn legend bro, keep it up 🔥
This could definitely use some additional mechanical damping and softer springs.
Also, make it auto-trim with a lydar sensor in the nose.
I think you could probably get it to 100 this way with a new 6s battery. Also, remember that having the center of force directly behind the center of mass will always be the most stable, offsetting your thrust means the center of pressure needs to be corrected aerodynamically, which is not ideal and costs you speed. Notice how the Thrust vehicle has it's engines slung way down low, that's for the reason above, keeping everything as aligned as it can be.
Yes, turning down the dual rates makes a difference. There are speed runs that exceed 200 mph on a 1/10 scale car. The new goal is 205 mph. The 1/14 scale buggy you used can go faster than 70 mph with the stock body. You need a better/ smoother surface for speed runs. A front wing would help too.
It's a 1/7 scale, not a 1/10 scale. This is completely different it's much harder to get to 70mph without power to the wheels. It's not the same. He has a different goal here. Making the buggy go 70 mph using power to the wheels is easy. This is much harder. His issue is not the road surface, His issue is the wheelbase. The body is long and the buggy is on the center axis causing it to overcorrect.
@@FarmerFpv What's up bro!
For your consideration.
The car needs a bigger wheel base, at least as long as 3/4 the length of the whole body. All land-speed cars have big wheel bases. You should google it.
The EDF motors should have aero covers, i'd redo the body to accommodate them inside, or make their own nacelles.
Mount the motors in such a way the vector of the thrust force produced is not trying to twist or pitch the car's direction thus making it "meta-stable" at speed.
The motor's thrust should have a clear "path", e.g. not encounter any control surfaces like vertical stabilizers.
The body could benefit from a good set of well placed stabilizing thins/winglets to help it keep straight and leveled.
Brakes, you need mechanical and aero brakes, aero-brakes to first slowdown to a reasonable speed so the mechanical brakes can operate without over heating or suffering catastrophic wear.
Best of luck will be looking forward for part 2. :)
You're missing the whole point of the video. Of course you could have a bigger wheel base but then it wouldn't require active stabilization.
@@bragr_ No i did not, but you've completely missed the goal of my comment. If he does decide to further this project he now has this simple list pointing out things to improve in the next version. He has every right to ignore these, follow some and or all. i'm not pointing a gun to anyone, i'm just a person with a higher education on these matters and want to help out. So.. "cool your jets", alright?
The braking solution worked well... all these little experiments are helping you gain ever more insights.
I think that a longer wheelbase might keep it more stable and reduce oscillations that are likely robbing you of speed and efficiency.
I think it would be really cool if your vehicle's thrust came from a pair of horizontal axis cyclorotors, which would allow you to do rapid thrust vectoring. Not only would this eliminate the need for elevators, but you can very quickly change from accelerating forwards to accelerating backwards (braking) without needing to slow down the motors and speed them up in reverse.
In other words, it would be a cyclocopter/cyclogyro, but on wheels. :)
id like to see you do a long range autonomous zeppelin someday. thatd be pretty cool imo.
I'm impressed. You solved a tricky problem...control and stability. At that scale? Yep. Tricky. Well done!
Curious if placing the the engines farther ahead of the carriage increases stability. Pretty cool build
There's a few scenes where the whirring sounds like old school sonic speeding up lol
I just love your videos!
Keep up the great content.
Love from Germany.
Somewhat looks like Soviet era sea monster ground effect ship which is pretty cool
I am surprised the wheels of the car were never mentioned, you are going for a speed record on offroad tires. In my opinion that should be optimized before more power is added. Also with roll stabilization enabled 3 wheels may be enough.
Awesome project.
Controller tip: use both your thumb and forefinger on the “thumb” sticks. Can hold the transmitters weight with 3 fingers or use the neck strap.
The bouncy ride of the chase vehicle your in will cause you to input fluctuations (especially thumbs only) if your able to hold transmitter with 3 finger way it’ll provide the best stability
I would try adding side stabilization to the rear wing, that should keep it stable horizontally
I think he said it had yaw stabilization
@@davidsteinhour5562 well as far as I can tell from the video he still really struggled to keep it under control
The "SSC" in Thrust SSC is for "Super Sonic Car" which is how i remember the acronym. Fantastic video as always
How about some more long distance autonomous flying? Or something with a helicopter? 👍👍👍
71mph is honking along, especially for such a low-cost and simple set-up. Be proud!
Why not eliminate drag by reducing the number of wheels in contact with the ground at speed, since the EDF Powered Jet Car is so aerodynamically stable at speed?
Would be cool to drive the worlds fasted one-wheel vehicle.
(also the shortest possible wheelbase)
@rctestflight This a S C A M 👆
I love watching you build these vehicles! It's one of my very favorite parts of the videos! ☺️
And the speed was definitely something to be proud about! You can do anything! You are so stinkin' smart!
What if you tried to make some side pods on that like the Thrust SSC? Could you put the EDCs in series pairs on either side? I feel like creating some pods for your vehicle would help a bit with the drag, though it might be more engineering than its worth, depending on how much you feel like investing into this project.
This is most interesting! To have it run forward in a stable manner, try having the centre of pressure behind the centre of gravity like a model rocket. To move the centre pressure backwards, have bigger fins behind. To move CG forward, move batteries/motors forward. The further the CP is behind the CG, the more stable it will be in the forward motion but it will be more susceptible to turn into cross winds. The car would be rotating about it's CG so that's where the wheels should be. U'll then have a rocket on wheels which will be inherently stable! For more details check out model rocketry stability by G Harry Stein.
btw, to find out where the CP is approximately, trace out the outline of the vehicle on a card and find the point where it balances.
this looked like it was such a cool project to make, i wish i had the recources for this kind of stuff
@rctestflight is this real?
2 feature proposals:
Speed dependent rudder
Differential brakes with a servo pushing on each from wheel.
Nice build 😎💪👌
Reverse thrust for braking?
First time viewer, love what you're doing. We were thinking if you reduced the length the outer shell by half or even a quarter you wouldn't need a longer wheel base and we think it would improve stability. But great video, really good content for me and my kids to watch and find solutions for problems. Will definitely go thru your videos and see what else you have. Really good job.
Cheeseburger
No
I really enjoy your experiments. Not enough of a challenge to get the car to go fast. Now add the need to have a controller with the proper range, the need to see the car for long enough, or the need for a road that is ass-of-the-world enough to not have a lot of traffic, and still straight and in good enough condition.
This is also the point at which I simply must recommend to watch "The World's Fastest Indian".
Bro you are insane! Love your content! Cheers from Denmark!
You are the best, keep pushing it! Imagine carbon fiber body, two rc turbine engines and improved wheels!
Replace the wheels with narrow steel wheels. The current wheels are designed for grip, which means they create a lot of rolling resistance. Also, 3 wheels is better than 4.
Like last 5-10 videos, you were secretly building future hovercraft. badass.
Why don't you try this while on the car:
Take a camera with object tracking and use it to keep the car centered on the X axis of the camera using a PID controller
In that way, you just need to aim the camera (tripod mounted if possible) the the center of the road and the controller will take care of the rest
Edit: like this so he sees it
There is probably a very good chance that the camera doesn’t have a fast enough frame rate for it to really be stable. Also latency would be a big problem. You would also need to find an object tracking camera that can output the position of the object in a format that could easily be transmitted to the car.
In reality the camera and object detection are probably too slow and have too much latency for it to really work well.
I love that Doppler effect as it passes you by! It sounds sweet!
«You say that like thats not incredibly fast»
Took the words right out my head
I know seattle too well, I instantly knew exactly where you were the last few videos.
Didn't expect to learn more about the SSC from this video but I guess I should've seen it coming from the title
TIP: you should use like the left temporary switch (with throttle off) as 100% reversed throttlee (or as a temporary revers throttle, and have variable braking with the throttle stick)
I would actually like to see this :)
For the pitch down problem, I think, based on the static video and sound, the vehicle is proposing, she has either a small amount of df or lift, and as she comes closer or further to the ground, she keeps stalling aerodynamically, so she makes that typical bouncing movement at around 2-4 Hz. Make some more damped suspension setup, like stiff dampers or friction dampers, also change the tires to something really low profile.
Ahead of the chassis, round the sides of the body or 'knife edge' them. When it turns the flat sides hit a lot of air and that wants to make it push farther off from straight. Get some UHMW tape to apply to the underside of the nose as a skidplate. It's super tough and slick so it'll slide across the surface instead of getting roughed up and causing slowdowns when the nose hits.
"didn't explode though"
This is the kind of positivity the world needs!
Nice job Sir! 🏆
Interestingly you have arrived at an almost identical body shape as George Eyston's Thunderbolt Land Speed record car (aside from your horizontal wings).
312mph in 1937. using two V12 aero engines. Bravo to you. 🇬🇧🏆🇺🇲
Man I really want to see you take this to the next level, a full land speed RC car would be mental
"thanks for watching bye"
I've just started watching your channel, and when you say that line you sound a lot like Ben from Applied Science.
Love it. Hopefully with bigger EDFs you also make it a longer wheelbase. I am seriously impressed how stable it was considering that short wheelbase. KUDOS
71 mph is impressive especially since you took a new approach to fast rc cars
You're driving nose down because the ducted fans are tall in relation to the CG of the car. I love this project, cannot wait to see if you keep on this trajectory. Subbed
Also in relation to it's center of pressure, I'm an aeronerd 😂
That speed record you keep talking about was on a lot more power too. Comparing volts to volts, I’d say you’ve got it beat
I love this sort of stuff... Maybe put a pivoted wing on the front and a 5g servo. Maybe if the front and rear wings can hit a sweet spot, the car might float level but not quite flying. Good luck !
i lost a CR game to watch this video and I don't regret it so far
Reminds me a bit of the Mercedes Benz T80 from 1939. I think you can reduce drag a lot by better encasing the whole underside of the car up to as close as possible to the wheels.
Good job steering and keeping it stable. Some of them budget rc buggies only have brass bushes for bearings.
Always blows me away the stuff that you just seem to throw together for the fun of it... Keep up the good work... Love your vids!
Oh yes - those EDFs definitely need to get into a ram effect water craft with the exhaust ducted to the underside of the wing!
Small error, the rear wings on race cars are not spoilers, as they do not cause turbulent airflow, they are meant to maintain the air laminar while causing a pressure difference, like any wing.
remove shock springs, and put a steel spring hose clamp as a spacer then rebuild. the clips will lock out the suspension and make it much more stable and responsive. I have 1/14 cars that go over 70mph on gps and this is how I make the cars handle perfectly at top speed
0:34 This was the perfect opportunity to explain the opposite ground effect :).
I can't wait to see what information you'll dissect from testing and research.
Absolutely fascinated with your work and content.
Thanks a ton!
I remember when you did this in early days of fpv ...awesome
Hi maybe you already though about this, but i believe having a swich to enable/disable wheel steering will help you with controll on high speeds, meaning that when you start accelerating wheel steering is enabled but at a certain speed wheel steering becomes too unstable/uncontrolable so having a swich to turn it off and use only the rudders to controll steering(yaw) while on high speeds with be more stablwe that using the wheels.
Thought you would get an engineering job. You got so much ingenuity.
definitely think having the car steer and the edf's propel would be easily more controllable.
Love this build! Longer wheelbase! Give it all the length. Send it!
Pretty fun video! It’s important to note that even cars with serious downforce and lift killing devices still produce lift as they progress. The net force on many racing cars likely remains positive vs negative. As we know the main point is to maintain traction, for both maneuvering and power delivery. A bit different with your ride since its thrust propulsion, but some down force equally distributed on the car could’ve aided in ride stability more so than the fins, which also had to compete with turbulence I bet
With respect, this is only true of salt flats speed record cars.
F1 for example produces roughly 3,000 kg of downforce at 300 km/h these days.
NASCAR is making exactly 1 ton of aerodynamic downforce this year at 200 mph.
The key here is that non max speed cars are engineered to make more downforce as speed increases. This force increases as a square function of speed.
Best RC channel on youtube. No doubt
Na mine is 😂😉
Hey it looks like your unstable yaw is a result of too much vertical cross-sectional area in front of the CG/wheels. Just looking at it from the side, it looks like that area in front of the wheels is very similar to the area behind them, even considering the vertical stabs.
When they put small planes on floats, more vertical area is added to the tail. Look up a Beaver floatplane and you'll notice the little extra vertical piece that's hanging under the tail. That's because the floats add more vertical cross section in front of the CG than aft. So when a little yaw is introduced, the air hits those adding instability. So, you make the vertical stabilizer bigger to counteract that. A band-aid for the car would be to make the vertical stabs bigger, but that's draggy. A more general fix would just be to move the whole body aft relative to the car, so little turns don't result that oscillatory instability which definitely cause a whole lot of drag. I think a missile/torpedo/arrow concept could also do well, but it's a more complicated shape to build.
This video is exactly why I prefer a wheel radio as opposed to the traditional rc flying (sticks) radio.
Reminds me of all the "wacky" science experiments in the 1970s and 80s. Just the coolest stuff that looked so unreal, and yet was. I guess science and technology makes fun radical jumps ever other decade or so.
brilliant compared to the others out there trying to build high speed RCs. I have no doubt you can take the record
Crazy impressive for such a short wheelbase.
3:37 “Can you run the fans backwards”
The direction of rotation alone won’t make any difference with fixed pitch propellors, it’s the angle of the propellor blades that will. Real reverse thrust propellor / turbo prop engines have a variable pitch propellor hub that turns the propellers around.
Would be interesting to make a plane with the same EDFs and compare the speed both reach. Comparing an airplane vs a car efficiency
love that youre using F1 examples!
Hey, I'm not no engineer or nothing but I think it your "vertical stabilizers" where spaced out a little more (width of the vehicle at least) it will help keep it straight.
The unbroken sentence "That's all for now bye I smell a hot LiPo" is now in my lexicon.
I would comment some suggestions but I already know you will test and retest many different of your own ideas. Good stuff!
many aeroplanes have symmetrical aerofoils, they certainly do create lift given a suitable angle of attack.
Idea:
You know the circle endurance runs you've done in your yard?
Could you do one with a small, slow-flying plane?
That's kind of a thing already. They are called control line air planes. They used to be really popular before modern rc electronics became so cheap and readily available.
Use a thrust tube, the length of the diameter of the fan.
Exhaust should be about 85% of the fan swept area (surface area inner diameter shroud, minus surface area of the motor area. Multiply that by .85 and get the diameter for that surface).
lol I like the buddy
“You say that like it’s not incredibly fast”
if it is touching the ground, the wheelbase has an effect. It needs to be longer. If the intension is to stabilize with only aerodynamics, then the wheels need to not be a factor. This means that the car needs to be airborne
In case you didn't know (you probably did tho) the land speed record cars are driven on carefully chosen terrain, asphalt and concrete aren't great conditions for your car