What Causes Speed Wobble?
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- Опубликовано: 8 май 2013
- They say that all foxes are slightly allergic to linoleum, But its cool to the paw, see?
For a more clear description of how the board wants to fall into a turn, check out my video 'Return to Center'.
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When I’m just cruising yk, summer breeze in my face, and then my board starts to wobble, every content bone in my body turns to pure FEAR
Same
yo I just saw this comment on another video lol
@@katieshore same
@@katieshore same
@@noahwidmer5933 I broke my collar bone and have a metal plate in there now :/
I still have scars on my body from 43 years ago speed wobbles.
Same
I crashed going around 40 and broke my thumb, I got a big ass scar on my side
Nad you got 43likes
I just bailed cause of a speed wobble LOL i banged up my knees and arm pretty bad
Dude I’m pretty sure I’ve got a piece of rock jus chillin in my shoulder from 10 years ago when I busted ass going down a hill because of speed wobble
I mostly here because I just tried bombing a hill and ended up speed wobbling down almost all the way and died at the end
Same
Rip
Same lol
Same I turned into a driveway and flew into their yard
Same here
weight in back foot = speed wobble
+FunnyVsTV nope. I've ridden a hill with all the weight on my back foot. did u even watch this video???
if youre going full speed it applies if youre going slow then this video does
+_ Justinlbdr _
Actually you do want your weight on the front to fight wobbles. Not exactly sure about the mechanics on that, but its definitely true.
Longboard Technology Yeah, but you still can ride 50 mph with 60% weight on the front, I've done it, some people have said they have too... If you have a stable back foot of course.
yeah it has to do with the placement of your feet i agree
If my trucks were that loose I wouldn't even use that board.
It's just a demo so you can see how the wobble happens without a rider on it
Yup
Loosy goosy
@@isaid2307 A wise man once said that
Well now that we know what causes it, the question becomes....how do we stop it?
There are lots of ways to stop/prevent speed wobble.
The biggest is proper technique, keeping your weight on the front truck, and exercising balance & control.
You can also introduce a stable rear by de-wedging your back truck around 7-10 degrees.
A proper board helps too. One that is stiff, especially torsionally will help you stay in control.
Tip of the iceberg there.
Bennie C The biggest thing is just tighten your truck
+adoublej okay You need loose trucks to have good control in slides. Even at speed the trucks remain fairly loose. If you're feeling ballsy, dive into a turn and slowly shift your weight towards the back. Speed wobbles instantly, if you can hold it tho and bring your weight back over the front trucks, they stop. It feels unnatural, but it works every time.
Well make sure that you are standing closer to the front of the board than the back, i personally always keep the outer edge of my front foot lined up with the "bottom" screws on the track (the screws closer to yourself), and one very important part is that the back trucks should not be looser than the front ones, you can even make them even a bit tighter than the front ones as long as they arent looser. But the most important part of all is to practice and gain confidence in yourself, a helmet and gloves will make you feel safer and therefore more confident. The moment you get scared or lose your self confidence youll start to wobble.
Or just tighten your board
As this video has gotten more and more popular, I've decided I don't like it all that much, and made too many dumb little mistakes, and I've decided I really should re-do it.
I just want to give an opportunity for those reading this to give feedback on what might help make this video a bit better, without making it something I can't do in an afternoon.
+Longboard Technology Can you explain the effects of "x" towards auto-correction chracteristics: e.g. cycle frequency, etc.
1. the difference between a raked hanger and a non-raked hanger
2. the difference between high-degree and low-degree baseplates
note: if you could explain theoretically first on a whiteboard or something, and then follow up with footage, that would be nice too!
Keep up the good work!!!
Re-posting this here so I remember it later. Originally from silverfish.
So the fundemental problem behind all of this is the fact that the longboarding system is an inverted pendulum. You have a platform which can move side to side on the road ( as you turn ) but you have all of the weight of the system up top. This means that when a change in direction is initiated, the board can move faster than the mass up top, which lags behind.
Because the turning mechanism for longboarding is lean to steer, what happens when board, and the mass above it are not aligned is a change in direction.
When you're are rocketing down the road really fast, imperfections in the road are able to influence the turning system. A little bump can cause the board to jolt a little bit to the left or right just a tiny amount. The result of this is the situation where weight is not aligned with the board, so the weight of the rider the board to go into a turn. Lets say the board jolted a bit to the right, the riders weight is still where it originally was, left of the new position of the deck. Which means the board is now leaning left, and turning left.
So the board went right initially, but now its going left, all pretty much automatically.
Two things can happen here. Either the board can stop turning left once its underneath the weight of the rider which will put the boardgoing straight again, or it can keep going left.
Which of these two things happens depends on a lot of factors, the rider most significant among them.
If there is very little energy going on, its easy for the board to just stop turning once it reaches center again.
If there is a lot of resistance to turning going on, you're going to need more energy to make stopping at center more difficult.
If the board does keep moving left, past the center of gravity of the rider, you now have a situation that is identical but mirrored to where we started with the board on the right of the riders weight. The board on its on accord, because of the riders weight and the inverted pendulum will respond by turning right, and the cycle continues.
By having very soft bushings, you'll have a setup that becomes very easily influenced by misalignment of weight.
By having harder bushings, you'll have a setup that is more resistant to influence by misalignment of weight.
Rider skill and form comes in to play by being able to prevent any misalignment of weight in the first place.
+Longboard Technology yo so i´ve got a hypothese :
Put a wheel on a Stick (or sth ) and turn it fast . Then turn the stick on one side up and down (That´s the turn that happens with your hangar if you lean on your heal or on your toe )
. as u will notice, centripedal energy tries to push the wheel outside.
My theory is , taht this effect doesn´t cause speed wobbles, but if they appear, this effect makes them stronger .
sry for my proffesional english I am not a native and i´ve tried my best
+Longboard Technology I'd love to see a re-make of this, and under the same test what it would look like if you placed a weight on the deck, then moved it forward and backwards what the result would look like.
show how to fix it
Tried going down a big hill for my first time on my new longboard yesterday and got speed wobbles but luckily I bailed off before I picked up too much speed. Ended up with a scraped up hand, badly scraped up knee, hit my head, and hurt my foot to the point I couldn't walk last night and limping today... Good times!
Same! But instead, I didn't bail out and the speed wobble launched my longboard to the side
Man, I just did that the other day! Scraped hand, bumped knee, bit of a headache, but walked it off. Learned real quick that I could use gloves and kneepads lol
@@Enderdragon91dont forgot the helmet😂☠️
And i scrape badly my elbow soo should have some pads for this too!
@@donovanpaquet7174 i fucking ripped my side open kek
Those are very lose trucks
No shit :D
zach feinstein Why are you calling the trucks losers? I can bet they're 2x as more successful in life as your very person.
Arno Dorian HAHAH thks
Amdíredhel is that supposed to be funny. Ur one of those people who make stupid jokes
That’s why I jump off right as I realize I’m going to start speed wobbling, I ain’t risking nothing.
Did that yesterday once I realized I was picking up too much speed and getting speed wobbles. Still ended up pretty scraped up in different places but came out much better than I would... Gear will be a rule for me from now on when going down hills.
B F literally exactly what just happened to me
I drank a couple beers and smoked a bowl with a friend before i tried longboarding for the first time, it was a downward slope but not steep, i felt like i was going 40mph but in reality I doubt it was faster than 20. Anyway, im a heavy guy, speed wobbles ensue, headed right for the curb of someones house which would've sent me flying through their front window so i wanted to jump off and barrel roll but im not cool or athletic enough so instead i pretty much just stepped off the board, and slammed the pavement on my back, i was really lucky I didnt crack my head open from whipping it backwards. Because of the adrenaline, I immediately tried to stand up, and my right leg just didnt work, it was like a lifeless limb... i fell back down, and then the pain overcame me. Holy shit the pain. I broke my leg, it was a tibial plateau fracture to be specific. The doctor said it looked like "a bomb went off" when he was talking about what the inside of my leg behind the knee (where he went in to do the surgery) looked like, little pieces of bone all over. I have two titanium (i think they said they were titanium) metal plates and these big creepy screws in my leg now, and a cool super power to predict when its about to rain, like today. Fuck me its gonna be a pain when im old. Nothing helped with the pain. They gave me morphine when i arrived, and a few more times but i was currently on a medication that blocked the effects of painkillers, it instead sent me into precipitated withdrawel, good times. The doctors didnt understand, this was during the time the florida pill mills were all over the news, the start of the opioid epidemic pretty much. I explained to a doc what one of the main pills that was being abused by addicts like former me looked like, hint: blue. He had no idea this was going on. I could only take advil as i transitioned from wheelchair to crutches to physical therapy etc. Im an ex opioid addict. It's a pretty rad scar to this day.
This can be correlated to a physics problem. Specifically, a simple harmonic motion problem. The bushings (or grommet pads) function as an elastic object. For simplification purposes, let's say a spring. Once that "spring" is compressed from making a turn, potential energy is stored in the bushing. According to Hooke's Law, that bushing is pushing back on the truck hanger with a force equal to -kx (Hooke's Law states that force equals the spring constant times the compression distance of the spring). Naturally, springs are only stationary at their equilibrium position. Once some compression is introduced (typically in the form of elastic potential energy), the spring with begin to oscillate according to the function: x(t)=A*cos(wt+phi) This oscillation is otherwise known as getting speed wobbles. The board itself follows a sinusoidal path. Gnarly, right?
+Maxwell Lohss Hey There!
First of all thank you for your comment, i felt that the video and others comments like "Duhhh, it'z becoz the back truck / Traction / Wheels or anything" weren't helping much with the question "What Causes Speed Wobbles"
I believe the problem to be a little more complex, although i am really not into math, i couldn't really understand the formulas.
On the other hand, a quick search and your whole explanation were enough to convince me that it is indeed due to physics of elasticity of the bushes. (if i'm not mistaking)
Could you elaborate more in a way i could understand why the spring would oscillate (didn't really got Hooke's law).
Also what would then be the "real life" solution or factor to this ? Bushes ? Wheels ? Positionning ? Speed ?
Thanks for anyone who read and replies !
+Rémy Guyonnet +Maxwell Lohss The explanation is sound but there is another factor that also encourages this effect.
Twitches or small movements set off the wobble with a single movement to either the left or the right(for this example lets say to the left), This causes the board to move left so is now positioned slightly to the left underneath the rider(as the riders knees and ankle joints allow for the board to move without also moving the central mass of the rider), the weight of the rider over the right-hand board rail would then cause the board to move to the right aaand the cycle repeats. This combines with the SHM described by Maxwell and the wobbles get worse.
Without a complete redesign of trucks there is no way to fully eliminate or remove wobbles BUT there are methods to stop them before they cause you to crash.
First of all it is best to ride with your weight over your front truck as this is mostly where your turn comes from, it also dampens the restoring force a little meaning that when your trucks are wobbling the oscillation will be slower and you will be able to hold more control, remember that your front foot should be pretty close to flat over the front truck so if your foot is stationary then the truck will be too.
Second, if you are in a speed wobble it is a good idea to try to force a carve in one direction, this gets your body weight solidly over one rail of the board meaning it cant really move back and forth underneath you.
Thirdly its good to keep low and steady when the speed wobbles initiate, standing taller can move your centre of mass higher making you more unstable which is not good when you want to be keeping your front foot steady and strong.
When watching videos you will see even pros still get speed wobbles but they deal with them and effectively so when you are watching they just look like tiny twitches.
+Maxwell Lohss Thats why you need to "lock in" to prevent speed wobble. You keep your front calf tight like some sort of isometric exercise to prevent the board from entering into a nonstable harmonic state. Once it starts to oscillate, recovery is slim (as noted above you there are ways to recover, but it doesn't always happen). There are some interesting Fourier series relationships to carving and pumping that are quite interesting, but you could also think of those as sinusodal phase relationships that determine if you slow down, or speed up while carving.
best video showing speed wobble ever!!! the visual of the board being pushed and going right into a wobble is a perfect demonstration.
If my board is chipped, does it have a better chance of wobbling? I just faceplanted into the road today
I see what you're saying, but no truck setup is going to return to center if you have your body weight on one side which is why it's always important to balance. The more return to center the truck has naturally though, then the more stable you will be because the zone in which your weight will be returned to center is wider. If that makes sense.
This is a good demo. It's an oscillation that occurs because of negative feedback. You set the trucks to turn right, fine; at speed, however, there's a *centrifugal force that makes the board want to lean the other way: left. ( This process repeats over an over and you have oscillation, as long as energy is present. The wobble happens at speed, down hill because you keep getting more kinetic energy.
You need to dampen the oscillation with better bushes (oil-damped perhaps like car suspension (inventors take note)) or by being a better rider.
It's true that trying to actively compensate for speed wobbles could make the problem worse; mistimed compensation could reinforce the oscillation and I think it may cause the wobble to increase in frequency. So it can be better to just let the wobble happen instead of trying to fight it. As you all saw, the board will still travel forward even if it is wobbling.
Great video man. So I got a chance to talk to Kyle Wester about 3 years ago. I didn't even know he was a long boarder but through conversation I learned that he was a professional and attempting to set the world speed record on a skateboard. After he showed me the video of him doing like 80mph, I asked him, "How do you not get speed wobble?" He told me speed wobble is all in your head and it's the speed that your brain tells you to stop committing. It was kind of a revelation and I told myself that going into the next hill. But of course I think it's also a matter of underdeveloped stabilizer muscles. To see a clip of what I mean by that just look up first time slacklining.
This makes zero sense, i got speed wobbles sitting on a board. Explain that
@@mikem5475 Bro, quite skipping leg day. The board knows when you skip leg day and will send wobbles to the whole body. Unfortunately there’s no other way to avoid it. SCIENCE! 🙌
@@peterweth hahaha
So when it stabilized it self, can i just letting go the speed wobbling and waiting and riding it till it ends it self?
Speed wobble is caused by a number of different things. The best way to avoid it is to place your feet more parallel with the board, and pointing in the direction you are traveling. Instead of perpendicular and pushing on either edge of the board.
What kind of wheels do you hove on your skateboard
I had my first speedwobble ever earlier, I started skating almost a month ago and my brother helps me. I was going down hill for the first time and I went from the top, I got a speedwobble and I did not know what to do so I went towards the grass but by that time I had stopped wobbling and I was still on
Not a lot u can do the first time, just have to learn from it and take the pain. I was third time lucky.
I had my first 3 dayz ago on a penny board going 35 mph
lol i longboarded yesterday ( brand new sector 9 moonlight maverick board ) , was going down the riverbed for the first time , speed wobbled , i bailed too late and ended up hitting my forehead ( scraped it , my forehead is swollen ) , scraped my elbow , and knee lol i ended up chipping my front tooth as well but ill be getting that done soon ; know when to bail and .. wear a helmet LMAO totally worth it though 😂
samantha v helmets are you best friend and padding. After all my accidents, nails that have scrapped off, head injuries, f trying to look cool. Lol. I tried to bail while on my pintail and def didn’t turn out well. Ended up hittin the back of my head on the dirt road and gashes everywhere. But hey, that’s the life lol. Spread the stoke 😂
On your rear truck, lower the degree of the base plate and run two high-durometer barrel bushings with cupped washers. It will reduce your ability to carve but make you're board more stable at higher speeds.
I’m pretty sure the ONLY reason I haven’t had a bad fall in my board yet is the fact I say out loud to myself “big ball time homie “ before every big drop and I can’t let myself down haha
well speed wobbles are caused by the board constantly correcting itself like you said. best way to avoid speed wobble is to tighten your front truck depending on the kingpin angle. to stop speed wobble. just keep your weight more on the nose and keep low
I’m convinced skaters have a better understanding of physics than most engineers.
I just started long boarding and got some wobble on a small hill. Seems to me in a perfect world, the trucks would never wobble. Once you introduce imperfections in the road, the trucks/wheels will react.
Seems like the “inner wheel” gets dragged backwards then it bounces off the end stop of the truck, goes past center and the new “inner wheel” is dragged backwards and the cycle continues. Doesn’t happen at low speeds because there is too much resistance for the road to turn the truck. Resistance to turning decreases as speed increases. This is because the wheel is allowed to roll as it turns. You can experience this in your car: with no power steering, turning at a stop is very difficult because you have to overcome the friction between the tire and the road.
So, how do you increase resistance to turning? You must increase the friction between the wheel and the road. As others have stated, that can easily be done by applying more weight to the front truck. Why the front truck? Because it is the leading truck and primary steering component. The rear truck essentially follows where the front truck take it. The less weight on the front truck (and the board in general), the more prone to wobble. You can see how slow this board is going and yet it has a great deal of wobble because it has no rider.
Thanks for the video and everyone for the helpful comments that helped me gain understanding.
Is there a way to eliminate speed wobbles with like a certain type of truck?
Great mental notes man!
Thanks LT.
What trucks do you use
U guys are some kind of mad board scientists I love it
That was very informative, it really helps to see why op trucks have a better, more stable design. That was extremely enlightening,
To stop speed wobbles you have to change your back bushing to a way stiffer compound to match your weight all long boarders have this on their boards..
So that boards cut for brakes?
After my epic fail today I think weight distribution from front to back has a lot to do with it... well that; plus panic and center of gravity.... Fuck my knees hurt lmao. my question is can you correct it with confidence and lead and front foot weight management alone or is it more complicated than that? what is the proper weight distribution in the front and rear on a longboard when going downhill at speed?
lead and rear foot weight management**
The correct weight distribution is 90% of the weight in the front, and you have to tight your trucks if you're going fast. And, a combination of 2 barrel bushings for each truck is important too. But, don't put the 100% of the weight in the front because you will loose the control of the back side of the long and you will fall. It's all about balance (and have very tight your trucks). ;)
It's my personal experience, and if yo do that, but if you loose the control and speed wobbles start to fuck you, i recommend this : put almost all the weight in the front and grab your long with the two hands until you regain control. I hope I have helped.
Could you repeat this experiment with a 45/20 split setup?
Why did you mount the trucks on the bottom on a drop through board. I'm a newb and I understand thats a nono
So what can I do to lower the chances of a wobble? Besides being better at long boarding ..
one thing i noticed is that if you stay in the middle of the balance youll get wobbles easier, so by turning very slightly to right or left could help it stay more steady, if you have snowboarded you would know this.
Also tighter trucks/more resistant bushings.
gradually carve side to side but you want to match your carves with your speed so if your going fast don't carve sharp side to side carve really easy
If you turn on the inside of a curve you'll go faster vs if you take a wade turn angle.
The board leans in either direction, the wheels will make a circle that you can imagine around the board. As the board moves that circle/turn wants to get smaller and smaller untill it can't anymore, thus pinching the trucks at a full turn/or max radius untill the trucks bounce back from the momentum.
Its just like carving, it's just it happens for you because the higher speed, or less resistance at the king pin, either or both.
How far you lean on either truck absolutely plays into this. It's like when a person loads a trailer attached to a truck, you Should have most of the heavy things close to the truck to prevent tail whip/wobble. That's at least a clue to getting a physics level of an answer.
And the reason y the board auto corrects itself is because the rear trucks turn, they literally stear in the rear as well as the front. Tryung different 2 solve it but still it isnt for every variation of skate/longboarding. The best way to limit speed wobbles is only if u have a hill bombing setup with tighter bushings on and on a longboard truck and put a base plate at 30 degrees or lower limiting the turn radius, that lowers the center of gravity. But still i wish there was a way to limit speed wobbles from freestyle setups cause u wanna have loose bushings and base plates about 45 degrees or higher. And u cant just stop the rear trucks from tearing cause that helps with recovery when u carve, slide, and do majority of the slalom dance moves, cross steps and such
great video
got my first speed wobble today, i was a bit lucky because i did a parkour roll thing instead of just hitting the ground and stopping
Same... Ended up pretty scraped up still but not nearly as bad as it could have been.
I already have, Imagine that.
I do anticipate some... Interesting discussion.
But I've got plenty more up my sleeves.
When im going straight down a hill i speedwobble, so i agree with you in saying that it isn't caused by over-steering.
Its caused by you not purposefully giving the trucks something to do by steering
OPs are also some of the best trucks out there. :)
Today I had that on my longboard, I figured out that (just all irl motorcycle) if you let it wobble it’ll fix it self. Not adding any break, not trynna counter it. If any, I just went for a settle snake type and shifted my wait a little backwards, until I managed to go straight.
Idk why, but I was going on a very steep downhill, and I'm basically a beginner. I was like "Ok, this is very crazy, but I'll go for it" And the hill is very smooth, so you can go even faster on a longboard. So I'm going down, I was going extremely fast, everything is fine, my friends are watching me. And I felt a wobble, my very first speed wobble. I got so scared, and the hill wasn't going to end soon, and my longboard is just wobbling harder and faster, so I stiff my calves. The wobbling actually calmed down after that. So I search up "How to stop the speed wobbling" And it kept saying things like "Tighten your trucks, loosen your trucks, etc" So in my opinion, tighten your trucks, and if you start speed wobbling, tighten your legs, or calves.
Put more Weight on front foot, search up longboard tuck
had my first serious crash yesterday because of the speed wobble how fun, i have road rash on my face arms and ended up with a concussion love that
𝘴𝘪𝘦𝘳𝘳𝘢 I had my first crash too, just two weeks ago. My left hand had gotten a slash and my right knee basically got a hole an inch and a half deep. I’m barely able to run,but man,am I going to spend time to learn how to stop speed wobble
Risky Frisky totally hear you man, the same night i crashed i searched up so many videos on controlling speed wobble haha, took me a few days but hopped right back on its scary to get back on but it’s so worth it!
𝘴𝘪𝘦𝘳𝘳𝘢 yes for real. I honestly can’t wait to get back on
Got my first one yesterday...
So if you tighten your trucks you are less likely to speed wobble?
Yes, if you tighten the trucks you increase the force needed to change the direction of the deck.
With really stiff bushings, a rider can push themselves back over the center of the deck without hardly causing the deck to turn at all.
+Longboard Technology ok, cool! Thanks! So a double bushing long board would probably be bad for bombing hills... Haha, good to know :) thank you once again
interesting. also, the four wheels act like gyroscopes that resist change in momentum. I don't know how that affects it because I'm not a scientist but I'm sure it has something to do with something. They figured out how to make the segway, I'm sure someone can come up with a device to counteract speed wobbles.
I think it's because there's a solid axel. Solid axels get upset and freak out/try to reach an equilibrium even on the seemingly flattest of surfaces.
last school year i fell on my first day of spring break and had to wear a brace the entire spring break.
I experienced my first speed wobble yesterday and it wasn't pretty at all went down a garage ramp going about 27 mph and I amount hit a car and the left lane but I had enough control to turn a Little right so I hit the cone and fell off I broke my new iphone 11 pro max with the case and my watch face was destroyed and a pretty bad right arm scrape wish I knew about this early think God it wasn't my life tho
Ok but what I wanna know is what to do when this happens?
Start steering, basically. The trucks start to wobble cos they have no work to do. Skate in a big 's' to control your speed. Learn to footbrake also
Thank you
Great! Speed wobble is one of the mysteries of the universe that we're never going to figure out!
I put to you:
When the trucks are ridden AS THEY ARE DESIGNED, the bottom bushings force the hanger back to centre. The bushings supply an excess of this force meaning that they are actively counteracting that "natural" wobble you are showing.
Now when you add a human to it, that's where the wobble can start. If humans were as perfect as a bushing and supplied perfectly symmetrical force to the trucks, the wobble could not occur and the bushings would not cause it either.
Thoughts?
does anyone know where i can get a drop through drop down longboard deck with a handle?
Mekhi Terry why the hell do you want a "handle"? just grab the damn thing its noy gonna bite you.
Fried Chicken it looks cool lol. plus, it's easier to slide. I may just end up making a custom deck since I haven't been able to find one. Or i may just cut a handle into one i find.
Mekhi Terry no. I recommend getting anything with rails. If not, just screw in your own rails. A handle would be dumb and just weigh you down.
I mean a cut out in the board. Like on the side
Yeah exactpy. A handle would serve no purpose. Slide rails are better for, well, sliding.
giving more weight infront was actually controlling it.. the front trucks was first to absorb the stress, which causes movement specially on high speeds. that's the reason why you put greater force infront. since it would be easier to steer your front truck than the rear one.
Alot of it comes from back truck too, if keep weight on front truck, it will help.
Would be cool if you tested angle risers
The phenomenon is similar to when a car or motorcycle "fishtails" at high speeds.
Anyone noticed that he does not have a bottom bushing on the truck?
After watching your video, there are a few things i would like to point out to you. First and foremost the board is not the cause of the wobbling it is the rider. If you take a longboard or skateboard to a hill and let it roll down under its own inertia it wont wobble; it might smash into a curb or a car at the bottom but it wont be wobbling. The rider must have strong legs to keep the board from wobbling, this can be achieved thru putting more weight over the front truck with a speed tuck and tightening your thigh muscles. Your legs are your suspension use them well.
"If you take a longboard or skateboard to a hill and let it roll down under its own inertia it wont wobble"
Except thats exactly what I show happening in this video.
+Longboard Technology you dont show that at all in the video. you simply pushed your board on a flat surface and talked how the board was attempting to right its self but you didnt mention anything about the rider or a speed tuck where to concentrate your weight.
To add, the OP didnt let it 'roll under its own inertia' per se, he initiated that wobble by pushing on the right side of the board. The vibration will not occur if you let the board roll by itself...it will occur when an external force is applied to it.
Im studying mech engineering who skates in his spare time, so been googling around for how speed wobble or 'lateral vibration theory' works..
I agree with Nate as your bent legs do act as a suspension since its like a kind of spring 'absorbing' that vibrational energy
"The vibration will not occur if you let the board roll by itself...it will occur when an external force is applied to it. "
Just the bumps and imperfections in the road are enough to propagate speed wobbles with a similar setup, if I were to figure out a way to send it down a long enough hill without it drifting off to the side first.
The video is a demonstration, not a proof. And kicking it with it already imitated into a turn is much the simplest way to film it.
Take a balanced weight equal to an average riders body, put it on a board with normal trucks and let it go down a hill to pick up some speed, how to stop it is up to you. If it doesn't wobble it proves that low and balanced weight is the key, if it still wobbles you can try tight and loose trucks to see if that affects it but you still have somewhat evidence that its not only the rider causing the wobbles.
I dont understand tho. If speed wobble is caused by the board try to correct itself, what causes it to try to correct itself in the first place? something must have happened before the speed wobble that causes it wants to correct itself.
Well, basically just normal inconsistencies in the road and the fact that you're not always going to remain perfectly balanced means that at some point the self correcting mechanism is going to kick in and do its thing.
It could just be a pebble or a crack, or if you're going fast enough the road vibration itself.
It was always my understanding that speed wobble was the product of the rear wheels steering the front wheels rather than the other way around giving a wobble to the board. To combat this you would ride a stiffer set up in the back wheels. I guess in theory you could ride super loose in the front and stiff in the back and not speed wobble but your turns would be really twitchy. In this video to illustrate the speed wobble he has both trucks set up super loose, my guess is that if the back trucks were set up much tighter but the front trucks were left super loose the speed wobble he is trying to show would not exist. The board would however turn to one side but not back and forth as the trucks in the front would still be loose.
I've done another test where I put on 2 loose trucks, but one with a more stable geometry than the other, and the results were that if the stable truck was in the front it basically wasn't any more stable at all than having 2 unstable trucks, where as if the stable truck was in the rear, it wasn't any less stable than having 2 stable trucks.
It was my conclusion that the stability characteristics are inherited from the rear trucks, where the turning characteristics are largely a product of the front truck.
If you want to watch the video where I was messing with that, ruclips.net/video/1KC-RcVvuDE/видео.html
I love you people.
Damn near died on my skateboard today on a huge hill, thanks for the info
interesante teoria
you need to tighten your trucks dude
He loosened them for the demonstration dummy
Wouldn't you want to tighten the trucks more? I've never seen them that loose.
Either your support pin bumper is toast or you are using the wrong bushings. Those are way too loose. Also check your pivot cup. The truth is speed wobble is a vibration in the pivot cup, but the bushings bounce doesn't let the vibration escape from the truck wheel combination. Tighten your trucks and stay low.
The cause of wobbles is oversteering on the rear truck due to poor weight distribution. For example you won't get speed wobble on low degree rear trucks, because they're not really turning. on LDP setups you usually ride up to 65° fronts and down to 0° rear trucks and these setups are totally safe to downhill
Speed wobble happens because when you are moving at a very high rate of speed the slightest change in balance from right to left will have a very extreme affect and then you die.
lol I face planted off a skateboard after it started wobbling, I have an infected cut and my jaw hurts.
So it's not all just in my "mind"? And will harder bushings counter this ?
toXic viRus01
Yes, but not as much as practicing good form, and developing strength and coordination.
You can also de-wedge your rear truck for a lot of extra stability as well.
okay , thanks a lot
hard bushings will not help speed wobble. hard bushings will cause you to just fall off your board when you lean. don't believe me, try it. I ran a 92a eliminator bs and a 87a barrel rs in cal50's, and when I went to lean, the board kept wanting to stay straight and I had to jump off. good thing I wasn't going fast.
DJ Slizzy Slick hard bushings just need more weight to steer the same amount, if your too light, of course it will stay straight; still, if you dont want to do hard corners and stay more stable on bigger turns or straight roads, hard ones will make your life easy
Yes and no, depends on you, I use Venom SHR and and they if your not use to them they can throw you
I was doing speed wobbling in an old Mk1 Zephyr car with .308 V8 not what it waa designed for my understanding there was nothing wrong with the suspension. 🤔
it doesnt want to go straight
So what do you do? Ride it out?
That, or do a slide.
For riding it out, you really just need to get your weight on the front trucks and you mostly ride through anything unless its already too late.
Sliding is probably the better option a lot of the time, one of the things that can lead to wobbles in the first place is lack of control of the situation.
If you were to bolt a pole sticking up vertically to a deck, and attach 150lbs at the position of a riders center of gravity, it would not apply perfect symmetrical force to the trucks, and the bushings would not have enough corrective force to hold it up perfectly.
It would cause the board to lean, which will cause the board to turn, which will cause the board to auto-correct, which will cause the board to turn the opposite direction, and then very shortly you would have wobbles just the same.
those shoes are fire!1!1!
Because of those damn wobbles both of my buttcheeks are scraped up and my knee as well. Now I can’t sit anywhere for the next couple of days.. FML
barrel bushings and tighter trucks no speed wobbles
Well shit i already fucked up my jacket and hands.
poor loaded tan tien
Why? It's the ronin trucks without bushings, not the tan tien.
Liam Demp omg I cry for them both no bushings board side blocks screwed into a 200$ craving machine it's a crying shame all around
I guess the how to deal with em is just let the wobble happen and dont force turn to correct it. Just go with it until it fixes itself
no worries set I gave have road rash
oh thanks
I always felt like speed wobble was from getting nervous
Just had a speed wobble and bailed, got road rash on my knees and elbows. Shit sucks lol
Same here yesterday... On top of what you said I hurt my foot and hit my head.
@@bf9396 damn bro gotta be careful. I havent tried bombing any hills recently because of how bad I got hurt haha
What causes speed wobble? Your board does??
I always thought the faster you go the tighter you want your trucks
Like 2 days ago i ate the f street like ma jaw got f roasted and so are my elbows and knees
oof
Is it speed wobbles or is my legs shaking in fear?!
Why not both?
Had my first speed wobble on a penny board
Yikes
What kind of skatboard do u have 😂😂 mine doesnt woble😂
Probably because your trucks are tight
+Jacob Newman yea but those ar freeking loose
L
+Justin Diaz no shit. that's the first thing he points out.
that poor loaded...
and?
"People say"...... I am the world's best boss. 0:40
No dude you get speed wobbles cause you back truck starts to turn and it pushes your front trucks around that's why I ride a lower degree base play in the back with harder bushings and a normal setup in the front
Just crashed a couple days ago when I was bombing a pretty fucking sweet hill. Near the end, I guess I went too fast and the wobbles threw me off the board and now I got a Colles' Fracture. Had to get a splint and pins in my wrist and now I can't play Fps games or any computer games without my mouse hand for like 2 months. :((( **It took me like 5 mins typing this at prob 20 wpm when i have an average of 80 with both of my hands btw** :((((((((((((((
Yeah like I've ate shit before, your enjoying everything and then you feel that first little wobble that you know you didn't do, and then you say "oh fuck here it goes.." And yeah