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I Built a Split wheel Motorcycle, But will it work?
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- 게시일 2023. 02. 03.
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Hey guys, just wanted to say that the reason for the bouncing up and down is due to the change in leverage. Since one of the wheels is further back it has more mechanical advantage over the suspension due to the increased distance of the swingarm
The reason why it is bouncing up and down because it's clearly not cut right. Whoever measured the diameter was way off
its also down to the fact the tyre is compressing too much cos there's no air in it, so when the rear most tyre hits the ground it with no weight on it the tyre is a normal shape so theres at least an inch of difference in height as the front most wheel is flat cos its carrying the weight of the rider, hence the bobbing up and down
no, it"s because the rearest one is higher off the ground, because the arm is not leveled! you need to make the arm levelen, and block the suspension, and VOILA! no bumping!
Its not the change in leverage since the swingarm isnt straight. The wheels are parallel to each other to the ground. Its because at the point where the tires end the tire compresses. Both tires compress more at the ends of the tire/wheel which brings the whole bike down. You could improve this by only removing 1/4 of each wheel is 1/2 the wheel.
Agree”
In order to completely reduce that bumpiness. Instead of a suspension use a stiff metal. what its doing is that, when the bike runs on the wheel closer to it, the stress the suspension endure is less, but when it runs on the further wheel, the stress or the weight the suspension carries increases. So, the suspension compresses at different rate when each wheel touches the ground, similar to that torque factor that your learned in 8th grade.
@Alex Gerrits nah that would be too easy 😂
KRclip engineers 🤓
Ya know? I wonder if a single complete wheel would stop the bumpiness.
Little suspension for each wheel
@Heratiki its always fun with a bit of a mental exercise in trying to simulate something in your mind to identify the potential problems before they arise
The nervous laughs as he was testing it out 😂😂😂
Shiting bricks!
Can´t await the Chineese copy...
😂😂😂😂
Instead of cutting the tires where you want them leave a bit more rubber on each end then bend that piece back so the loss of contact with the ground is more gradual. Also suspension to the end would keep it in contact better. Excellent video
Yep, you need to change the suspension geometry so that it has a strut on the back wheel at a minimum. Otherwise, the weight will always be balanced towards the middle wheel, which means there will be a weight shift each time the wheel changes. Cool concept, though!
@Hell_Pike at higher speeds the rubber is expanding and flying off.
Exactly this, and I'm thinking at higher speeds the centurial forces are going to put different leverage on the swing arm, that problem would also be fixed by strutting the back wheel
needs to be placed between both rear wheels otherwise the center of mass will still primarily be on the front of the rear wheels, causing the middle wheel to compress and leading to the same leveraging issue, albeit to a slightly lesser extent. You got the closest out of anyone in the comments i've seen so far though so gw.
You actually could make an independent rear suspension version but it would require redistributing the weight and altering the frame and completely changing the suspension geometry etc.
You guys must be fun 😊 to work with. I like how you come up with your ideas on this bike, it's so freaking outside the box 🎁. I hope you don't change, this world needs more people like you guys. Your like the Nickolai Tesla of the
They got to him 😞
Don't you dare compare these to the genius that IS Nikola Tesla !
You should be ashamed of yourself.
the suspension is engineered for a specific swing arm length, when you transition to the half wheel in the farthest back the swing arm is basically longer and the lever effect on the suspension is greater, so it compresses more and so on.
@Curtis Johnson or maybe anchor the back of the swing arm and leave it anchored at the front too
And that my friends... is Science.
Swingarm extension needs to be able to move independently from swingarm
Well said, came here to say this, but probably would not have been as well said 😁
Thank you for putting my thoughts into words that made sense. I was also thinking the lack of tire under the back of the bike means more weight is supported by the suspension rather than the wheel, enhancing the lever effect.
Just my thoughts are the tire would need to be slightly more than half way in circumference to create a smoother transition from tire to tire. Right now there is a slight gap from the amount removed from the cutting in half portion , you need consider the amount removed from each (even as little as I might be. There still a gap, as well as there is no angle of entrance to help create a smooth transition from tire to tire.
I think you would need to cut 2 tires part the 180deg point for a better blend. Like maybe 190-200 degs. 🤔
And maybe some counter weights???
The design looks like it would be applicable on off road and snow sections if it can switch itself from the street mode. Can't wait to see what future technology we can come up with.
Now that is called reinventing the wheel, of course half circle is unstable when turning high speed, you should put a weight balancer to those half wheels to avoid or even minimize the bumpy ride, don't give up, good luck to you guys, hope one day you might perfect those wheel concept.
I wanna see what would happen if you made it have three wheels beside one another, the outer two being in sync, the others the other way around.
I think it'd be a weird mindfuck to see how the brain would treat something that rapidly swaps between a trike and a bike
I feel like it needs extra heavy suspension on the rear tire and the ability to pivot. Also maybe fold the inner tube in half or thirds and inflate it? Also what if you slightly oversize each tire/rim to a bit more than half then rivet the ends of the tread to the rim so they aren't wide open and they taper down then if you inflate something inside it won't burst out the ends
Hey guys, self appointed B&B R&D Engineer here: I think part of the issue is the transition of one tire to the other. Perhaps in the example videos, their design wasn't a precisely half of a wheel but instead 60% (or something) so that both tires would have larger contact with pavement during transition. Right now with tires being 50% there's only the ends of the tire touching pavement and essentially squishing because there isn't the same distribution of weight as say the centre of the half tire compared to the end of a half tire. So perhaps the solution is to make the tire completely solid somehow so it doesn't squish and create a hop; that or a combination of cutting the wheel at 60%. BUT WAIT, there's more, MAYBE the suspension itself is an added obstacle and simply making it a hard tail like a road bicycle would remove the need to work around the suspension.
I stopped watching at 1:33, came here & read 76 comments to see if anyone mentioned the problem of the constantly alternating effective wheelbase causing trouble during a tight turn. Time to watch it try.
I think you're overcomplicating this. It's just the suspension and the constantly changing leverage point
Yeah, too bad they literally didn't bother to try to figure it out
What your saying and silicone inside the tires! 😅
@Kevin stoneburner incorrect because the idea is to always have only one half facing directly downward
Lots of fun watching you guys! Got my laughs in. Like other's commented, I think 60% tires would be better and maybe some way to make them solid rubber tires.
The pivot point of the arm puts a load on the closer to pivot point wheel. Try lifting the rear about an inch so when you sit on the bike the weight distributes a bit more even on the tires but bumps will still be causing this hop problem
Maybe like a dual axle trailer. An equalizer arm in between the wheels would balance out even through bumps
I’m sure that’ll be another cool idea for another video
Looking forward to more 💪🏼
There is 🅾️ reason this should have worked so well. Looked super cool
“Craig
I think we made
The perfect motorcycle”….. Craig-“yeah it’s almost
Like
Riding a shake weight” I laughed so hard I woke my wife up and got yelled at
I’m here in the comments to distract myself from the exact same situation happening at the same comment!
19:20 Note for why it's bouncing: Due to one wheel being further back and there only being two wheels it has a sorta situation like a lever, especially noteworthy due to the curvature of the earth making it more notable because the closer tire will be higher up, pushing up against the ground.
The earths flat bro, "Curvature" What an amateur
I don't think the curvature of the Earth really matters here
The suspension will compress more when the weight is being suspended on the different axles. It's like holding a weight close to your body and then trying to hold the same weight at arm's length.
The only fix that springs to my mind is to in some way have the 2 rear wheels have independent suspension. That way, you can adjust each to compensate for the differing load.
Yup, hence why it was bouncing up and down
honestly just having a hardtail and making it suspension less makes a lot more sense
The only way to fix it is.........to never ever try this again.
@Daniel Klopp thanks professor. I’ve always pronounced it wrong … thus the source of the spelling error. But you found the flaw!
@LPL_fanboy how is getting the rear of the bike wet going to help??? 😉 The correct term is "damping", NOT "dampening" (dampening is getting something moist; damping is slowing spring compression or rebound). Also, damping has nothing to do with spring rate (i.e. the real source of the problem is a change in the effective rear spring rate as the wheelbase changes).
The suspension is designed to work with the first tire so when it switches to the second one the pressure is further out thus dropping its weight and center off gravity is different
Have you considered adding weight on the other side of each tire to balance it? Right now you have two off-set wheels throwing torque all around and definitely adding to your shake issue.
nah i don't think it works like that. my guess would be because of the suspensions, was reading some comments and saw someone says there were 2 different leverages, i think it's because of the further wheel not being close made the bike and rider heavier rather than the wheel closer thus makes the bike bounce when moving ( does that makes sense? ), it didn't make some bounce action on the bicycle video because it had none.
I don't think the bumpiness is due to the weight change. You have square cuts on each end. Taper the cuts back at an angle and see if that helps. It'll be a smoother transition to the next tire
I think you need to raise the center wheel up a bit and extend the front wheel some to get rid of the bounce motion. The person's weight in the middle is affecting the center tire hitting the ground from the suspension.
Think about leverage and lever length. As others have suggested, you'll need to change the suspension geometry, otherwise every time the weight transfers to the wheel with greater lever length, greater force is applied to the suspension and the swingarm will compress due to the shift in leverage.
I think you guys achieved making a motorcycle feel like you're riding a horse again.
Keep the shenanigans coming! Love y’all!! Never disappoint
The bumpiness is definitely due to the suspension, and if you gonna strengthen it to make the Wheels more stable on the bike's frame so it doesn't bumb that much, you should keep in mind that the 3 wheels HAVE to be aligned in a perfect line, otherwise the half wheels will rotate with different heights from the floor, hammering it every transition between the halfs
I don't actually know much about motorcycle, but i think some, or most have suspension on the front wheel as well, the distortion of the springs can be missaligning the wheels considering that both front and back wheel's height impacts on the tilt of the barr that hold the two half wheels
It's bouncing due to the back back wheel being a little lower than the back wheel. The middle wheel needed to be slightly higher then the very back wheel to compensate for the dip (missing piece) of the wheel.
Instead of strapping the suspension down in the back, you need to install a solid strut to keep all three tires running on a flat plane. With the change in wheel base length, you are changing the leverage that your weight has on the shock, so it changes height with each half rotation of the tires. If you remove the shock motion, you will also remove the up down motion. Just weld in a solid vertical riser on both sides where you had the ratchet straps before. If your riser is too short or too long, you will still have a bumpy ride. If you get it the right length, the ride should smooth out.
For bouncing issue, I think the first shortcut is to try adjusting tire pressures of each half to be different where the combo absorb most bouncing components until certain satisfactory level 😀
May be the front-half should have lesser pressure than the rear-half.
Dahmar ohh yeah, I missed the huge point.. ha hahh..
May be different hardness materials for each will do, but that's not the good shortcut.
Now I look closely again. I think the worst bouncing happen is not on either individual half. The highest point is where the transition; while edges of both half together touch the road. Not sure why it actually happen 🤔
This was amazing! The bumpiness is due to the two wheels exert different leverages on the swingarm due to different distances from the fulcrum (point of rotation). Thus the spring compresses more when the weight of the bike is on the wheel that is farther away from the fulcrum, and less when the weight is on the closer wheel.
It also looked like the angle of the extension arm wasn't parallel to the original section.. it sort of angled down then made a slight turn to become level with the ground. I believe that would mitigate a bit of the springs compression as the extra travel would be compensated by having the arm further down away from the bike..
@AwesomeMcAwesome no, that didn't solve the fulcrum problem it only made the springs absorb and react less. If the wheels were on the same axis; it would fix part of the issue. If they stayed level with each other and used a different suspentsion then 1 wheel wouldn't be lifting the bike as it takes the load.
@Fritsified True that, was late when i was typing. But anyway the forces acting on the swing arm needs to be balanced equal from the both tires. Too early to do kinematics simulation I have not had my coffee yeat.
Repent to Jesus Christ “For the Spirit God gave us does not make us timid, but gives us power, love and self-discipline.”
2 Timothy 1:7 NIV
h
They used tank straps to bypass the suspension, so its not that.
The bump looks to be happening when the wheels swap contact, I’ll bet the bump is from the 2 end cuts being different heights. If you could make the ends of the tires more of a tapered entry instead of a blunt cut that may help with the bumping.
A simple fix would be to angle the new bar attaching the second tire slightly towards the ground. Thus the increase force created by the longer swing arm when the second tire hits is counter acted with reduced height from the pavement. Would need to be angled differently for each people of differing weights.
Great video. Hope my explanation made sense. Though I'm sure someone has already mentioned it and better, in the 6k plus comments!
DC
I believe this would have been better to have a hard tail suspension on the rear. The leverage the second wheel has is much greater, therefore the bike wants to squat a little more while the second tire is touching ground. Then of course pops back up with the original tire touching the ground. I bet it's a ton better with rigid rear suspension. Let me know when you throw another 5-10 grand of your time at my suggestion. lol
Wow! What amazed me the most was how you guys stayed kool and had fun through all the innovation!
You mentioned wheelbase will constantly be changing, well there's the problem when you consider leverage. The swingarm is essentially a lever on the shock, so when you increase the length of the lever you change the amount of force on the spring. I bet if it was rigid (no shock) then it would ride "smooth" at least on a nice surface.
You get more leverage to compress the spring when it's riding on the rear wheel, kinda like when you're closing pliers, then it's easier to do when you're clamping on the end of the handle.
You could get rid of most of it by simply just riding without a spring and welding the whole thing so it doesn't have any suspension travel, or you could stiffen the spring.
Also, as another commenter said, you should have 55-60% of the tire left, so you get a smoother transition.
That's exactly what I am thinking too.
@DeepCarrot 6859 The 55% was just to get a smoother transition in general and not for the spring compression thing
100% correct, torque is a matter of force multiplied by distance, the further away the centre of the wheel is from the spring (rear-rear wheel is further than rear-front wheel) it will increase the amount of torque the being applying to the shock mount, therefor compressing the spring more on the rear wheel causing that bump effect.
the only way to completely eliminate this effect is by not cutting the wheels in half (no point in the video), welding/removing the shock (resulting in a bad ride) or have a hydraulic spring, changing the compression force to suit the torque each wheel is producing to the spring (extremely complicated - if its even possible)
if you were to have 55-60% of the wheel, it will make the torque transition smoother (correct again) but it will still have the same peak applied torque when there is just 1 wheel on the ground, which will only be noticeable at low speeds. at higher speeds, the slight extra length in circumference will become negligible
spot on man. I was thinking you put it on a chopper since they don't have suspension usually anyways. I didn't think of the 55-60% of the tire left, but that would probably help a lot too
I love this stuff, thanks for making all of this content. I don't have a bike but I really really want one. Keep up all the things you are doing and ignore the critics! Thank you.
My father asked me what I'm watching and after showing him the thumbnail he said "Why in the hell would they do that to a functioning bike?" I laughed and replied because they are making entertaining content?😂.... that's the honestly best and only answer I could come up with.
If you actually wanted that to work, you could mount the drive sprocket between the 2 wheel halves. Would require a lot more framing, of course. That would greatly reduce the leverage arm offset.
Love the video. Really appreciate the moment of Faith, we need more of this in America, and on KRclip.
here is an idea about how to solve bumping issue. There are two issues that I noticed. Leverage diffrence between both parts of the wheel and no overlapping.
First you need to extend the swing arm furher but do not change distance between both parts of the back wheel, move the front part of the back wheel further back instead that way leverage diffrence between two parts of the wheel relative to front one will be significantly less.
Then instead of cutting the wheels in half and having 1 whole wheel in total you'll need to cut out only 45% of the wheel so you can have two 55% wheel and one 110% of a wheel in total. That way having something extra on each half of the wheel you'll elimininate the possibility of that back wheel losing ground contact ever. even a split second loss of ground contact will result in significant bumping issue.
Yeah if anything was deserving of the "do not try at home" title this is definitely a winner! (It's much more fun to do it at work anyways ;) ) Didn't expect it to be able to start galloping like a horse LOL
@The Vibe Been there, done similar! Can totally relate!
@Joris Suffuhrt Answer, why not? Lol I'm still laughing 10 minutes after watching! This was hilarious 😂
@Shattering The Glass Ceiling well, you'd think that's the stupidest thing in the world but today i'll have you know i scraped the ice off my gixxer thaw 2001. it was all good till i hit second and it suzuki'd all over the street.
Biker and bread do have drilling lubricant
It doesn't overheat
Just 1 q. Why?
I am 23 years old, have been on the internet since i was 8 - 10, throughout this time there have been very few occasions where i watched a full video.. Watching more than one video of the same channel ? Even fewer, this is the first channel in ages that i can't help but watch more of its content, THATS HOW FUCKIN GOOD YOU GUYS ARE
Since the bicycle, I've been thinking that each wheel half looks like a long foot...
You know where I'm going with this. Let's have 8-12 wheels each with a shoe, synchronized to either step from front to rear, or from rear to front, tried both ways 😁
Love these types of videos. Would the ride be more comfortable if the second chain was under more tension?
Nicely done. This was a fun video to watch. Nice quote out of James and a nice touch. The "KTM" vacuum comment was the funniest thing I've heard this year. I'm totally gonna steal that...make some stencils and spray my shop vacs with the Dodge logo: if they work, they suck. God bless.
Absolutely incredible. Outstanding work.
That's a pretty genius horse simulator you've made there. Gotta dress it up to look like a mini horse. Hilarious.
and to think you only needed a quarter outside kmart until now! lol
You folks are awesome! Amazing craftsmanship
I wonder how would the ride be with the two rear tires intact? It would look pretty cool.
"we basically have a 50% chance of it working"
Yeah I think that was the 50% you cut off Craig 😁🤣
Thats awesome, try to put the back wheel at a slight down angle to help even the weight transfer more evenly
I would say the rough ride is due to the increase in leverage every Time the wheel base increases. So you need to lock the suspension out.
This man's actually going for a world record first!
Without Guinness!
@Mark holroyde They'll certify anything if you're the first to do it, and you pay them enough money
Need more than Guinness to get me on that for real...
I like the galloping! Try using 60-75% tires and mount the rear tire lower on the swing arm to fight the leverage on the suspension
I think Each wheel arc can be extended or elongated to overcome the bouncing effect.
To counter the bumpiness you want the torque from both halves to be the same. But that would require differently sized halves.
Waiting for part 2 😍🔥🔥🔥
You have to make it work.
Can't wait to see it.
That is truly remarkable. You have managed to bring back the galloping effect of riding a horse while achieving the speed of a modern motorcycle. I am impressed. 🙃 LOL.
If you can market this you will reach two markets at the same time....The Equestrian community and the Motor Sports community.
The real challenge is to make it look and feel like a horse on one half and a modern motorcycle on the other half. I'll leave it to you to decide which half to change.
Respect. Keep doing what you do. It is a lot of fun to follow along.
God Bless
I hope he sees this bro. Im rooting for your date.
Lol so far horses are faster than this one but soon maybe
Speed of modern . motorcycle I doubt that
Don't let the EPA see this
Damn...you guys are nuts... really interesting content the more I watch your stuff the more I really like your channel.
I think if you had 2 separate cut in half wheels that are cut the exact same way it would be great
Can you cut reliefs on the edges of the tires so that the leading edge you created isn’t as sharp? Would that help with the ride comfort?
I think if you replaced rear suspension with solid rod and moved rear rear tire lower few degrees it would improve the ride
It looks like a pretty fool idea, time to watch it haha, if you don't want your motorcycle to bounce you should move the suspension so leverage keeps to be the same for any of the half wheels
Use 60% (as others said) and the hardest solid tires you can find (like indoor forklift tires), your bumpyness will diminish some.
It's bouncing because of the different leverage the different lengths of swingarm have on the spring as the weight changes from tire to tire. The weight of the wheels is also changing back and forth between sprung and unsprung weight at different points on the swingarm/lever. Also..., the front tire becomes additional weight while off the ground but the rear becomes a counter weight while off the ground. In other words the weight felt by the spring is changing.
Let me have that bike 😂
@Michael Scheck I suspect it's not even as simple as making the front one smaller, as the transition from one to the other would still make a bump. I suspect the front wheel could be made a slightly different shape to a semicircle ... perhaps a parabola (or simlar) such that the transition size still matches, but it doesn't heave as much in the middle of the front wheel ¯\_(ツ)_/¯
@ChampagneInMeGoldenGrahams would be even more impractical, but you could do 2 wheels in parallel, and counterweight the removed section of each wheel kinda like a crankshaft.
If the wheels are parallel, you could even just rivet some cut half tires like they did and not cut the wheels, then add wheel weights to the empty side of the wheels to balance them properly. Wouldn’t have half wheels anymore, but still have half tires, and that’s kinda the point of the exercise anyway.
@TheUKDave Yes ... I believe you can fix this by making one of the rear half-wheels a larger or smaller (original) diameter than the other...as to how much and which one...???? Havn't thought enough about it yet...LOL
I should have read further before adding my comment, as you have already covered the idea. Running the tires side by side would be the only way to possibly completely eliminate the gallop. Even adding hard tires wouldn't kill it completely in it's current state as the different lengths of the armature where the wheels are attaches would react different to the centrifugal force created by the off balanced wheels. Even side by side this could be problematic since the wheels would be attached to a perpendicular axle that would cause wag instead of a gallop. The only way to make it efficient to any usable speed (for a practical lifetime for a motorcycle) would be to add a third parallel wheel and weight the rims with enough precision to stabilize the centrifugal force between the three.
Maybe some bracing from the other wheel would help, and it would be cool if you could make it like a tank tread, sort of like a snow mobile
What is the advantage of the split wheel?
Try to cut like 1/3 of the tire out instead of half so there’s some extra tire to roll off at the half way point that might help the bumpiness of it
Hey, i was knowing that the bouncing problem is going to be happen but i thought you will fix until the end. according to my view, you guys need to put the last tyre axle slightly up to the starting rear tyre. i can't actually tell the measurement but you can test it my keeping the last tyre axle upward by testing the rod connecting both rear axles, as i can see there is a connection between both the axles, so you can fix it...
It looks like a good suspension test rig
i think the bouncing in the suspension is from the difference in leverage on the back tire from the axel from that of the front half tire
The trailing edge of the front drive tire is collapsing, while the rear tire comes around with no weight on it making it taller than the other tire when it contacts the ground. They need stiffer tires or possibly there has to be a time of overlap where both tires are in contact with the ground, to get rid of the weird weight transfer
I believe your right the rear axle needs lowered a little
Finally! A perfect bike for me! I’m always tired of my bike riding smooth and stable. I don’t want none of that. This build is the bike of my dreams
"They dont make sawzall blades like they used too" "Howd they used to make them?"
"Better" OMFG I FELT THAT IN MY SOUL
hey im no physics major myself but the bumping seemed to be coming from how much weight was on the 1st rear wheel then transferring the weight to the (furthest)2nd rear wheel. You needed a better shock system or move the whole seat and handlebars back so the weight is more centered.
Apart from the levering issues that others have mentioned, each part (half) of the wheel would need to have a "circumference" of more than an 50% if you want phase alignment/overlap (if you look at it like a sine wave) ... basically due to the abrupt wheel cut and the added friction (ploughing in to the tarmac on each half rotation) their is a now dead spot in the "wave" (I guess a loss of angular momentum etc...).... even if these issues could be resolved, you've now got the issues of a massive table saw on the road and any rock big enough that it can fit in between "wave trough" is probably going to wreak havoc...
Hey man I love your videos and watching them for a while I'm going to be getting a 650 Street bike soon. I was wondering if you had any recommendations for someone looking for the most bang for your buck. My primary use would be commuting but I'm still weighing the fun Factor heavily if not even more since my commute will be short. I'm leaning towards the 650 Ninja I'd love any suggestions that you think I should look into.
Fyi I am on a budget or else I'd probably just go for the gsxr 750. If you have a suggestion on best budget 650 aside from ninja lmk.
Hey guys, this one was wild!! Haha
So, I’m commenting as I watch so if you say the answer in the video I haven’t made it that far yet!! But to the dropping dilemma, the swing arm is longer and the shock is in the original spot. When on the back tire your weight is increased due to the leverage of the extended arm. Essentially when on the back tire you are much heavier. Pretty sure that’s a big part of why it’s happening!
And, instead of locking the suspension fully compressed, had they locked it fully extended (as it was on the bench while being created), I think it would have run much smoother.
@Sebastian Erasmus Should of?
Should of just removed suspension and made sure the swing arm is completely parallel with the ground
I concur with this assessment!
yep, agreed. weight is the same but the leverage on the pivot point moves back and forth
question wouldn't it be smoother if the front wheel was a little smaller and the back wheel a bit bigger? and put in double rear shock, with brake line down the swing arm to rear wheel
The suspention is in a leverage changing alot between the tiers. Would need to be in the middle of the wheels to cancel it out. So if you don't redesign it a stiff suspension would be preferable to a not working one.
Would be great for hill climbing before you put the split tyres on(2 rear wheels) it would fly up with double traction on the rear
The third wheel has more leverage on the suspension, which is why it goes up and down.
Sean, you need to do it to the front wheel as well. That will smooth it out for sure.
Like it says in ...........2nd Opinions 3:5....... "Let's Don't and say we did"
I have a masters degree in mechanical engineering and I approve of this suggestion/comment!! This is -Thēē- solution! 🎉 bravo 🎈🍾 👏🏼 😊
I agree, but then mount two more half-wheels on either side outboard of the fork
im a motorcycle engineer, can confirm
😂
I'm pretty sure it's bumpy because of the edges of the tires are not reinforced, when all the weight is on one edge of the tire it squishes, I would recommend like a steel ring inside of all of the open ends of the tires. also maybe fill the tires with some high density liquid setting foam vs rubber bits.
From the start I was waiting for them to balance those wheels. LOL Oh and the best way to cut rubber is with a razor blade. Now steel belts may cause a problem.
I believe the reason its moving up and down is the difference in leverage, one Tire is father then the other from the spring if that makes sence so if you got rid of the spring and made it solid that should go away
Up-n-down is because the most-rear wheel has more leverage on the suspension. And above on that it influences the weight on the front too, it's further away from the centre-of-gravity.
19:15 I can't believe that not one single person in this entire group intuitively understands leverage.
The fact that they went frame by frame with the butter knife at 13:32 makes me appreciate these guys so much 😂
We all have beautiful hearts.
Please don't misunderstand each other.
please Trust each other.
Repent to Jesus Christ “For the Spirit God gave us does not make us timid, but gives us power, love and self-discipline.”
2 Timothy 1:7 NIV
ht
I'm glad you pointed that out I never would have went frame by frame. Attention to detail in these videos is 10/10.
Yes, all 5 of the frames XD
This could be a awesome flex seal commercial 😂
You should make the front tire like that as well. 😎
I’m halfway through the video and starting to wonder if they are going to balance the wheels
Seems like you need a counterweight on the rear wheel if not both but more on the rear because its throwing its weight up further from the bike so the more leverage it has. You could make a sweet one of a logo or image out of steel or aluminum depending on the weight you need
Might work a bit better if the halves were 5/8 or so to give a longer transition !!
2 possible fixes. 1) Hard tail. 2) Need to move the spring. There will be a spot on the swing arm where the weight of the unloaded tire will balance the leverage difference of the loaded tire which is where the spring needs to be attached. You may have to also counter balance the wheels too but they balance each other out. It's too early for me to work that physics out lol
@dave122288 ...but counterweights would have to move back and forth at the same rate the leverage changes... If I was the lead engineer, and was told to make this tire combination work, keeping cost and weight in mind, I would; 1) 4 link the two tires on the same plane. 2) Figure out the angle of attack for that plane based on terrain intended. 3) Provide appropriate suspension... The oscillating force is equivalent to the rotation speed of the rear tires, vs speed, vs load, forever changing. This is where infinite (∞) is used in math calculations.
@Benny Rest I think I see where you are going. I like your thought process. Think of handles on a wheelbarrow. You can bend the handles any way you want but if you are still the same distance from the fulcrum, nothing changes. In the bike scenario, it would be like holding the wheelbarrow handles at their ends then moving to the rear of the tub. Switching back and forth instantly without a smooth transition in between. Significant weight changes.
@Invincibletro Yes. The oscillating force is much smaller than the force from the difference in leverage the 2 tires apply at the moment though. It may be small enough to just live with for what it is or tune down enough with a damper. If not counterweights would not be difficult and would solve that problem
I thought changing the angle of the rear wheel might help
@Benny Rest When the wheels are like this ( ) this is the exact moment the length of the lever changes, When they are ( ) the lever is the distance between the closest axel and the pivot. What you might be seeing is the A arm angle does change immediately when this transfer happens, lowering the closest axel, or raising it instantly between the transfer between the two levers.
Awesome !
Though it looks stupid at its first look, future iterations of this idea may lead to a certain level of behavior like slip differential rear wheels of the car.
Because it takes traction at two different points alternatively, when you cross into deep mud, you get two traction points, of one half may be on harder solid ground while the other half dip slipping in mud.
Futher more, being not a complete circle wheel can get not only traction but a significant normal push at its cut edges to easier get out from heavily slippery mud condition.
So interesting idea for trail and offroad option 😯
It will bottom itself out on a big bump, and center wheel would be stuck tho
Would cut the tires at 190 degress instead of 180 so you are not left with a end that pancakes every time weight is distributed and the overlap might help transition the wheels better so you don't have a bumpy ride. I think also reinforcing the wheel with a metal bar across the open end would help with forces.
The swing arm length this effectively oscillating between long and short so without some high frequency electromechanical suspension or some linkage that works like a timing chain for the wheels that compensates for that it will ALWAYS vibrate like crazy.
It's hopping because each time it switches wheels it changes the geometry on the spring and shock. (Think; leverage) Replace the rear shock with something to basically make it a hardtail and I think you'll be surprised. 😎