This Simple Walker Was The Hardest To Actually Make

Welcome to another episode of Scrap Mechanic! Today I am attempting to recreate something known as a Passive Dynamic Walker. It is a contraption that is able to walk with power other than the force of gravity acting on it. Give it a gentle slope and it will walk one foot in front of the other all by itself. Mechanically it seems very simple, but as I find out, replicating it is not as easy as it seems.
Video Referenced:
• Passive Dynamic Walking
More Recreating Real Machines: • I Evolved This FAILED ...
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What is Scrap Mechanic?
Scrap Mechanic is a multiplayer sandbox game with imagination and ingenuity at its core. Create fantastic machines, transforming vehicles or sneaky traps. The possibilities are endless with Scrap Mechanics powerful tools.
Find the game here: store.steampowered.com/app/387... #scrapman #scrapmechanic #trailmakers

[@CodeCreature]

If you were to try this again, you'd need a counter weight at the top of the knees. The reason it's not taking the correct steps is because it's main weight is in the feet. If you extend the lower leg through the knee and add extra weight at the top, it will cause the knees to bend on every step. I'm actually super interested in seeing this work and might need to make a video on it just test the concept 😅

[@Hiro_blee3292]

Ok your probaly right

[@Hiro_blee3292]

Oh in i forgot in scrap mechanic or in trailmakers

[@Hiro_blee3292]

?

[@cube3558]

@@Hiro_blee3292 it was probably trailmakers

[@suicidalbanananana]

^ This ^ Plus he should change it so one set of legs has feet pointing forward and the other has feet pointing backwards, that way it will slightly lift up each step, wich hopefully means it wont get stuck on the ground mid-step like is happening 95% of the time with the designs in the video.

[@jakobnorrestam]

10:35 since the concrete blocks at the top are forward of the point of rotation, obviously the outer legs dont want to rotate forward, they actually want to rotate backwards. If you look at it from the left side, the concrete weight at the top is the furthest forward. Then comes the point of rotation, the hipjoint you might say, which is supported underneath from the inner legs. This means that the concrete at the top is actually excerting a rotational force counterclockwise, or in other words forcing the outer legs backwards.

[@kazurijaeger8172]

Try to connect both outer legs so they're in sync. From the looks of it, due to the independent outer legs, the walker tends to move one outer leg only

[@calspacer6685]

how tho

[@rlebron2249]

@@calspacer6685 put a tube in the back that is stick to the two outer legs but skips the two inner ones with enough room to still move backwards the two inner ones. Then put some weight on the front o compensate

[@Friendly_Neighborhood_Dozer]

@@rlebron2249 or use collision glitches

[@veronicaledesma4310]

@@rlebron2249 or just make it go up and above the whole machine

[@calspacer6685]

@@rlebron2249 putting weight on the front does compensate for the horizontal weight balance, but completely throws off the vertical balance

[@pjamestx]

Scrapman, you are still KILLING IT with this series! Not only are these fun and entertaining, but SO IMPRESSIVE too! I literally got goosebumps during your last attempt here, I start every day by watching your latest video, keep up the tremendous work!!! I can't imagine how long this video must have taken, but I really appreciate the effort 🎉🎉🎉

[@bonerbeats]

Day 20: still trying for ScrapMan to please build - M400 Moller skycar aircraft or just a quick build video of all the ideas

[@lemonaids7289]

I just looked it up and yes So much yes

[@sherwansher5910]

Yes pls

[@glowupfortheboys]

ye MAN

[@loganswan866]

I request what this man just said

[@edawris]

Yes

[@franciskurian9392]

Scrapman, I got an idea. Make a beyblade and surround it with magnets facing outwards and use thrusters to rotate it. Use a swivel to cancel out the beys rotation and place another swivel on top of it and place some thrusters to use for changing directions (in instruments of destruction)

[@Mobilegod2534]

Good idea

[@donivanalvarez2172]

That's new

[@PestiPanda]

Magnets dont exist in scrap mechanic so no

[@realization3020]

@@PestiPanda he said in instruments of destruction lol

[@Friendly_Neighborhood_Dozer]

@@nikkiofthevalley no he didn’t

[@danser_theplayer01]

You need equilibrium between the feet and the top, because the top has to go backwards and lift the feet forwards in a knee bending motion.

[@newnamepending7084]

It's forward motion is entirely dependent on linear momentum, the two separate sets of legs act as a pendulum and create the perpetual motion necessary for it to "walk". You'll need to experiment with weight distribution and friction on the feet.

[@frionlixzy3863]

im getting the feeling whenever i see it move, i remember how happy i was when my niece first walked by himself XD

[@Alexmow]

I love how you show us some background info on what you’re about to make with some videos and images. It’s very interesting and I like it!

[@rlgames3436]

Thank you scrap man as always you lighten the mood in my mind😊😊

[@ryanbard8555]

This was a fun one to watch, exciting to see it finally walk!

[@seango584]

This was an insane build! You're complex builds are so cool!

[@SuperDantedmc]

I really loved this video. It makes me happy that you didn't just give up at scrap mechanic's physics. Great job Scrapman!

[@thatguyyt2576]

Imagine not watching this guy 😂

[@B14.Shawno]

Idk if u noticed but the 2 middle legs Are a little bit shorter than the outside legs

[@xenogryph7169]

I'd say make the outer legs a tad bit shorter than the middle legs and use a bit of @Code_Creature 's knee counter weight method. so the inner legs when they bend will give it just enough lift to move between and when they settle will give a bit of a lift for the outer legs to swing out to miss colliding with the ground? Or make the feet on inner legs a little thicker?

[@avanishdoki194]

this is true this fact was killing me

[@tomflynn3433]

More comparison on builds between these games is a cool idea. Enjoyed this!!

[@Graytail]

Going back and looking at the original footage Scrap, I think the plates you've taken to be just to stop the knee over-extending actually play a role in the stepping motion as a counterweight to the lower leg. That could explain why your big knees walker around 16:00 is working a bit better

[@Crobot-yf6cq]

It has been 2 years since I have watched you and your videos and intro are still amazing keep going man you are the best

[@recaru0331]

This is like watching a dad seeing his child's first steps... so wholesome

[@AggroPhene]

so many suggestions, i will just admit u picked a lovely escapade for physics games

[@Graytail]

I had a go at building one of these things myself after watching, and doing some research on them shows they are notoriously difficult to get working. These biped/tripod types even moreso. The common approach to them is to provide them raised spots for the feet to land, because the swinging legs tend to ground out as they are all the same length. I found one that used a cam of sorts to lift the leg that is swinging forward clear of the ground, but I really dont know how you'd do that in either game, if its even possible. So your couple of steps Scrap were very impressive! As a note, the videos I found where their bots could take a half dozen steps if they worked at all, were from engineering collage and university students that had weeks to work on them with reliable real-world physics. The slopes they used were mostly between 2% and 4% gradient, but one of these bots seemed to be able to handle flat interior floors somehow. It was far more complex though, full of weights and springs so likely some sort of conservation of momentum mechanics involved. As a side, I found a sort of workaround for the clipping issue you had with the initial knees. The weight blocks dont seem to have that issue.

[@bsg75husker]

really like that you tried it in both these games ;)

[@pocolyte2763]

"Every step past the two first steps is just a mind-blowing experience" Scrapman is like the parent seing his child starting to learn how to walk haha Great video as always keep it up !

[@maxis_scott_engie_maximov_jr]

When complex mechanism walkers are easier to build than one that relies on Gravity:

[@minedphoenix454]

I like how he ignored that the legs in the middle weren't supposed to bend. Makes the vid even better

[@theforg0ttensorcerer]

If you're gonna do this again, make it so that the outer legs are shorter than the inner ones. Normally the steepness of the ramp achieved the same effect, but doing that is much better as it will make the outer legs fall later and not make it collapse. Also join the outer legs.

[@Light-ne7ht]

You should make a walker in instruments of distruction.. but make it deadly somehow!

[@nateolmsted22]

Even though it was only kinda successful, those few steps were weirdly satisfying to watch 😂 great work 🤘🏼

[@scrapman]

Thanks 😅

[@kennethmitchell1418]

I would have worked in scrap mechanic but with how little parts you have to deal with and the various types of slopes helped you get to a working concept in trail makers a lot easier

[@tottalynot3622]

I Imagine this is how Scrapman will teach his kids how to walk

[@stevepittman3770]

Wow, you got way further with that than I expected. I think shortening the outer legs by 1 block might make it better, cause it's the outer legs that always seem to get hung up on terrain and can't swing by the inner set.

[@rouhfus]

gravity walker: *takes 2 steps and falls* scrapman: *IT WALKS*

[@tin7214]

Great video as always. I recently found out about a helicopter with no engines. It flies using jets on the tips of its propellers and lands using autorotation. It's called xh-26 jet jeep.

[@NotVirtual]

We have witnessed one of the first crossover video between Scrap Mechanic and Trailmakers

[@lililili4724]

Hey scrapman! One thing I noticed with the scrap mechanic design was that the walker was starting with the angle of the slope instead of being perfectly upright. I think that might have accounted for something, since it would gain more momentum once you release it.

[@Nash--by2vm]

According to my intense calculations using addition and subtraction, I have figured out that ScrapMan is approximately 32.

[@loading...2414]

Your later scrap mechanic versions would have most likely worked had you used a less steep incline. The reason they didn't work was that the knees wouldn't bend, and that was because by the time the center legs hit the ground, the center of mass was ahead of them. But, if the incline was less steep, the center legs would hit the ground earlier, so the center of mass would be behind them causing the knees to bend. This could also be solved by adding a weight to the top that is behind the connecting bar, or lowering the knees in the center legs.

[@gamerwolfpogs7619]

this is sick

[@CalGames]

2 games in one video. What a combo

[@aeresys]

Suspension kneecap is something I never thought I'd hear

[@Music7Ada]

With the amount of tips in the comment section, we NEED a part 2! I believe in the 4-leg-robot-child!

[@paulearnestvillaflor]

That’s pretty cool

[@KILM011]

Wow I'm here early but love what up do scrapman I've seen all you vids at least 2 or 3 times each re watched every series multiple times

[@shacogaming1976]

What an exciting video! Maybe if the longer legs were connected in the back it would trip less

[@i_forgor7268]

Lol this is like how scrapman becoming a parent to a walker

[@roseline2017]

just like first time see your kid make 1 small step make u really happy.

[@ParadoxInfinite1]

I think in scrap mechanic you may need to add weight to the outer legs. potentially add another "kneecap" to the top of the inner legs as well. ideally you want the inner legs to plant and not move forward anymore. you then want the outer legs to move forward fast enough to plant themselves and swing the inner legs again. also something to note: in the IRL design, the kneecaps are a bit less than half the length of the "thigh" of each leg. So medium weight on inner legs, heavy weight on the outer legs, longer kneecaps, kneecaps are lighter weight than bottom of legs.

[@venoisboss6052]

I don't know if this will help but I think a key part of understanding how these walkers work is it seems that the top bar the very most top never stops moving forward when the legs step in front of it it has to have enough momentum to carry it up and over the arch if it doesn't have enough momentum it will stop before reaching the peak so I think a key part would be to make sure that that top bar is constantly moving forward it might slow down it might speed up but it just needs to be moving at all times

[@69production60]

Doing stuff like this would be good for a live because you can take suggestions from the chat

[@danthiel8623]

Yes this 👍☝️

[@foxracerdrew]

I wonder about recreating some of these mechanical builds in Main Assembly.

[@Nucl3armade]

Yo, his scrap mechanic self and his trailmakers self finally did a crossover!

[@th3darkgem566]

The ultimate final boss: The Gravity Walker

[@DrEggoEggtavius]

Very cool👍

[@bobbyhill3535]

Hey scrapman I just wanna say that u should do the waterman’s arrowbile it was the very first flying car I personally think it’s pretty cool

[@delinquentt_6121]

would love if this guy made a second channel were he uploads other content he plays in his free time (if he even does), as long as its not too much work

[@Notabot-de7ci]

sometime in a future episode you should build a lun-class ekroplan luv ur vids

[@technosyrup]

I believe the purpose of the knee caps is not only to stop over-rotation of the legs, but also as a counterweight allowing the legs to bend in the first place.

[@gamerwolfpogs7619]

i loving your videos

[@andrewcommander6434]

16:14 Scrap man: turns out walking is hard… Creation: new record.

[@BLKBRDSR71]

Now I wanna build one. 🙂

[@user-qj6zy4tl5h]

2 games in one That's a record!

[@TommyCrosby]

ScrapMan really looks like a dad watching his child try to make the first steps in this one.

[@wuduptuck6933]

You should make a walker that walks like a camel, camels walk in a very unique way unlike most other quadrupeds

[@sleepygeek2821]

You should take a look at the Rotodyne. Its part passenger plane part helicopter hybrid and has a pretty unique way of powering its main rotor. :)

[@graysonstretch3321]

Did you notice that the High Seas map has islands that have the same colours as You(Scrapman), Kan, Kosmonaut, and Moonbo (or Durf)

[@SwankiestPants]

I'm no expert on this sorta stuff but with your most successful model I noticed what might be causing it to not keep going, the outer legs appear to be taking steps that are too large for the inner legs to keep up with which is why it's always the inner legs getting caught on the ground, perhaps try limiting the size of the steps in some way, perhaps similar to your solution with the knees, if you decide to try this tip out I'd love to see it in action

[@blakeschannel0824]

ScrapMan, you should make the turtle submarine for your next video.

[@McA_1987]

Can’t believe you got as far as you did. Great job. I’m wondering if either the inside or outside legs are slightly longer or heavier

[@tbuk8350]

Yeah, they probably could've made it consistent, but they missed some key points in the video. For one, the outer legs should be slightly shorter than the inner ones. Another issue is they put a counterweight at the top front of the walker, which actually causes the legs to bend in the opposite direction they should, causing them to be straight. They should add counterweights to the knees instead. They also forgot to bind the outer legs together like they were in the video, which would prevent any failures due to one leg moving while the other doesn't.

[@TheElectricCaveman]

This was a delightful experiment, thanks for exploring my suggestion! Also, these aren't much easier to build IRL

[@Madmax-ij4px]

This is one of the first times I have seen him go to a different game because he couldn't get something to work in the first game

[@xnrs317]

Day 309 of asking scrapman to make a plane dogfight evolution video (trailmakers)

[@franciskurian9392]

Oh hi

[@xnrs317]

@@franciskurian9392 omggg its you. Youre backk

[@scottgarvelink1289]

Man wish I had these games. I think at first make sure the bends are even at the top and bottom of the legs. Then if you look at the 98 video the way they made the knees and with them having an extension to clap the leg when the other ones move forward. And they only travel so far forward. So if you can stop the legs from going to far forward it might help. I'd say just go back and continue to look at the 98 video and see what's missing. And id try to still try to make it walk flat instead of going down hill. But that's the hard part too.

[@lasinhouseinthetrees1928]

hey scrap man I know you've almost 100% seen Wintergatens marble machine but I think you should give it a try after the new scrapmechanic challenge update comes out with the new balls. It would probably be a longer series but I think you'd enjoy it!

[@cid2087]

It feels like scrapman watching his baby trying to walk

[@mirage9525]

Very big fan for 4 yrs

[@jmg5078]

Here are some fun ones i wish scrapman would make: Cornu's helicopter fritz von opel's first jet Pou-de-ciel fabre's hydroplane Spirit of america (craig breedlove)

[@mateo.clown.com.]

Another reason to start it, is to put a controller and a cardboard pillar sticking out the back of the walker with a controller, a timer, a mountable spud gun and a switch...The switch will activate the timer, activating the spud gun, which shoots the cardboard AFTER the controller has set the angles the the bearings that they need to start, so basically u are just setting the walking position(controller), then getting rid of that connection by shooting it(spud-gun which is activated after the timer activates after an amount of time).

[@metalandsteel]

Idea: Add weight to the back of the frame to hopefully balance it out slightly and take a few more steps

[@pixelatedpuppet895]

There is a mechanism in the original video that slightly lifts the legs so they don't drag on the ground. this may make this build work better.

[@meisam3dfoxh467]

I think you can make this in Main assembly game. Because in Main assembly you can build good platforms without any noise and movement.

[@0megaming]

you might try it with the suspension and a bit of better weight distribution in scrap mechanic.

[@dracoyt7061]

I'm guessing the walker with the arms in the video has magnets on the end and on the side of the bored is another magnet so it pushes up and prepells instead of contract so it stays in a straight line but I could be wrong just guessing off of what I saw :)

[@shilpagalla1234]

its pretty intresting that he switched games in the middle of the video

[@Muziek37414]

Time to recreate complex creations in main assembly or besiege :)

[@TOPSYKRETTSHERE]

a limit to leg spread would help too

[@minheepark4896]

The top joint has the be heaver then the bottom joint so the top can get ahead of the bottom casing it to bend

[@bleudecoup6478]

hey scrapman, i'm new here. but i think it could work if the feet had three small contact points. and the weird ww2 barrel bomb on wheels could go more straight if you would balance the weight on the backside into something more dragster like. from upside down look it needs to form a "T", like a medieval cannon (sry for my bad english). tripod feet like animals // T-shape for better movement. nice vids man.

[@theduck4482]

What, i feel like ihadastrokereadingthis

[@moroblizniak4457]

YET AGAIN Trailmakers proves itself being SUPERIOR building game!

[@mjrdainbramage]

This was cool! What if you add a central pendulum, or two on the sides, so that inertia keeps it swinging out of sync with the legs? That could possibly maintain the forward movement. Not to mention that a central pendulum would look a bit... anatomically correct. 😄😆

[@Gorollian]

one thing I noticed is that if you made the inside feet just a block shorter it might have worked better because the one in real life had shorter middle legs than it did outer legs and if that doesn't work than do the opposite next time. I don't have either of the games but i thought i might Aswell mention this because these might work.

[@gaminghub8108]

Also 16:33 "We're Ge''ing it" ScrapMan has become BritishMan

[@avanishdoki194]

people pls like so scrapman sees this yo @ScrapMan you had a fatal error in scrap mechanic. the inner legs were a few blocks (maybe 3 or 4) shorter than the outer legs. so when the outer legs hit the ground, the weight on the top causes the whole mechanism to tilt forward. when this happens you can observe in 9:36 that the outer legs try to bend but hit the ground before they reach the proper position to start the cycle again

[@wildrosomak3395]

The weight (in Scrap Mechanic version) shouldn't be on the top of this walker, but on the upper rod connecting inner legs, because it was pulling pivot forward instead letting it reverse! Look at the top part going forwards and back in the Trailmakers and the real version. Put the weight one part lover.

[@mosssaurusrex3428]

i suggest making the weight facing forward as then the outside legs swing more forward.

[@nic2097]

I have a feeling one of the reasons it wasn't working was because the slope was varying, it wasn't a contestant slope and the Walter is designed with one continuous slope in mind

[@AlrenClan]

It would be cool to see concept vehicles from games and not just real life concepts.

[@apersunthathasaridiculousl1890]

interesting how he switched up games, and i kinda like it

[@squoshi307]

Isn't the second example exactly the way of how TARS from Interstellar works?

[@moortyperepa]

Yea... That was the same thing that popped in my mind!!!!!

[@outzymes3636]

Lol I looked him up and he looks like a monolith

[@squoshi307]

@@outzymes3636 TARS is basically 4 monoliths that spin in symphony to move.

[@outzymes3636]

@@squoshi307 yeah, I somehow find that adorable. any robot without eyes or a visible camera i find adorable. like a sentient computer screen or something

[@burningcaiman208]

you should have set it down the catwalk ramps they are much smother and more consistant