Which Shape CUTS BEST? (Weed Eater Line at 100,000 Frames Per Second) - Smarter Every Day 238

  • Közzététel: 2020.jún.28.
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    ⇊ Links to buy the winning weedeater line ⇊
    What’s it called? Weed Eater, String Trimmer, Weed Wacker, Whipper Snipper?
    Google Trends map here:
    (When people purchase from these links it will support Smarter Every Day.)
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    THE WINNING SHAPES (As a result of this EXTREMELY limited data set)
    Oregon “Gator Line” (Called “sharp square” in the video)
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    Star shaped line
    Cyclone Brand
    140 ft ~ $15 amzn.to/2AeCmfq
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    (I couldn’t find Shakespeare for a good price on Amazon but here is the style I tested)
    125 ft ~ amzn.to/2ZnBRbA
    Other stuff:
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    Project Farm Tested Durability: huchannel.info/video/rruwrGisqKbCg74
    He tested other considerations here: huchannel.info/video/np6onXurZ6O5qcg
    I thought this was a well written break-down of different shapes: www.saraheberle.com/understanding-the-various-shapes-of-trimmer-line/
    It’s interesting that so many different companies have their own proprietary shape etc, but I can’t find any scientific research to back any of it up. Fascinating!
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  • Tudomány és technika

Megjegyzés • 100

  • SmarterEveryDay
    SmarterEveryDay  16 napja +5932

    Robert subscribed then hit the bell. Be more like Robert. In all seriousness I was impressed by how quickly he came up with a well thought out, nuanced hypothesis without even a moment’s notice. Huge thanks to Robert. Also, a huge thanks to everyone who supports Smarter Every Day on Patreon at www.patreon.com/smartereveryday
    Thank you!

    • BethesdaSucks
      BethesdaSucks 2 napja

      It would be great if you would make a video about water jets, how it works exactly, there are only videos where it's only roughly explained without proper physics explanation (where even cavitation is included).

    • Muhammed Zulfikhar
      Muhammed Zulfikhar 4 napja

      Turbulent flow is better than laminar flow

    • Muhammed Zulfikhar
      Muhammed Zulfikhar 4 napja

      Turbulent flow is better than laminar flow

    • Muhammed Zulfikhar
      Muhammed Zulfikhar 4 napja

      Turbulent flow is better than laminar flow

    • Muhammed Zulfikhar
      Muhammed Zulfikhar 4 napja

      Turbulent flow is better than laminar flow

  • QSA 2.0
    QSA 2.0 22 perccel

    I like Robert lol

  • Heather Allen
    Heather Allen 5 órája

    i say weed eater or sometimes weed wacker, cause sometimes wack sounds more harsh. idk

  • Exquisite Arc
    Exquisite Arc 6 órája

    Roll Tide

  • Shadow. Cop
    Shadow. Cop 7 órája

    I’m in California and I call it a weed wacker

  • Dominick Solerix
    Dominick Solerix 8 órája

    Why doesn't he mention which weed eater he's using? Or did I just miss it?

  • David Artman
    David Artman 9 órája

    I found myself wondering which type of cut is healthiest for the grass to continue growing. 'Bashing' the grass into shreds doesn't *seem* to be ideal, but perhaps it stresses each strand more, leading to more vigorous growth/repair?
    Also, which is more pleasant on which to walk barefoot? Shredded seems like it would be softer.
    What's the end goal, one might ask?

  • Lender S
    Lender S 11 órája

    Destin would be the best neighbor

  • nitcat1
    nitcat1 13 órája

    Interesting. I’d like to see you do another test of these. Funny that you call it a weed eater (so do I) but you didn’t test it against a weed! I’m dealing with some seriously tough weeds. Clean cuts are nice, but I want the weed knocked down efficiently.

  • Tommy Smith
    Tommy Smith 13 órája

    Would have been interesting to get the rpm. Unloaded and loaded.

  • Brad H
    Brad H 13 órája

    You REALLY need to buy a speed feed trimmer head.

  • John the Schreiner
    John the Schreiner 16 órája

    I've heard weed eater, weed whacker, string trimmer, and whipper snipper. Personally I go with weed whacker.

  • nibbsie 78
    nibbsie 78 19 órája

    Wrong!!! In Australia it is whipper snipper!

  • AAA
    AAA 21 órája

    Wipper Snipper -Australia

  • M.O.R.S!! of doom
    M.O.R.S!! of doom 23 órája


  • Dustin King
    Dustin King 23 órája

    I'm a slow motion weed eater myself so I can relate to the whirlwind spin 😂🙃

  • 4Curses
    4Curses Napja

    Welp, her´s my take on this. I would take the sharp sharp square or the thick round one, for the reason i would use one of these: Cleaning the edges and places i don´t reach or can´t easily do with a lawn mower. Those have seldomly grass, by the way. For example stinging nettles and other WEEDS that grow high and have a strong stem. Stuff like wild raspberries and thorny vines. I personally would seldomly use this tool to cut grass.
    Another reason, when i would use it on grass, it´s grass i don´t really want to grow anyways, so using a line that rips instead of cuts makes more sense, since a rip need a lot longer to heal, than a clean cut. So i would actually want to be the wound to be as messy as possible.

  • Scuzz Glass
    Scuzz Glass Napja


  • XianH20
    XianH20 Napja

    in norway we call it an edgecutter because we use ity where we cannot get the lawnmover

  • x x
    x x Napja

    Im in Ohio, I say weed wacker. fight me Dustin.

  • Aidan Schilling

    Idk if there is a more dad thing to do then this

  • Thomas Kovarik

    You see the slowmo...it's WACKING the grass

  • Kevin Reardon

    I use a light weed trimmer, but I can't trim close to my neighbor's tires.

  • kwprice1987
    kwprice1987 Napja

    I did landscaping for 3 years and I noticed the weed eater itself plays a role. Higher hp makes cutting easier. Less kick back and deviation. You can literally edge your lawn. I can't do that with my cheap one at home.

  • Joel Teer
    Joel Teer Napja

    We always called it a weed whip

  • hfandgkrsyjsvmfjjsfjitsjdgmfuzhvn

    its a weed wacker, it doesn't chew and swallow grass and weeds, it wacks it with a string

  • Frog
    Frog Napja

    I'm not a Christian but the verse you left at the end was very insightful, especially in these times.

  • Jordan H
    Jordan H Napja

    It’s a strimmer grow up

  • Sw Gaming lol

    The fact you call it weed eater is taking a part of my soul every time you say it

  • PinkRose3101
    PinkRose3101 Napja

    South Africa: Weed Eater~

  • gamma sava
    gamma sava Napja

    The thing that gets me most excited is the verse at the end of each video.
    Anyways, this channel is awesome, probably my favorite

  • Jeff Chenevert

    As you mentioned, how well the line cuts is important. Torn grass turns noticeably brown on the ends. However, of probably equal importance is how well the line feeds. Nothing I hate more than having to stop and take the feed head apart to fix a line jam. I tried the sharp-sharp-square line a few years back. I loved the durability and cut, but it kept jamming in the feed head. The sharp corners would deform where the line crossed over itself when wound onto the spool, locking the line to itself and preventing it from unwinding from the spool. So, I switched back to round. After watching this, the star shape does look tempting though. I'd be interested to know how well the different lines feed.

  • Milky Joe
    Milky Joe Napja

    "and i will like and share" ahaha made me chuckle, good on ya robert.

  • MF Kitten
    MF Kitten Napja

    Okay, so one thing I'm thinking is that maybe the suction that the wire causes plays into how well it cuts, and you've negated that by tensioning the grass?

  • The Reptile Dude

    Weed whacked here :)

  • Arman Jay Bayona

    At what angles did you cut the ends?
    I think the cut will be cleaner if the ends where cut at more sharp angles.

  • Hamilton Mcgregory

    Id like to side with Robert about what he said and wanna add because of the star shape the points could act like little blades providing a cleaner cut

  • Nathan Blouin
    Nathan Blouin 2 napja

    I’m from the east coast. Mom from Rhode Island Dad from New York. That’s a “Wheeed Waahachah”

  • Bob The builder
    Bob The builder 2 napja

    Im from north dakota and its a weed wacker to everybody around me

  • Trey Zipprian
    Trey Zipprian 2 napja

    Hey Destin I've been watching your videos for several years now and I just want to let you know that your channel has absolutely 💯 made me smarter everyday. Just by the random videos to the extravagant videos that u publish. Im a centrifuge mechanic and I work on vertical and horizontal centrifuges. Some of your videos has help me understand the Mechanics behind on whats actually goin on inside the system a little better then what I used to know. Just want to say thank you for your sharing the information on everything you do. Good luck with your channel and I will be donating to your patreon here soon....your friend trey

  • Phillip Ortega
    Phillip Ortega 2 napja

    Haha so convenient. I say weed eater. I prefer that yellow Shakespeare ( first one you reached for)[triangular line ugly twist]

  • Joseph Dow
    Joseph Dow 2 napja +2

    When he talked about the line being smaller and making it move faster it got me thinking it would be nice to get a top down angle of the line at full speed and see if they stick straight out or kind of trail behind and curve back and I'd that angle to the grass blade makes a difference.

  • Jakob B
    Jakob B 2 napja

    I like the way aussies say weed wacker, “whipper snipper”😂

  • masteradvance
    masteradvance 2 napja

    Interesting, i call it weed wacker, im not native english speaker, i call it like that because of my step father, he from Maine-New Jersey, i was like oohhhh that makes sense!!!

  • Masonator !
    Masonator ! 2 napja

    On the west we call it weed whacker lmao

  • JackyBoy Slim
    JackyBoy Slim 2 napja

    From Pennsylvania and most of not all people I know call it a weed whacker. But I have heard it called weed eater. Also I use the cheap star shaped line from Walmart.

  • dynamite_ K64
    dynamite_ K64 2 napja

    I live in australia and no one that I've come across has called anything but a whipper snipper, don't ask me why.

  • Dragon
    Dragon 2 napja

    Weed eater? wE hArDlY eVeN knOw hEr

  • axeman098
    axeman098 2 napja


  • Nitrodasnipa Z
    Nitrodasnipa Z 3 napja

    The star seems to cut along the top and bottom, and discard the middle area whereas the others at best cut one spot and just bash the rest out of the way

  • Ritik Kumar
    Ritik Kumar 3 napja

    Robert is a nice guy !

  • Darron Freels
    Darron Freels 3 napja

    I want to know the science behind why batteries drain/die when laid on concrete for an amount of time

  • Waffle Duck
    Waffle Duck 3 napja +1

    ... Why did the chicken cross the road

  • choirboy25
    choirboy25 3 napja

    I've always called it a weed eater or weed whacker. I'm from Iowa, and both of those terms get used pretty often. If somebody called it a strimmer I would have no idea wtf they were talking about.

  • James Robins
    James Robins 3 napja +2

    At 4:15 you say "clearly, there is no titanium in there".
    Most likely, there is Titanium Dioxide.
    Any plastic with any white has it. And , since they took the lead out of paint, all paint has it. Check the label on powdered coffee creamer. It's in there too. TIO2 has a very high density, and will add mass. The translucency of your sample shows the content is low, so it won't add much. They added enough to say they did, to impress impressionable consumers.

  • Kiwi Bloke.
    Kiwi Bloke. 3 napja

    Called a Line Trimmer here in NZ . Weedeater is also used because they were the first advertised brand as far as I know

  • Nofer Trunions
    Nofer Trunions 3 napja

    Test has merit to see which produces the least damaging cut which is important for grass health.
    However, I hate to say it but hanging the weight on the grass is completely different from cutting grass. The weight obscures the ability of the line to "bite" into the free standing grass without sliding as the grass blade is bending out of the way.
    A line which "bites" will cut the grass with minimal "bending over" resulting in a more accurate cut height. Now keep in mind that while a blade of grass is easy to bend, the string velocity is high and the higher it is, the more effect the grass blade's inertia comes in to play.
    If velocity is quasi-static, the grass bends out of the way and nothing happens. If the velocity is extremely high, the inertia will keep the blade from bending at all and the bite of the string has no effect. Of course you could look at the cut: is it a nice slice like with scissors or a ragged rip. (NOTE: the test of good hedge trimmers is a nice slice and no rips.)
    I believe if the line does not bite, the weed eater will perform poorly in high, dense, "needle" leaf grass (is that fescue?) I believe you were testing on a rye grass with a nice broad, thing leaf.

  • chas sisom
    chas sisom 3 napja

    This is the answer to my question. Thanks

  • Christopher Worthington

    Can we see a video on the physics of the movement of snakes?

  • Logan Trimmer
    Logan Trimmer 3 napja

    I actually do call it a weed whacker and I live in PA so that seems to be true

  • Lucas Johnson
    Lucas Johnson 3 napja

    Destin, I would love to see you coordinate with Abom79 and capture some slow motion footage of him using his shaper. I believe he's from Pensacola Florida and I really like watching him perfect his craft. I bet he'd love to see footage of how the different tools he's making cut metal. PLEASE READ THIS! Also enjoy your channel just as much! Keep up the awesome work!

  • ptw783
    ptw783 3 napja

    @SmarterEveryDay- destin how can we get ahold of you for videos ideas?

  • Havana Woody
    Havana Woody 3 napja

    I tell you what, the star line is the winner for grass you want to look good and remain healthy, and after seeing this square, ill never use it again on grass.

  • Nolan Moore
    Nolan Moore 3 napja

    I feel like a ripping motion would be more healthy for the grass, as it may not cut directly through the cell membrane. this is why ripped lettuce will not wilt along the edges as fast as cut lettuce.

  • Lithane
    Lithane 3 napja

    Just got to wonder how many heads get turned your way like "Why is that guy yelling at a camera" when you narrate in a store like that...

  • Spaghetti Monster
    Spaghetti Monster 3 napja +1

    lol 2 million views: slo mo weed whacker... wtf has happened to the world. slow !@#$ing news day I guess... 2 million unreal Justin you are a cool guy but the internet going public was the beginning of the end. the addiction that is so powerful nobody dare utter the truth. Dont get me wrong the instant 2 way communication that is quickly replacing the one way communication of the tv is a good thing. Before the internet the one way communication of tv, radio, newspaper and magazine's said what ever they liked and we just listened. the main stream media still says what ever they want but now we can chime in. Huge Change, Ginormous even. It is not surprising with this new power that the extremists and anarchists are the loudest, I just wish the politicians would stop stop pandering to them and figure out that they are a small majority relatively. Reasonable people want police reform, extremists want to abolish police altogether. Anyways, the addiction nobody will admit cuz there isn't anyone in opposition, the internet is the path to self destruction. Agenda driven tabloid news is fostering the divide and taring the country apart. That is something China and Russia could only dream of doing, the msm pitting Americans vs Americans - eroding the country from the inside out for attention and clicks.

  • Rory Christel
    Rory Christel 3 napja

    Thumbs up for Weedeater Guy. That dude is humble and knows a thing or two ;)

  • arthurneddysmith

    How do you know that the different blades of grass for each test are the same thickness or width? Edit: Or that all weed whacker pushes on the trolley are similar?

  • arthurneddysmith

    Nope. In my state of Australia, we call it a "weed whacker".

  • SRT8Ace PSVR
    SRT8Ace PSVR 3 napja

    As a medic and a dad who does NOT enjoy weed eating, would it be more effective to use the line that does the most damage/ least clean cut? I'm certainly not a botanist so if I'm completely off base here then someone correct me but in humans and animals, a cleaner cut will heal faster. If the same applies to plants then using a line that creates the most trauma should increase the time it takes for the grass to regrow and require cutting. Factor that with how well the line itself holds up and you should find the most efficient line for your weed whacker.

  • Davide Comboni
    Davide Comboni 4 napja

    hire the dude!

  • Junior LEGO Master

    I call it a wipper snipper

  • Ramon
    Ramon 4 napja

    We can say "trimmer" in Russia, but it has similar pronunciation with "streamer". Well, we usually say "газонокосилка" instead of "триммер"

  • Manusinh Rahevar

    I have an idea if you can film it in slow mo.
    Once while taking a bath i saw drops on a surface of tub. As soon as i touced A DROP with my finger, the drop formed a shape similar to a concave lens between my finger and the surface and it happened really fast.I thought that the drop would spread out when i touch it but it just pulled up toward my finger.
    I wanted to ask if you could make a slow mo on this and explain the physics behind it.

  • Avery Ronchi
    Avery Ronchi 4 napja

    Please say weed wacker next video

  • SassyBashir
    SassyBashir 4 napja

    Destin, could you please do a video explaining contrails and 5G. I'm really over all the conspiracy theories and my friends just say I've my head in the sand, because i don't believe them..

  • That’s a lot of Sodium

    I thought it was weed wacker

  • deathshooter 72
    deathshooter 72 4 napja

    I would call the sharp, sharp square the concave square. Just saying.

    Sorry if I sound rude, I'm not trying to be

  • Paragliding Guys

    Do you self-identify as a Dull Square or a Sharp Sharp Square?

  • lol_nl
    lol_nl 4 napja

    Why did the chicken cross the road.

    Weed eater

  • DieselBoulder
    DieselBoulder 4 napja

    One thought on the goal of this research. The initial assumption/goal for this was you were looking for the type of line that would do the best job of cutting the grass. However, there is a little more to it. When you cut the grass given that some tear, some delaminate and some cut the grass how it re-grows afterward could be/should be a factor as well no? For example, while one line might cut the cleanest or easiest how does the grass recover from that cut? You may end up with a faster cut lawn, however, you may end up with more brown-headed blades of grass afterward. Taking this a step forward finding the pareto-optimal solution to fast cut and aesthetic grass sounds like a truly worth ig-nobel level of research

  • steeltoecapthongs

    In Australia we call it a whipper snipper

  • Tapper21
    Tapper21 4 napja

    I tried just about every different kind of line I could find (various prices, shapes, etc) over the years until I started using some pink star shaped stuff with about 6-7 sides that twist along the line, its VERY sharp on all the corners and very rigid to the point it cuts my hands up when i restring the head, the "flutes" dig in like a drill bit as the line tries to twist while I wrap it around, but the swearing and the stinging cuts are worth it for how much longer it lasts compared to everything else I have used, it seems to cut better or at least just as good, my primary concern is how strong it is because I hate bumping the head to feed more line constantly and then restringing it. I lost the packaging a long time ago and it has lasted me so many years that I am just hoping I will be able to find the same stuff again when I run out. As you demonstrated the difference in noise level I also realised myself that this line is considerably more pleasant to use than regular round line for that reason also. My ONLY complaint with this particular line is that when pieces do snap off (bump the head and the excess gets cut off) and those pieces hit my legs...... they cut flesh VERY well, adding to my pain I started using an 18 volt brushless trimmer instead of the Honda and the slower speed and increased torque seems to only make the pieces aim for my legs better :P big issue in summer because it is TOO HOT to wear long pants but in winter its not so bad :D

  • Christopher Collins

    6lb nylon fishing line

  • kibukun
    kibukun 4 napja

    I always heard weed whacker when I grew up in Seattle, and then I heard everybody call it a weed eater in San Diego.

  • AlanXD
    AlanXD 5 napja

    It’s a strummer boi

  • LinearAnalysis
    LinearAnalysis 5 napja

    It seems like the star may have more of the right turbulating pitch to create more of "golf ball" dimple effect (if the dimples are too deep or large you lose the aerodynamic advantages) as aerodynamic turbulators versus the coarse pitch of the square which I think might trip the turbulence into less stable oscillating state. I bet if you could do an even more high speed camera and at different angles you could see the way the air it is passing though causes vibration in the filament. It'd be interesting to see a study that gets more into the specific velocity of impact and the stiffness of each line with one blade of grass versus an increasing density of blades it must go through to determine specific cutting efficiency per mass of material removed in the cut and for different DOC for a static amount of KW/HP in. I'm going to stop before my wife wants to strangle me for nerding out on HUchannel at midnight... Cant help it. (Kietty, if you're reading this I'm sorry but not sorry... love you babe ;) )
    LMK what you think!

  • Matthew Tanner
    Matthew Tanner 5 napja

    you forgot about grass cell wall integrity, not that you can account for that...

  • Matthew Tanner
    Matthew Tanner 5 napja

    it's a weed-eater. who laughed. ur dumb.

  • Gladwin Kurian
    Gladwin Kurian 5 napja +1

    I challenge you to make a video on differences in 'audiobook' vs 'reading hardcopy of the book' :-)

  • Ray
    Ray 5 napja

    meat beater.

  • Kriste Isopahkala

    I love Robert. What a wonderful dude.

  • Kriste Isopahkala

    Are the sounds real in the slow motion? They can't be, right?

  • Kriste Isopahkala

    This is probably the coolest slow mo I've seen.

  • Ken Hagen
    Ken Hagen 5 napja

    Robert said he wouldn't call himself an expert, but then provided multiple valuable pieces of input immediately on a project he just walked in on. 😂

  • Michael Mundlin
    Michael Mundlin 5 napja +1

    How short can the wavelength of the electromagnetic spectrum be? Is there a limit on how short the wavelength can be?

  • torrace12
    torrace12 5 napja

    The weed eater guy is such a cool archetype of an american worker
    lots of work pride and personality

  • torrace12
    torrace12 5 napja

    the line the professional used was mounted on a more powerful weed eater
    so it would have straightened out completely?

  • 83N74M1N
    83N74M1N 5 napja

    professional sharp-sharp-square line needs to be soaked in water for a few days before using to get more flexibility and higher durability

  • Super knullisch
    Super knullisch 5 napja

    Strimmer?? What!?! No.. it's Trimmer! in Sweden at least!😁