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

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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)
288 ft ~ $15: amzn.to/2CFXewP
895 ft ~ $30: amzn.to/2ZlvTHU
Star shaped line
Cyclone Brand
140 ft ~ $15 amzn.to/2AeCmfq
855 ft ~ $50 amzn.to/387oPCV
(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:
❓Mystery Item (just for fun): amzn.to/38aNmXv
Things I use and like:
📷Camera I use : amzn.to/2VSiruw
Favorite Lens: amzn.to/2KPDQ1a
Wide-angle: amzn.to/2SlPchR
My Tripod: amzn.to/2Yl6RtJ
My Multi-tool: amzn.to/2zGm5Pz
Favorite Shoes: amzn.to/3f5trfV
Everyone needs a snatchblock: amzn.to/2DMR4s8
🥽Goggle Up! : amzn.to/2zG754g
Also, if you’re interested in a Smarter Every Day shirt etc. they’re really soft and you can get there here: www.smartereveryday.com/store
Project Farm Tested Durability: de-visions.com/detail/video-HVJz7Gqn_SY.html
He tested other considerations here: de-visions.com/detail/video-89BkJF0kVyc.html
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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Warm Regards,

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  • 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! Destin

    SmarterEveryDaySmarterEveryDayVor 12 Tage
    • Turbulent flow is better than laminar flow

      Muhammed ZulfikharMuhammed ZulfikharVor 4 Stunden
    • Turbulent flow is better than laminar flow

      Muhammed ZulfikharMuhammed ZulfikharVor 4 Stunden
    • Turbulent flow is better than laminar flow

      Muhammed ZulfikharMuhammed ZulfikharVor 4 Stunden
    • Turbulent flow is better than laminar flow

      Muhammed ZulfikharMuhammed ZulfikharVor 4 Stunden
    • Turbulent flow is better than laminar flow

      Muhammed ZulfikharMuhammed ZulfikharVor 4 Stunden
  • I would call the sharp, sharp square the concave square. Just saying. Sorry if I sound rude, I'm not trying to be

    deathshooter 72deathshooter 72Vor 50 Minuten
  • Do you self-identify as a Dull Square or a Sharp Sharp Square?

    Paragliding GuysParagliding GuysVor 3 Stunden
  • Why did the chicken cross the road. Weed eater

    lol_nllol_nlVor 3 Stunden
  • 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

    DieselBoulderDieselBoulderVor 4 Stunden
  • In Australia we call it a whipper snipper

    steeltoecapthongssteeltoecapthongsVor 8 Stunden
  • 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

    Tapper21Tapper21Vor 10 Stunden
  • 6lb nylon fishing line

    Christopher CollinsChristopher CollinsVor 11 Stunden
  • I always heard weed whacker when I grew up in Seattle, and then I heard everybody call it a weed eater in San Diego.

    kibukunkibukunVor 11 Stunden
  • It’s a strummer boi

    AlanXDAlanXDVor 16 Stunden
  • 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 DE-visions at midnight... Cant help it. (Kietty, if you're reading this I'm sorry but not sorry... love you babe ;) ) LMK what you think!

    LinearAnalysisLinearAnalysisVor 17 Stunden
  • you forgot about grass cell wall integrity, not that you can account for that...

    Matthew TannerMatthew TannerVor 19 Stunden
  • it's a weed-eater. who laughed. ur dumb.

    Matthew TannerMatthew TannerVor 19 Stunden
  • I challenge you to make a video on differences in 'audiobook' vs 'reading hardcopy of the book' :-)

    Gladwin KurianGladwin KurianVor 20 Stunden
  • meat beater.

    RayRayVor Tag
  • I love Robert. What a wonderful dude.

    Kriste IsopahkalaKriste IsopahkalaVor Tag
  • Are the sounds real in the slow motion? They can't be, right?

    Kriste IsopahkalaKriste IsopahkalaVor Tag
  • This is probably the coolest slow mo I've seen.

    Kriste IsopahkalaKriste IsopahkalaVor Tag
  • 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. 😂

    Ken HagenKen HagenVor Tag
  • How short can the wavelength of the electromagnetic spectrum be? Is there a limit on how short the wavelength can be?

    Michael MundlinMichael MundlinVor Tag
  • The weed eater guy is such a cool archetype of an american worker lots of work pride and personality

    torrace12torrace12Vor Tag
  • the line the professional used was mounted on a more powerful weed eater so it would have straightened out completely?

    torrace12torrace12Vor Tag
  • professional sharp-sharp-square line needs to be soaked in water for a few days before using to get more flexibility and higher durability

    83N74M1N83N74M1NVor Tag
  • Strimmer?? What!?! No.. it's Trimmer! in Sweden at least!😁

    Super knullischSuper knullischVor Tag
  • Hey destin I think you would make a cool video about top fuel dragsters

    Jake SantangeloJake SantangeloVor Tag
  • Robert is gold! I would love to see a follow up test using all of the non-string attachments that are always being advertised.

    TheFaceofDoodTheFaceofDoodVor Tag
  • w̴̡̡̦͙͔̗͈̮̥͊́͐̉̚e̷̙̅e̶͉͈͋d̶̡͇̫̩͋͂̇̂͊́̅̀͜ ̵͙̤̭̝͉̻̝̠̖̓̋͊͜e̵̦̤̳̼͉̳͕̙͖̱̓͊̏ą̵̧̝̳̚͝͠t̶̠̫͍̳̓̏̿́͛̏̒̌͗͘e̴̳̓̒̀̍r̷͉̼̋̔͑̓̽̀

    we can gamewe can gameVor Tag
  • Whipper snipper gang rise up from down under.

    SpoodermanSpoodermanVor Tag
  • Here in Australia we call weed eaters Whippa Snippers

    Oli MooreOli MooreVor Tag
  • Why do the chicken cross the road?

    stocchinetstocchinetVor Tag
  • Wipper snipper in Australia

    Alyssa AndersenAlyssa AndersenVor Tag
  • Most people where I live here in ohio call it a weed whacker I dont think that data is very accurate. like how could it be anyway.

    Honey BBQ SauceHoney BBQ SauceVor Tag
  • If you think about it you can never actually touch anything because atoms cannot touch each other so if you give someone a high-five you don’t actually touch there hand

    Snowboarding Beast 07Snowboarding Beast 07Vor Tag
  • Just a comment about the twists on the lines. A tubular object when subjected to high air speed tends to wobble a lot. The twist breaks up the air turbulence thus making the object much more stable. You get to see that applied a lot on bridge cables.

    Γιάννης ΜεϊμάρηςΓιάννης ΜεϊμάρηςVor Tag
  • a string trimmer is a string trimmer regardless of what the majority want to call them. if the majority was to call a tornado a spiny boi, would that make "spiny boi" the correct term? i think not! and with how fast it spins the shape don't really matter all that much.

    Theldras PneumonoultramicroscopicsilicovolcanoconiosisTheldras PneumonoultramicroscopicsilicovolcanoconiosisVor Tag
  • Didn’t ProjectFarm already do something like this (just without the slo-mo, but more scientifically rigorous)? Ah, yeah, I see his link in the description 😂

    imapiefaceimapiefaceVor Tag
  • It’s so different hearing the words "weed eater". Never in my life have I heard that term until I started watching your videos. I call them "weed whackers"

    Ivy KueffnerIvy KueffnerVor Tag

    imapiefaceimapiefaceVor Tag
  • Star shape uses "tennis ball" air turbulence, that makes air to move away from cutting edge in result "sucking" grass to the cutting edge.

    Julius ZavatskisJulius ZavatskisVor Tag
  • Im from florida i call it a weed whacker

    luis martinezluis martinezVor Tag
  • In German it's called Rasentrimmer. I like my language somehow

    Starlord1103Starlord1103Vor Tag
  • Most Australians say whippa snippa

    DavoDavoVor 2 Tage

    Steve PSteve PVor 2 Tage
  • Just got hired doing weed whacking for my city, this is wonderful. For the record, we use sharp sharp square

    7Firefly77Firefly7Vor 2 Tage
  • I call it a weed wacker and a weed eater. Same thing it just kills weeds. Why cant it just be called a weed? Oh wait.....

    2K_YT2K_YTVor 2 Tage
  • first worl problems

    MrKoubakMrKoubakVor 2 Tage
  • Weed whacker is just so much more fun to say

    panda Wellspanda WellsVor 2 Tage
  • Why not the grass cutter??

    The EfXThe EfXVor 2 Tage
  • Robert is awesome!

    MrGreenAKAguci00MrGreenAKAguci00Vor 2 Tage
  • Hypothesis: The ad in this video is NordVPN

    Kookee PenguinsKookee PenguinsVor 2 Tage
  • Waiting for Robert to show up to help Dustin at the next Rocket facility tour to describe friction welding fuel tanks or optimal shapes for nose cones.

    Ken's ChannelKen's ChannelVor 2 Tage
  • I think the star shaped line getting cleaner cuts might just come down to the fact that it has more 'edges' so it has a higher chance of contacting the grass with a sharp shear angle.

    nanophreaknanophreakVor 2 Tage
  • New Zealand checking in, confirming "weed eater" is correct but they are called "line trimmers" in hardware stores.

    KiwiPokerPlayerKiwiPokerPlayerVor 2 Tage
  • Yeah its a weedeater... Everyone else is wrong... lol

    dewcodered88dewcodered88Vor 2 Tage
  • I’ve been skipping this video forever in my feed because I thought those were gummy candies. And I was like why do I care about gummy candies being hit by a weed eater

    Andy TAndy TVor 2 Tage
  • Robert should do hours long weed eater videos, he could get millions of subscribers from that I think.

    MerecirMerecirVor 2 Tage
  • That's rad :D

    B4D-W0LFB4D-W0LFVor 2 Tage
  • what i think about this experiment is that americans are f***en BORED in motha Russia, we call this thing a "trimmer". Because it doesn't eat grass or weed or bush - it doesn't eat at all. I-i-i-i-t tri-i-i-ims.....

    Дмитрий ХабаровДмитрий ХабаровVor 2 Tage
  • australia says whipper snipper budy

    mista bshemista bsheVor 2 Tage
  • Weed Whacker

    Kenneth ClarkKenneth ClarkVor 2 Tage
  • In the UK, it's very much a strimmer. "Weed eater" sounds simplistic and dumbed down to me.

    Axela MPSAxela MPSVor 2 Tage
  • Hi Aron, I like your videos and the way you explain the operation of physical phenomena, maybe you can help me with something that happened to me yesterday, one of our glasses (I don't know if it was glass or crystal) exploded spontaneously For no apparent reason, now my mom and I would like to know how this happened. I would very much like you to answer my question. Regards

    El CarasEl CarasVor 2 Tage
  • "he suggested that we weigh each line in a certain length and calculate it's linear density" He did what? Clearly got Audible in his ears for those 10hrs of weed eating he does a day! Cause I sure didn't think of that!

    GarfishGarfishVor 2 Tage
  • I'd like to see how the lines cut blades of grass that aren't tensioned. The bending of the grass against the line could affect the way it cuts.

    Sociopath MercenarySociopath MercenaryVor 2 Tage
  • It's Project Farm with SCIENCE and slow motion! Woot!

    Sociopath MercenarySociopath MercenaryVor 2 Tage
  • I live in Florida, and I've never heard the term weed eater even once! I've always known it as weed whacker

    LLTheGuyLLTheGuyVor 2 Tage
  • One thing you didnt test was durability of each line! High speed tests to see which has a higher vs lower point of failure.

    hypertionhypertionVor 2 Tage
  • Either weed eater or weed whacker, but mostly weed eater. Here in California

    Chris GuglielmoniChris GuglielmoniVor 2 Tage
  • I don't know what others call them, but I call them a lot of work for someone as lazy as I am!

    J. WilliamsJ. WilliamsVor 2 Tage
  • Neat video! After seeing the weight sample, I though for sure the heavier lien would have did the better job of cutting.........With that said, the high speed DON'T lie.

    PNW RCPNW RCVor 2 Tage
Which Shape CUTS BEST? (Weed Eater Line at 100,000 Frames Per Second) - Smarter Every Day 238