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-vid.com/video/video-HVJz7Gqn_SY.html
He tested other considerations here: de-vid.com/video/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,

Wissenschaft & Technik



28 Jun 2020



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SmarterEveryDay Vor 12 Tage
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
Muhammed Zulfikhar
Muhammed Zulfikhar Vor 18 Stunden
Turbulent flow is better than laminar flow
Muhammed Zulfikhar
Muhammed Zulfikhar Vor 18 Stunden
Turbulent flow is better than laminar flow
Muhammed Zulfikhar
Muhammed Zulfikhar Vor 18 Stunden
Turbulent flow is better than laminar flow
Muhammed Zulfikhar
Muhammed Zulfikhar Vor 18 Stunden
Turbulent flow is better than laminar flow
Muhammed Zulfikhar
Muhammed Zulfikhar Vor 18 Stunden
Turbulent flow is better than laminar flow
SRT8Ace PSVR Vor 21 Minute
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 Vor 5 Stunden
hire the dude!
Junior LEGO Master
Junior LEGO Master Vor 6 Stunden
I call it a wipper snipper
Ramon Vor 6 Stunden
We can say "trimmer" in Russia, but it has similar pronunciation with "streamer". Well, we usually say "газонокосилка" instead of "триммер"
Manusinh Rahevar
Manusinh Rahevar Vor 9 Stunden
Hi, 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 Vor 10 Stunden
Please say weed wacker next video
SassyBashir Vor 11 Stunden
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 Vor 14 Stunden
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
Paragliding Guys Vor 16 Stunden
Do you self-identify as a Dull Square or a Sharp Sharp Square?
lol_nl Vor 17 Stunden
Why did the chicken cross the road. Weed eater
DieselBoulder Vor 18 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
steeltoecapthongs Vor 21 Stunde
In Australia we call it a whipper snipper
Tapper21 Vor 23 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
Christopher Collins
6lb nylon fishing line
kibukun Vor Tag
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 Vor Tag
It’s a strummer boi
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-vid 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
you forgot about grass cell wall integrity, not that you can account for that...
Matthew Tanner
it's a weed-eater. who laughed. ur dumb.
Gladwin Kurian
I challenge you to make a video on differences in 'audiobook' vs 'reading hardcopy of the book' :-)
Ray Vor Tag
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 Vor 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. 😂
Michael Mundlin
How short can the wavelength of the electromagnetic spectrum be? Is there a limit on how short the wavelength can be?
torrace12 Vor Tag
The weed eater guy is such a cool archetype of an american worker lots of work pride and personality
torrace12 Vor Tag
the line the professional used was mounted on a more powerful weed eater so it would have straightened out completely?
83N74M1N Vor 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
Super knullisch
Strimmer?? What!?! No.. it's Trimmer! in Sweden at least!😁
Jake Santangelo
Hey destin I think you would make a cool video about top fuel dragsters
Robert is gold! I would love to see a follow up test using all of the non-string attachments that are always being advertised.
we can game
we can game Vor Tag
w̴̡̡̦͙͔̗͈̮̥͊́͐̉̚e̷̙̅e̶͉͈͋d̶̡͇̫̩͋͂̇̂͊́̅̀͜ ̵͙̤̭̝͉̻̝̠̖̓̋͊͜e̵̦̤̳̼͉̳͕̙͖̱̓͊̏ą̵̧̝̳̚͝͠t̶̠̫͍̳̓̏̿́͛̏̒̌͗͘e̴̳̓̒̀̍r̷͉̼̋̔͑̓̽̀
Spooderman Vor 2 Tage
Whipper snipper gang rise up from down under.
Oli Moore
Oli Moore Vor 2 Tage
Here in Australia we call weed eaters Whippa Snippers
stocchinet Vor 2 Tage
Why do the chicken cross the road?
Alyssa Andersen
Alyssa Andersen Vor 2 Tage
Wipper snipper in Australia
Honey BBQ Sauce
Honey BBQ Sauce Vor 2 Tage
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.
Snowboarding Beast 07
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
Γιάννης Μεϊμάρης
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.
Theldras Pneumonoultramicroscopicsilicovolcanoconiosis
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.
imapieface Vor 2 Tage
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 😂
Ivy Kueffner
Ivy Kueffner Vor 2 Tage
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"
imapieface Vor 2 Tage
Julius Zavatskis
Julius Zavatskis Vor 2 Tage
Star shape uses "tennis ball" air turbulence, that makes air to move away from cutting edge in result "sucking" grass to the cutting edge.
luis martinez
luis martinez Vor 2 Tage
Im from florida i call it a weed whacker
Starlord1103 Vor 2 Tage
In German it's called Rasentrimmer. I like my language somehow
Davo Vor 2 Tage
Most Australians say whippa snippa
Steve P
Steve P Vor 2 Tage
7Firefly7 Vor 2 Tage
Just got hired doing weed whacking for my city, this is wonderful. For the record, we use sharp sharp square
2K_YT Vor 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.....
MrKoubak Vor 2 Tage
first worl problems
panda Wells
panda Wells Vor 2 Tage
Weed whacker is just so much more fun to say
The EfX
The EfX Vor 2 Tage
Why not the grass cutter??
MrGreenAKAguci00 Vor 2 Tage
Robert is awesome!
Kookee Penguins
Kookee Penguins Vor 2 Tage
Hypothesis: The ad in this video is NordVPN
Ken's Channel
Ken's Channel Vor 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.
nanophreak Vor 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.
KiwiPokerPlayer Vor 2 Tage
New Zealand checking in, confirming "weed eater" is correct but they are called "line trimmers" in hardware stores.
dewcodered88 Vor 3 Tage
Yeah its a weedeater... Everyone else is wrong... lol
Andy T
Andy T Vor 3 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
Merecir Vor 3 Tage
Robert should do hours long weed eater videos, he could get millions of subscribers from that I think.
B4D-W0LF Vor 3 Tage
That's rad :D
Дмитрий Хабаров
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.....
mista bshe
mista bshe Vor 3 Tage
australia says whipper snipper budy
Kenneth Clark
Kenneth Clark Vor 3 Tage
Weed Whacker
Axela MPS
Axela MPS Vor 3 Tage
In the UK, it's very much a strimmer. "Weed eater" sounds simplistic and dumbed down to me.
El Caras
El Caras Vor 3 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
Garfish Vor 3 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!
Sociopath Mercenary
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 Mercenary
It's Project Farm with SCIENCE and slow motion! Woot!
LLTheGuy Vor 3 Tage
I live in Florida, and I've never heard the term weed eater even once! I've always known it as weed whacker
hypertion Vor 3 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.
Chris Guglielmoni
Either weed eater or weed whacker, but mostly weed eater. Here in California
J. Williams
J. Williams Vor 3 Tage
I don't know what others call them, but I call them a lot of work for someone as lazy as I am!
PNW RC Vor 3 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.
The crap adventures of Che Simons
Whipper snipper in Australia mate I don't think it's about clean cuts so much as how long your cord lasts in area of grass cut, ie cost per meter squared in both dollars and minutes.
Donovan Halstead
Donovan Halstead Vor 3 Tage
Robert's hat is awesome. What is it?!
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