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: noburn.info/id/video/roqtq5t4oaaXioo.html
He tested other considerations here: noburn.info/id/video/nm2lnK53YKOOsJQ.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,
Vitenskap og teknologi
Runtime: 16:54


SmarterEveryDay - 14 dager siden
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 https://www.patreon.com/smartereveryday
Thank you!
Muhammed Zulfikhar
Muhammed Zulfikhar - 2 dager siden
Turbulent flow is better than laminar flow
Muhammed Zulfikhar
Muhammed Zulfikhar - 2 dager siden
Turbulent flow is better than laminar flow
Muhammed Zulfikhar
Muhammed Zulfikhar - 2 dager siden
Turbulent flow is better than laminar flow
Muhammed Zulfikhar
Muhammed Zulfikhar - 2 dager siden
Turbulent flow is better than laminar flow
Muhammed Zulfikhar
Muhammed Zulfikhar - 2 dager siden
Turbulent flow is better than laminar flow
Joseph Dow
Joseph Dow - Time siden
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 - 4 timer siden
I like the way aussies say weed wacker, “whipper snipper”😂
masteradvance - 6 timer siden
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 ! - 12 timer siden
On the west we call it weed whacker lmao
JackyBoy Slim
JackyBoy Slim - 12 timer siden
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 - 13 timer siden
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 - 16 timer siden
Weed eater? wE hArDlY eVeN knOw hEr
axeman098 - 16 timer siden
Nitrodasnipa Z
Nitrodasnipa Z - 18 timer siden
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 - 19 timer siden
Robert is a nice guy !
Darron Freels
Darron Freels - 19 timer siden
I want to know the science behind why batteries drain/die when laid on concrete for an amount of time
Waffle Duck
Waffle Duck - 21 time siden
... Why did the chicken cross the road
choirboy25 - 21 time siden
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 - 21 time siden
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. - 21 time siden
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 - 21 time siden
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 - 23 timer siden
This is the answer to my question. Thanks
Christopher Worthington
Christopher Worthington - 23 timer siden
Can we see a video on the physics of the movement of snakes?
Logan Trimmer
Logan Trimmer - 23 timer siden
I actually do call it a weed whacker and I live in PA so that seems to be true
Lucas Johnson
Lucas Johnson - Dag siden
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 - Dag siden
@SmarterEveryDay- destin how can we get ahold of you for videos ideas?
Havana Woody
Havana Woody - Dag siden
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 - Dag siden
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 - Dag siden
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 - Dag siden
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 - Dag siden
Thumbs up for Weedeater Guy. That dude is humble and knows a thing or two ;)
arthurneddysmith - Dag siden
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 - Dag siden
Nope. In my state of Australia, we call it a "weed whacker".
SRT8Ace PSVR - Dag siden
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 - Dag siden
hire the dude!
Junior LEGO Master
Junior LEGO Master - Dag siden
I call it a wipper snipper
Ramon - Dag siden
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 - Dag siden
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 - Dag siden
Please say weed wacker next video
SassyBashir - 2 dager siden
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
That’s a lot of Sodium - 2 dager siden
I thought it was weed wacker
deathshooter 72
deathshooter 72 - 2 dager siden
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 - 2 dager siden
Do you self-identify as a Dull Square or a Sharp Sharp Square?
lol_nl - 2 dager siden
Why did the chicken cross the road.

Weed eater
DieselBoulder - 2 dager siden
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 - 2 dager siden
In Australia we call it a whipper snipper
Tapper21 - 2 dager siden
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
Christopher Collins - 2 dager siden
6lb nylon fishing line
kibukun - 2 dager siden
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 - 2 dager siden
It’s a strummer boi
LinearAnalysis - 2 dager siden
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 YouTube 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 - 2 dager siden
you forgot about grass cell wall integrity, not that you can account for that...
Matthew Tanner
Matthew Tanner - 2 dager siden
it's a weed-eater. who laughed. ur dumb.
Gladwin Kurian
Gladwin Kurian - 2 dager siden
I challenge you to make a video on differences in 'audiobook' vs 'reading hardcopy of the book' :-)
Ray - 3 dager siden
meat beater.
Kriste Isopahkala
Kriste Isopahkala - 3 dager siden
I love Robert. What a wonderful dude.
Kriste Isopahkala
Kriste Isopahkala - 3 dager siden
Are the sounds real in the slow motion? They can't be, right?
Kriste Isopahkala
Kriste Isopahkala - 3 dager siden
This is probably the coolest slow mo I've seen.
Ken Hagen
Ken Hagen - 3 dager siden
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 - 3 dager siden
How short can the wavelength of the electromagnetic spectrum be? Is there a limit on how short the wavelength can be?
torrace12 - 3 dager siden
The weed eater guy is such a cool archetype of an american worker
lots of work pride and personality
torrace12 - 3 dager siden
the line the professional used was mounted on a more powerful weed eater
so it would have straightened out completely?
83N74M1N - 3 dager siden
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 - 3 dager siden
Strimmer?? What!?! No.. it's Trimmer! in Sweden at least!😁
Jake Santangelo
Jake Santangelo - 3 dager siden
Hey destin I think you would make a cool video about top fuel dragsters
TheFaceofDood - 3 dager siden
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 - 3 dager siden
w̴̡̡̦͙͔̗͈̮̥͊́͐̉̚e̷̙̅e̶͉͈͋d̶̡͇̫̩͋͂̇̂͊́̅̀͜ ̵͙̤̭̝͉̻̝̠̖̓̋͊͜e̵̦̤̳̼͉̳͕̙͖̱̓͊̏ą̵̧̝̳̚͝͠t̶̠̫͍̳̓̏̿́͛̏̒̌͗͘e̴̳̓̒̀̍r̷͉̼̋̔͑̓̽̀
Spooderman - 3 dager siden
Whipper snipper gang rise up from down under.
Oli Moore
Oli Moore - 3 dager siden
Here in Australia we call weed eaters Whippa Snippers
stocchinet - 3 dager siden
Why do the chicken cross the road?
Alyssa Andersen
Alyssa Andersen - 3 dager siden
Wipper snipper in Australia
Honey BBQ Sauce
Honey BBQ Sauce - 3 dager siden
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
Snowboarding Beast 07 - 3 dager siden
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 - 3 dager siden
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 - 3 dager siden
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 - 3 dager siden
Julius Zavatskis
Julius Zavatskis - 3 dager siden
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 - 3 dager siden
Im from florida i call it a weed whacker
Starlord1103 - 3 dager siden
In German it's called Rasentrimmer. I like my language somehow
Davo - 4 dager siden
Most Australians say whippa snippa
Steve P
Steve P - 4 dager siden
7Firefly7 - 4 dager siden
Just got hired doing weed whacking for my city, this is wonderful. For the record, we use sharp sharp square