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

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10 days ago

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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
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Project Farm Tested Durability: usshow.info/watch/HVJz7Gqn_SY/video.html
He tested other considerations here: usshow.info/watch/89BkJF0kVyc/video.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,

SmarterEveryDay 10 days ago
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
Jack Saggers
Jack Saggers 10 hours ago
Its called a whipper snipper
pigeons221 Day ago
Can you do a video of how birds eat in slow motion? Birds eating food are very quick to the naked eye and we do not know how fast they do that.
Andreas Hontzia
Andreas Hontzia 2 days ago
Don't be afraid as a scientist to interview people, who practically perform your field of study every day. It is a win-win situation. You both will learn from each other. I did this a lot and must say: They will tell you the edge case, you won't have thought of in a life time.
Ahmed el shorbagy
Ahmed el shorbagy 3 days ago
Dear destin thanks for the wonderful easy knowledge, I really want a video about starlink vs Internet of thing's vs smart house vs smart cars what is the plan how life will be after 80 % of this evolution
MM's Visible Confusion
MM's Visible Confusion 3 days ago
I litterally live in the same town as you
The EfX
The EfX Hour ago
Why not the grass cutter??
MrGreenAKAguci00 2 hours ago
Robert is awesome!
Kookee Penguins
Kookee Penguins 2 hours ago
Hypothesis: The ad in this video is NordVPN
Ken's Channel
Ken's Channel 3 hours ago
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 3 hours ago
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 4 hours ago
New Zealand checking in, confirming "weed eater" is correct but they are called "line trimmers" in hardware stores.
dewcodered88 7 hours ago
Yeah its a weedeater... Everyone else is wrong... lol
Andy T
Andy T 8 hours ago
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 8 hours ago
Robert should do hours long weed eater videos, he could get millions of subscribers from that I think.
B4D-W0LF 8 hours ago
That's rad :D
Дмитрий Хабаров
Дмитрий Хабаров 9 hours ago
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 10 hours ago
australia says whipper snipper budy
Kenneth Clark
Kenneth Clark 11 hours ago
Weed Whacker
Axela MPS
Axela MPS 13 hours ago
In the UK, it's very much a strimmer. "Weed eater" sounds simplistic and dumbed down to me.
El Caras
El Caras 13 hours ago
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 13 hours ago
"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
Sociopath Mercenary 14 hours ago
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
Sociopath Mercenary 14 hours ago
It's Project Farm with SCIENCE and slow motion! Woot!
LLTheGuy 14 hours ago
I live in Florida, and I've never heard the term weed eater even once! I've always known it as weed whacker
hypertion 15 hours ago
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
Chris Guglielmoni 15 hours ago
Either weed eater or weed whacker, but mostly weed eater. Here in California
J. Williams
J. Williams 18 hours ago
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 18 hours ago
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
The crap adventures of Che Simons 20 hours ago
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 20 hours ago
Robert's hat is awesome. What is it?!
Alex Kairis
Alex Kairis 21 hour ago
My NJ dialect hurts me so much now.
Nicolas Quijano
Nicolas Quijano 21 hour ago
weed eater
Redakes 21 hour ago
Being from Michigan I can personally agree that we call it Weed Whacker and weed whip
Ask to seduce Miss
Ask to seduce Miss 21 hour ago
"What is the solution to the equation 2 + 2?" "I dunno. What does 2 + 2 equal?" robotic noises "W E E D E A T E R"
Ask to seduce Miss
Ask to seduce Miss 21 hour ago
just focusing on the 'virgin' shape of the line and the real test is to see how it cuts as it wears down too - this would add complications to your experiments though. Also, Oreg
Unfiltered Reality
Unfiltered Reality 22 hours ago
You're getting into Project Farm territory here, careful! ^^
C4PT41N P5YCH0 23 hours ago
6:58 did- did you just say interestring??
Joshua Charlery
Joshua Charlery Day ago
Weed Wacker**
Jarrett L
Jarrett L Day ago
I use star i think or its a plus
TheREALHelly Day ago
weed whacker or whipper snipper.... this is coming from a young whipper snapper
Der Kommentarschreiber360
Der Kommentarschreiber360 Day ago
I think it would be interesting to see what it looks like when somebody pops a lens out of their eje in slowmo
Jynxer JOHNSTON Day ago
I ran a stihl 450 fs for 3 years 10 hours a day. I have used every kind of blade from a the star to a skill saw blade to cut down 8 inch tree trunks. We would use string line. it really depends on the shape of the line and the density of the brush you would cut to go with what shape of line we would use.. At the end of the is also traveling slower then the inner part of the line. The star moves air evenly and cuts better because the speed at the end of the line is distributes the power from the center out is distributed quicker and more evenly.
Dudu Day ago
In Quebec some call it a ''fouet a gaz'', which literally translates to gas-powered whip
Pekka Puupää
Pekka Puupää Day ago
Buy oregon's unique saw side line.... It is good. 😉
Karl the Pagan
Karl the Pagan Day ago
7:05 turbulent flow is the best! Just trying to stir up your beef with Derek a little more. ;)
Pavel Rak
Pavel Rak Day ago
We call it in Czech "křovinořez" 😁 most important for me is durability, not the shape 👍 Exchange in half of work sucks 😁
Trevor Hewitt
Trevor Hewitt Day ago
I just learned from a reddit post that lawn mowers actually create lift which pulls grass blades upright so they can be cut. Do you think this is another factor to consider in weed whacker lines?
Michael Russell
Michael Russell Day ago
In Australia its called a whipper snipper or Whippa Snippa....strimmer is never ever used in Australia.
Ian Manners
Ian Manners Day ago
Things that cut get dull, things that smash are already dull. Smashing/tearing the grass is the answer imo.
Duncan Cayenne-McCall
Duncan Cayenne-McCall Day ago
Im a wead wacker guy
Mike V
Mike V Day ago
Weed Whacker Army here; recruiting members.
Adam Pike Collegeman
Adam Pike Collegeman Day ago
get a digital tachometer used to measure r/c airplane propeller rpm, then test how fast each type of string is spinning at the cutting area to see if that is different and or a performance factor
Morris Minor
Morris Minor Day ago
There's an extra factor that you haven't considered here. I use Oregon Starline and have noticed that it doesn't retain its shape and then break - in use the 'points' wear down until you are left with a thin cross-section at the very end of the line before it eventually breaks, so it is really acting as a combination of thin roundline and thicker starline. Here you are just focusing on the 'virgin' shape of the line and the real test is to see how it cuts as it wears down too - this would add complications to your experiments though. Also, Oregon Starline has five points and the one you have here has seven. I would expect that too many points makes the line start to act more like it is a round line, ie the spaces are as important as the points
Hunter Borman
Hunter Borman Day ago
Use me as a "Weed Whacker" button
Martin Johnson
Martin Johnson Day ago
if you had a 2mm circle, and 2mm star line, would the star not go blunt and turn into a circle, with a smaller circumference than 2mm, before it breaks? (same with all shapes). We wont see the line going blunt while only cutting 3 blades of grass, I feel like circle line must be the way to go, when cutting on a larger scale due to it holding it's shape for longer.
toomdog Day ago
You know what I saw? They all went through the grass. My takeaway is to buy the one that breaks the least (most durability per dollar). Kind of disappointed you didn't address that too, Destin
Dohan R
Dohan R Day ago
Most call it a "weed eater" in South Africa as well.
M Scott Johnson
M Scott Johnson Day ago
Wee Deeder. It's called a wee deeder.
Sí Mon
Sí Mon Day ago
I’ve been all over the us and I don’t know anyone who doesn’t call it a weed whacker.
Scott Gartner
Scott Gartner Day ago
Please publish which line was the quietest. Frankly, they all cut the grass, so I would think noise level would be a very important variable.
Yazmeli Ayzol
Yazmeli Ayzol Day ago
Weed whacker is a very Canadian term...
XxAlphaBunnyXx -
XxAlphaBunnyXx - Day ago
It’s 2 in the morning and I’m laying here watching a man cut grass in slow mo. What has my life come to 🤷🏼‍♂️
S Gill
S Gill Day ago
In Ontario Canada we call it a weed wacker. Never heard the other terms before today.
Matt R
Matt R Day ago
in Oz we kinda call them whipper snippers haha
Shadowidk Day ago
I’m in Texas and call it weed wacker
Edward's Sisters'Hands
Edward's Sisters'Hands Day ago
Choose express VPN so your ISP and communist government will never know which trimmer line you prefer!!!
Brawl Stars Pro Tips
Brawl Stars Pro Tips Day ago
Love seeing you guys nerd out over weed eater lines
Brian Brissette
Brian Brissette Day ago
ROBERT, YOU DESERVE A SHOUT OUT,,, as you become smarter every day 🤩BB
Christian Aguilar
Christian Aguilar Day ago
I thought everyone called it a weed wacker. I guess only my town says it
Bauer Gaming
Bauer Gaming Day ago
We all know it’s a weed wacker not a weed eater
J.DEN Day ago
My partner from California calls it a weedwhacker and has never heard the term “weed eater” in their life
Michael Ravetti
Michael Ravetti Day ago
Always a sharp edge on a star shape to drag into the leaf. It's why twisted wire can cut you so easily.
Spooky Day ago
The only I can think of off the eye on top of velocity is there's a dual mixture of vectors and stress points. The star having multiple points has a higher chance of striking with a an out dia. cutting edge while having more tightly compact vectors to channel mass, which is why the sharp sharp square pulls plugs and even though the star does too they're totally decimated. The grass simply can't handle that many points of impact and separation at such a high velocity. Like a unidirectional blender were all the blades cut and pulverized at once vs a sharpened icecream scoop
Mark Young
Mark Young Day ago
Interesting, as always, but I think the tests would be more valid WITHOUT TENSION on grass blades. I'd like to see some of the other scary accessories (maybe no longer made) w/ pieces of chainsaw chain swinging around madly for cutting thick weeds/brush.
bofooit gojo
bofooit gojo Day ago
As a Lowe's worker, I'm just impressed at how clean/stocked their seasonal department is right now
bofooit gojo
bofooit gojo Day ago
try the Echo speed-feed 400 trimmer head. I love mine, put it on another brand of trimmer.
Michael W.
Michael W. Day ago
The star shape one looks like the best one.
Giuzeppe Edrei Meimban
Giuzeppe Edrei Meimban Day ago
This gives me the Project farm vibes XD
LIL-Slavic Day ago
I’m in Michigan, but me and my friends call it grass trimmer
JoeyMac Day ago
FYI, the spiral antenna thing is, as I understand it, to break up the frequencies of shedding vortexes so they don't resonate together. As with many dynamic systems, natural system frequencies are to be avoided. Basically the car drives down the road, and at certain speeds, the antenna will experience shedding vortexes that match the first natural mode frequency of the antenna (or some multiple thereof) and the antenna ends whips left to right as the car drives forward. Without the spiral wrap, the frequencies along a length of antenna of similar cross section can happen synchronously and then act on the antenna body as a uniform coherent load. This can cause fatigue and destroy antennas. It's actually pretty cool to watch a plain round antenna whip sideways relative to the vehicle motion for the first time (after you realize why it's doing it)... although I'm a nerd so maybe it's not that cool... If you want to "visualize" shedding vortexes as they roll off a round rod in the wind, look at a flag on a pole. The flag waving motion is literally the vortexes rolling off the flagpole and moving the flag at that frequency. The frequency of shedding vortexes correlates to fluid (air) density, velocity, and the beam cross section. Some cars even use sensors to measure the frequency of shedding vortex within the air intake manifold to calculate mass airflow into the engine (for fuel mix ratio mapping). Shedding vortexes are also a big component in Lab-on-a-Chip micro-fluidic devices. Neat stuff. Anyways, the spiral wrap just breaks up the coherency of the frequencies along the antenna beam so they can't act in unison and whip the antenna around. An alternative method to the spiral wrap is to have an antenna of varying cross sectional thickness from base to tip... which is the primary wind-bucking mechanism used by those old electronic telescoping retracting antennas from the 90s (fat at the base and skinny at the tip).
TheFerrariGuy458 Day ago
In Canada it’s weed wacker
Gustajuy Day ago
Robert seriously just showed up and dropped mad knowledge then dipped What a madman
Joe Meyer
Joe Meyer Day ago
@2:18 get those wire nuts in a junction box
Austin G.
Austin G. Day ago
Grew up calling it a weed wacker, then got a groundskeeping job and was taught to call it a string trimmer
Sambaillley Day ago
Hi smarter every day. I've whatsh you're videos for e while now and I'm a big fan of what you do! Every morning when I wake up I make a coffee. And I do this thing wher I tapp the bottom of the glass and the sound it makes getts higher and higher until I mix the coffee and then it goes to normal sound, it has to be a glas or a mug. I don't know why or how it does it and I would love if you culd find out how its possible! Thanks
Nick Morris
Nick Morris Day ago
Lol Michigander here, definitely a weed whacker
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