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

Summary by Krater

Smarter Every Day tests various weed eater string shapes under a microscope and high-speed camera, concluding that star-shaped and sharp square lines provide the cleanest cuts while star lines are best for thin grass.

From the video

Answers: Which weed eater string shape cuts grass best?

• weed eater line shapes
• microscope analysis of trimmer line
• high-speed camera grass cutting
• weed trimmer string comparison
• linear density of trimmer line

What it concludes

• Twisted triangular trimmer lines are quieter because they induce turbulence and reduce wind noise, similar to spiral car antennas.
• Star-shaped trimmer lines create remarkably clean cuts on grass.
• Dull square trimmer lines rip through grass, causing it to delaminate vertically rather than cutting straight through.
• For thin grass around the house, star-shaped lines are recommended because they cut cleanly and offer better control.
• For heavy brush, obstacles, and trees, sharp square lines are recommended because they are heavier and more durable while still tracking well.