Comments by "ke6gwf - Ben Blackburn" (@ke6gwf) on "Which Shape CUTS BEST? (Weed Eater Line at 100,000 Frames Per Second) - Smarter Every Day 238" video.

  1. Some key points left out are that the size and weight of the line used has to be matched to the speed and power of the weedeater (Northern California person, and that's the most common name around here lol). As you showed previously, if you make the line too long it slows the motor down, and the same is true if you put a larger diameter or heavier line on than the motor can pull. So Robert's unit is most likely much more powerful than yours, and so would have no problem straightening that line out, and possibly also spins at a faster rpm. The other big reason for using different shape and style lines is line life. A round line will cut grass just about as well as an equivalent other shaped line, but it wears off on rocks and fences and such much faster. The shapes seem to give it a buffer or wear guard to protect the core longer against debris wear. It also can make a difference when getting into star thistle, blackberry vines, etc, where a round line just slides off, but a textured line digs in more, and doesn't wear as fast. I am basing this off experience and logic, so I could be wrong, but it's worth testing lol
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  2.  @someoneelse7629  it may be different on an electric one because of the instant torque, but I have had quite a few small to industrial 5hp with wheels string trimmers, and I always tested to see what weight line would work without slowing it down. You can get up to speed, but how long does it take to recover after hitting something? With a gas engine it makes a difference. So you run smaller line if you are cutting grass etc, because you can cut faster and keep a higher rpm, and recover speed faster after bogging down, and if you are in heavier material, you go to larger line, but have to wait between sweeps to get back to speed.
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