Plastic Yo-yo's and noise

I have a question that hopefully, a yo-yo designer; or just somebody who knows more about how yo-yo’s work can answer.

Why do some plastic yo-yo’s make almost no sound; while some hiss like an angry rattlesnake? My YYR Diffusion is whisper-quiet while my YYR Trident although a brilliant yo-yo in every respect; is very loud in comparison. I have swapped and lubed the bearings, so that is not it. Both are made from the same plastic, so it must be something in the way the bearing assembly is designed or some property of a rim-weighted design?

The same contrast can be drawn with the sOMEThING Addiction vs. OneDrop Rally. Both have similar performance and construction, but one is significantly louder than the other. Why?

Where is this noise coming from? Why don’t designers make all plastic yo-yo’s quiet?

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At least in part it has to do with sound amplification. It is not an ‘intentional thing’ but certain configurations are more suceptible to generating extraneous sounds.

Harmonics are at times more evident when factors align to assist in sound generation.

Some plastic yoyo molds are thinner/smoother/less complex than others. Most obvious in see through yoyos. Sometimes the molds have a multitude of reinforcement ribs, etc. this formation allows the plastic bodies to be much thinner in spots than others. Often this contrast in ‘thickness’ is the perfect breeding ground for amplification of sound/noise.

On the other end of the complex mold spectrum, consider the Freehand yoyo. Ever take one apart? Pop out the sidecaps and what do you see… An almost continuous thickness of polycarbonate material. The Duncan Freehand halves have ‘no’ thin spots in the molded part; limiting sound generation and actually killing potential noise. < That being said, the Freehand can still generate quite a Racket because the hollow sidecaps are noise generators. Some Freehand with glued in caps are dead silent. Others with pressed in caps or loose caps wail like a Banshee, lol.

Different plastics used in some yoyos, compounded by the various complexity of the molds open up the potential for assorted levels/degrees of sound pollution.

If the plastic yoyo mold exhibits thin and thick transitions of material; the potential for a ‘sound maker’ increases.

And whether it is a plastic body/metal rim or plastic body/plastic rim; the config… of the body combined with the different density of the rings can contribute to the amplified sound equation.

This effect can be further enhanced if the yoyo is kinda vibey. Any inherent imbalance in the yoyo itself on the throw down will direct that said vibration to the thinnest areas of the plastic yoyo body and manifest as noise.

Notice some smooooth yoyos still have a ‘hollow’ feel/and/or sound.

In contrast some vibe generating yoyos are also sound generating yoyos.

Often it is at least a few factors that unintentionally work together to end in a Noisy mess of a yoyo, haha.



It’s the same thing with metals. Some are louder than others.

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Bearing as well…If a bearing is more dry in 1 yoyo than another, it will be louder. My Diffusion actually makes a little noise.

I’ve noticed Triads are a little loud as well, I always attribute it to all the little cutouts molded into the side of the rims. From my experience anything like that just causes more noise, the IYYC Breathe comes to mind. The cutouts increase air resistance and make more noise.