Recently, there seems to be a pattern with yyf making specifically rim weighted models…
- Alta
- Edge beyond
- Singularity
- Overthrow
- MVP 3
- BiND
but which is the most powerful 
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Beyond
Singularity
Alta
BiND
MVP3
Overthrow
In that order
Keep in mind I have tried 0 of these models 
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Guessing blindly too, i’d say:
- BiND
- Overthrow
- Beyond
- Singularity
- Alta
- MVP3
While you’re not wrong, I’ve spent a lot of time looking into those extended ring models like the Alta, Haymaker X and Edge Beyond ect and I’ve found the weight isn’t as rim concentrated as you might think. The rims have a very thin extrusion so it looks impressive, but they have a much thicker seat which is where more weight is concentrated. You get more stability from the weight being further away from the center of gravity (which is the dead center point of the axle) rather than the axis that the axle sits on. I’ve created a few (rubbish) yoyo drawings to illustrate my point.
This is how the weight distro ends up looking in those extending ring bimetals.
The weight is concentrated across the rim, yes, but for ultimate performance, you want the weight as far away from the center of gravity as possible. The further away, the more performance you get for your precious grams of material.
For the same shape, this is a much more ideal design as the weight is concentrated further away from the center of gravity.
To contrast, this is what those bimetals end up looking like
And something like this ends up performing better because you have the rim much further away from the center. This is how the extreme yoyos like the draupnir and hummingbird work.
I’m not saying those yoyos don’t perform well, they absolutely do. I’m saying it’s an interesting topic to think about.
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Interesting, makes sense. The BiND must be hella rimweighted then. What are your thoughts on the execution of that one?
I slowly updated my reply, I don’t know if it matters to you lol.
The BiND just means you have a smaller ring for the sake of covering it up. I’d say it’s a much less efficient design.
It’s only important in terms of outright performance though. There are many other factors that come into play when you pick a yoyo, right? You want it to feel nice, look nice, play nice, go at a speed you’re comfortable with ect.
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In reply to the actual topic, I think YYF are shifting away from the safer designs they were known for. These rim weighty yoyos are much harder to make on a large scale because they’re much more likely to be vibey off the machines. More rim weight means inconsistencies are going to be further away from the center and more noticeable.
Gotta commend them for taking risks and going hard. Respect.
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I don’t think this is ideal at all - moving weight sideways away from the string plane doesn’t increase the moment of inertia around the principal axis of rotation, while instead increasing it along a different axis, which can make it prone to wobble.
Moving weight up (in your sketches) is what improves this aspect of performance (moment of inertia).
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@MarkD, that’s my understanding as well, based on studying the equations for gyroscopic force.
You’re right about the wobble, I agree. I was talking purely performance. This does raise the rim weight but I didn’t illustrate it well enough in my design. It would have been better illustrated had I changed the shapes to match a more perfect design but I tried to keep the shape the same across all drawings.
There’'s more too it than moment of inertia too. There wouldn’t be if we were just comparing spin times and how long it takes the yoyo to tilt/turn but yoyos spin on and between strings while moving and they play a major role in how the yoyo performs. A string hit at the edge of the yoyo if the concentrated rim weight is wider spread, it’s more likely to change plane ect. I’m struggling to find an eloquent way to put it but I hope you get my drift.
Basically if the weight is concentrated on each end, your whole catch zone is relatively safe from being nudged by string hits, but if it’s more central and you hit the outer rim, it’s more likely to tilt.
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I do think it’s cool that YYF is pioneering extreme metal rims that extend far outside the edge of the yo-yo. It started with the Alta, didn’t it? What was the first YYF model to have steel extending significantly beyond the alu rim?
I do think Overthrow might be the most rim weighted model out there. It is fun to throw, albeit a tad noisy due to its construction. Certainly an improvement over the 9 Dragons in my book 
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Nah, I get what you’re saying now. The question now would be how much of an impact on tilt-resistance weight at different locations actually has, and I think it’d be possible to model that mathematically. There are other factors too, like how steep the angle is of the rim where it hits - the steeper the angle, the less torque is applied to the yoyo. Yet another advantage the Draupnir has!
I definitely think angle plays a big part too. If I’m in the zone, I feel like I can feel when the string hits those bumps next to the response on yoyos like the 543 (vs the rest of the catch zone) because it’s flatter. Feels like there’s a little thud before the string hit. That could be in my head though.
Duncan had done it with the HMX but Japan had done it years before with the yoyomonster Agonists. The rim popped out a long way on those too. The Draupnir and Valk do a little bit too. YYF are just exaggerating it a lot, which I agree is very cool
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The order I listed is in chronological order
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Can you put release dates on them? I’m curious which was the first to do extended bimetal rims… Haymaker? And before that, this Japanese yo-yo that @chaosgow noted?
yoyomonster Agonist 1.0 and (new) agonist. There are actually 3 in the series (and a delrin model called the antagonist) but the first one is an inner brass ring called the Agonist, the second is an extended ring version called the Agonist 1.0 and the third is the (new) Agonist (yes the bracketed word new is included in the name lol) which is also an extended ring version. Both the extended ring versions also feature rings that are fused on and then another go on the machines to make the rim seam seamless. I’m not 100% clear on how that works but I owned all 3 and can tell you it has great results.
Here’s a picture of the 1.0 that I no longer have. You can see how far the rim extends and also how it looks from the profile
Edit to add the Hydrangea Laurus ($360 bimetal) is very similar in looks to the 1.0 and it has the same fused and remachined rims.
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Thanks for all of your enlightening posts! How hard is it for designers/companies to post the moment of inertia? Wouldn’t this be an important spec for consumers to know?
The numbers don’t exactly translate and wouldn’t make sense. It’s not like one yoyo has 100% and the other has 50% of it. If I told you the moment of Inertia of the 543 is 2.854E+04 (g mm^2) would you be able to tell if that’s better than the next yoyo that’s 3.157E+04 (g mm^2) ? It’s just a mess and adds meaningless numbers that people won’t be able to make sense of lol.
Playing the yoyo and deciding how much you like it is a far better way to gauge it.
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I can definitely understand that playing a yoyo is the best (only?) way to determine if you like it. But, much like diameter/width/weight and in combination with the other specs, wouldn’t it give us some indication of how much a given throw is rim weighted vs center weighted? In your experience, does MOI give any indication of play characteristics, particularly in comparison to other similar designs?
Thanks for taking the time to educate us on the subject.
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I don’t think it does translate. These numbers might translate to something in a vacuum but as I said before in this thread, yoyos are more than just numbers, it’s a combination of everything. The complete sum of its parts. They have to survive string hits and gryo flops and even just drag from spinning against the gasses in the air. I think weight, shape and size are the best indicators of if you’ll like a yoyo or not, everything else is just over thinking.