Wait. I’m confused. It says 67 grams on the website. Which one is it?
They must have corrected it haha!
Haha. This just makes it harder though, now that it’s not as heavy. And I also want a Draupnir, so I can’t pick. Oh well. There are worse things in life than deciding which 200 dollar yoyo you want! ;D
i believe the yyj patent only applies to when the outside rim is a different metal, and since the weight rings are on the inside, it doesn’t violate any patent
Here is direct quote from Yoyojam patent, I think it will not apply for Laser.
Does anyone have direct communications with Kengo Kido?
I’m still wanting to know what the Draupnir and Laser rims are actually made of.
Apparently i have different sources with contradictory answers and i’d really love to be factually accurate before i post my review.
Stainless steel. Only place saying differently was 28Spin guessing as far as I know. Don’t think there’s another likely material that could have the properties that the rims have shown with regards to tempering, lack of oxidation, weight, color, etc.
Thanks, Nathan. I had an exchange with 28Spin saying (from Kengo Kido) that the rims are of a different 7075 grade, coated with SS.
In which i think is quite improbable. My argument to them was density. They seemed quite adamant otherwise.
Could i also have objective input from any experts in the field?
I’d figure i’d end up with calculations and measurements, but it’s also nice to bolster the argument with expert feedback.
That seems ridiculous and impossible. Guessing something was lost in translation between YYR and them. Need someone to cut their Draupnir in half lol.
Could we please not get in an argument on someone cutting their 200 dollar yoyo in half again? Lol
No, no one’s gonna cut any yoyo in half.
I suppose a micrometer and a grain scale, together with some good use of math formulas could help determine density, based on volume and weight (ρ=m/V).
Anyone have one of these?
BTW: I agree with NathanC about the possibly of mis-translation.
Unless you can separate the parts, this will be impossible without the CAD drawings. If you can’t separate the two parts, you will have to figure out the weight of the overall design given the different possible components. Without precise measurements and a whole lot of calculus, this will be impossible unless you have the original CAD drawings and a computer.
A quick search doesn’t even show SS plating as a thing. You can plate SS with lots of things, but using it as plating over aluminum seems extremely unlikely. Not to mention how tight and seamless the fit is, just wouldn’t happen with coated parts. So many reasons it’s not likely.
I’m fairly confident there’s no such thing as steel coated aluminum.
By theory, you could use the process of elimination.
- I would start by one half of the yoyo, measure the total weight.
- Break it down into two parts, the rim and the body
- Our outcome should be (calculated rim mass + calculated body mass = total measured weight)
The rim
- get the circumference of the rim, the thickness and depth, and you have the volume (treat the rim like a long bar, L x W x D).
The body
-
the body itself is superbly tricky, but you could break them down to it’s individual components and still measure them with a micrometer and calliper to get the volume there as well.
-
given ρ=mV, we already have the volume (V),
-
we just replace the ρ values with already available data (e.g. 7075 = 2.810 g/cm³) to get the mass (m),
-
add the numbers up and see which is nearest to our weigh-in.
It might not be accurate, but we’re looking for what material is more likely to be used and the results can’t be too far off.
Well now i’m confused… If it was aluminum they’d just anodize it… Still think it’s SS.
Colors of tempered steel:
Draupnir:
It doesn’t really make sense to have a 7075 body with 7075 weight rings. Even if it’s a “different grade” 7075, surely the difference in mass would be negligable…?
It’s probably steel. Different grades? Then it wouldn’t be 2 7075
You can’t have different grades of the same grade. Haha 
I wrote to Vilmos about this. He told me he got this info this info about Draupnir directly from Kengo. Now I’m really confused, I think we should push Yoyorecration to make some official statement about material on their new yo-yos.
Do anyone remember, from where this info about steel rims first come?