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Can someone explain to me why some discs are rated differently in different plastics and others not? Like the X XL is 1.0, ESP is 1.2, and Z XL is 1.5? Do they really fly different in each plastic?
Most and disc from any company will fly differently from one plastic to another. For example Champion/Z/Opto... tend to me the most overstable for most disc. Its most noticeable in drivers then mids and putters.
Better Contact each manufacture Directly and ask them.
I wish someone would make a chart that had all the current discs out listed with a universal stability rating system
I think that there is a chart somewhere. Just can't remember where at the moment.
But even that chart uses the manufacturer's rating system.
Try this chart Adam:
It's pretty good!
A little late to the party, but this should help:
The best flight chart, in my honest opinion, is the marshall street chart.
From purely an X vs. Y / distance vs. net stability perspective, it's the only thing like it out there (at least for now) and we like it a lot too from that standpoint. That said, check out the third quote down:
I know the plastic type affects the stability, but I don't know the science behind it. There is probably something about the density of the plastic and it's aerodynamics. Part of it might be the difference in durability. A TI or an ESP buzzz is obviously going to maintain it's stability for far longer than an X or D model would. I haven't seen this with Discraft discs, but one Innova model that stands out to me is the Katana. I have that driver in both pro and star plastic. The pro model is more domey, and much flipper, while the star model has a much flatter top, and is crazy overstable in comparison... Like I can only really sidearm it. I'm not really sure why this is, but it's the best example I can think of with different flight characteristics from the same model in diff plastics.
Pro Katana is less stable. Star Katana (flat top) is more stable.
You will usually see more extreme differences in the drivers since the cooling process with different plastics can cause the center to pull up and lift the outer wing. After everything comes to room temp, the z/champ plastic will often have a higher PLH. Of course, sometimes you will see the fancy plastic droop a bit as well causing a lower PLH. Which I often attribute to the super flippy lemons you hear folks talk about.