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Why does the FLX plastic make the mold more overstable. Such as the FLX XL's and the FLX Flash that you threw? And is this fact what is keeping more discs from coming out in the FLX plastic?
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That FLX Flash must have been missed stamped; it was more like a Flick/Pred. The first run FLX XL's were stable pigs, but i recently got an email saying Discraft fixed that problem and now they are flying like XL's.
I'm no scientist so i can't really say for sure why certain plastics make discs more or less stable. This reminds me of a conversation i had with Barry though. I asked him why Pro-D (DX) discs seem to fly further than elite-Z (champion) discs. His answer was b/c in flight the Pro-D type plastic flattens out more (due to all of the forces applied) than the elite-Z type plastics. He went on to say that this flattening helps the disc achieve better glide/understability/distance. Maybe the FLX stuff doesn't flatten as much as the Z stuff which doesn't flatten as much as the Pro-D.
To add to what Discspeed posted, maybe the surface friction is what flattens these discs. Who knows? 
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Great post.
I have thought the same thing. This still does not explain why the old really strong and stiff (D) DX would glide like mad also. I think most of the improved performance in cheap plastic is how poorly it molds. The edges are all rounded off and smooth directly out of the mold compared to the premium plastics. As the premium discs wear sufficiently, they start to fly very similarly to the DX (D) plastics.
The FLX disc are "skinny". Look at the Predator from the side and compare the Z to the FLX. The FLX Pred is nearly 1/4" thinner if both are set on a table. This lower profile creates less drag and more speed.
The Z Flash for example is super fast because of its thinner profile compared to the ESP, but the ESP is more predictable. I have Z Flash that is as fast as a Destroyer.
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Actually, when I've buffed flashing off Inferno's, the disc is moving at much higher RPMs than humans can produce, and in this exagerated state, its super clear that this "flattening" raises the parting line higher actually making a disc MORE OVERSTABLE.
DX type plastic goes farther b/c of surface friction which can help reduce drag and increase lift/glide. Thus dimples.
Oh, and the cheap stuff actually molds much much better...and its cheaper too! (For manufacturors that is)