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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?

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In reply to Southpaw about the science of overstable and understable. Here's the science behind it in very basic and extremely condensed terms. Now if we can just get some mad scientist to create the ultimate flying disc LOL. 

I was hoping for some lengthy mathmatical equation ;p

LOL. The phenomenon of banking left or right has always baffled me. I guess all discs will bank left when thrown RHBH and will bank right when thrown overhand regardless of the stability rating. This is due to rotation. If I throw an understable disc at full "snap" it will turnover, go right, and hit the ground, but if I throw that same disc at moderate speed with reduced "snap" it will bank left. I understand the theory of center of lift Vs. the center of gravity and how it affects the "degree" of stability 1.0. 1.5, 2.0 etc, but I remain completely baffled on why increased spin causes a disc to bank right. I need to do some more studying LOL.

Yeah, they generally do fly differently.  If you have a favorite mold, buy a new disc of the same mold, same weight, but different plastic, and see how differently they fly.

Discs are made in molds.  Think of a mold like a cake pan.  You take the pan and fill it with ingredients then bake it.  Change the ingredients and you change the cake.  Sometimes small changes in the formula can make big changes in the result.  Like mixing up salt for sugar.

The mold is shot full of melted plastic and then it has to dry into its completed shape.  You have seen brand new discs  of the same type domey or flat or even concave.  Those changes happened while the disc dried and had nothing to do with the mold.

So pump in different plastic formulas and you get different shapes and with them different flight characteristics.  This is why molding a disc is part science, part art and part voodoo. Trying to make consistent discs when tiny changes matter a lot is the biggest challenge in molding and skill and experience of the molding crew make all the difference.  And I mean tiny changes.  Sometimes undetectable to the trained human eye. 

So these differences among plastic types happen for all manufacturers and all discs.  Discraft just tells you.

Thanks for the great answer Mark!  I really like the fact that Discraft tells you.  I have found that my Z Avenger flies straight and fades at the end of the flight while my X Avenger has a slight turn and finishes with just a slight fade.  Overall a very straight flier for me.  I also have noticed that my Ti Stalker is more overstable than my Z but I like that a lot because it flies dead straight into a good headwind.   Same feel of the disc with different purposes.

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