The dimensions in the game manual are incorrect. Corrections were made in the first team update.
Quote:
Team UPDATE - 2013-01-08
The DISCS are Wham-O part number 53214 (custom colored Red, White, or Blue) and have a nominal diameter of 11 in., a nominal height of 1.4 in., and a weight of 180 ± 5 grams.
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Source:
http://frc-manual.usfirst.org/Updates/0
Sorry if my first model has created any issues being that it was based off the wrong dimensions. Here's an updated model with the correct 11 in Diameter and 1.4 in height. Once again, the curvature of the Frisbee is approximate. Use at your own discretion. Hope this clears up any confusion.
Here's the .STEP file (right click and 'Save Link As')
http://dl.dropbox.com/u/99956340/Fri...01.4%20in.STEP