Thanks to Alain Lambert at MIMF for this!! These are the depths at center for Radius dishes, incase you wish to make your own! The far Left is the arch in feet, the far Right is the center peak measurement.
(ft) (in.) 24 " deflection
05 60 1.2122
10 120 0.6015
12 144 0.5009
15 180 0.4004
20 240 0.3002
25 300 0.2401
30 360 0.2001
35 420 0.1715
40 480 0.1500
45 540 0.1333
50 600 0.1200
55 660 0.1091
60 720 0.1000
65 780 0.0923
70 840 0.0857
75 900 0.0800
80 960 0.0750
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Here is what a Parlor Guitar is for!
http://www.youtube.com/watch?v=oEa8PkjO6_I