If your elbow is a short radius it is 1 times your nominal pipe diameter. If it is a long radius it is 1 1/2 times your nominal pipe diameter.show me the exact pattern of long radius
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Measure to the center of the Ell and decuct for the threads ..
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this app help you: "Miter Flat Pattern Design" in play.google.com
1.4142 will give you the travel piece C-C then you deduct for the fitting
Short Radius 90 degree elbows are the same as pipe size.... Long Radius 90's are pipe size times 1.5.... so a 6" (SR) elbow is 6"... a 6" (LR) elbow would be 9"