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1-13/16"= The tangent of half the degree X the radius of the elbow.
5 inches
Take Off's are meant for what is the take off of a 10'' 90.that would be 15''.a standard long radius 90 will be one and half times the diameter of the pipe.8'' would be 12''a short radius fitting would be different.the system this is it=1.2.1.2. works well.
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"
From the time the Space Shuttle's on-board computers start the launch sequence until the time the shuttle actually lifts off the pad is about 31 seconds. About 60 seconds after lift off, the engines on the shuttle are at maximum throttle.