for added clarity fig4 shows in an exploded perspective view the flexural joint 16 illustrated in fig1 in one embodiment removable flange portion 34 is a split ring comprising two parts 34a and 34b flange portion 34 is split for ease of installation but it could be a single piece depending upon the application removable flange portion 34 is connected to fixed flange portion 32 by fastening means as for example bolts 36 each bolt 36 extends through matching holes in removable flange portion 34 and fixed flange portion 32 flange member 30 as shown in fig2 includes a recess 38 which is adapted to receive and engage lip 28 recess 38 is bounded in part by a generally forward facing wall 40 of fixed flange portion 32 and a generally aft facing wall 42 of removable flange portion 34 both walls 40 and 42 as well as wall 48 of lip 28 are generally spherical with the center of rotation 43 being located generally along the engine center line put another way walls 40 and 42 and wall 48 are generally contained within concentrically spherical surfaces with center 43 recess 38 engages lip 28 by wall 48 generally contacting wall 42 in a manner to be described more fully hereinafter the axial location of center 43 will determine the curvature of walls 40 and 42 and lip 28 in practice a balance must be struck between large radii which.