Fraser Subsonic Diffuser. Shape Factor. x (m) H () 1 11 "x, m" H 0.1168 1.426 0.1582 1.449 0.2106 1.469 0.2365 1.570 0.3 1.708 0.3813 1.945 0.4384 2.225 0.4684 2.257 0.5227 2.586 0.5776 2.755 0.6421 2.970