Fraser Subsonic Diffuser. Pressure Coefficients. x (m) cp () 1 11 0.1168 -0.017 0.1582 -0.027 0.2106 0.102 0.2365 0.193 0.3000 0.350 0.3813 0.473 0.4384 0.528 0.4684 0.552 0.5227 0.587 0.5776 0.612 0.6421 0.637