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Separation trajectories were predicted using a CFD-generated aero-grid database and compared to both wind tunnel predictions and flight test trajectories for two external fuel tank geometries. The CFD-based trajectory predictions were found to produce acceptable agreement with wind tunnel and flight test results. Nomenclature= vehicle angle of attack = density = theta, pitch angle about y axis, deg = phi, roll angle about x axis, deg = psi, yaw angle about z axis, deg C L = tank lift coefficient in stability axis system C MY = tank pitching moment about the y-axis C N = tank normal force C Y = tank side force C MZ = tank yawing moment about the z-axis D = tank diameter Rn = Reynolds number based on diameter

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