Results from an experimental modal analysis on a waterfilled cylindrical shell are compared with a corresponding analytic model solution. The resulting modal parameters are used to determine directional forces from turbulent boundary layer pipe flow excitation. The thin-walled, 24-inch long, aluminum shell has clamped end conditions imposed within a section of a continuous pipe. Mode shapes, damping, in vacuo and water-filled resonance frequencies, and modal masses are evaluated. The three dimensional shell response to all three coordinate excitations is examined and compared. Directional coupling exists for all shell modes except the lowest order (n=0: "breathing") modes. These modes represent a different class of modes from the higher order bending and lobar modes which are coupled in all directions. The lowest order (n=0) circumferential and primarily axial modes can easily be identified in the experimental data, however the lowest order radial modes cannot.