Flow patterns were investigated in sinuous curvilinear channels with flexible banks in laboratory tests. In the past, most tests were conducted in stiff banks with rectangular or trapezoidal cross-sections. The research delves into various flow properties, including velocity, Reynolds shear stress, turbulent intensities, turbulent kinetic energy (TKE), and higher-order correlations. Unlike straight flows, the velocity profile in sinuous channels is influenced by secondary flow and doesn't adhere to the typical logarithmic pattern. Notably, velocity changes are more pronounced at the bends’ entry and exit compared to the bend's peak. The presence of helical flow is confirmed by negative Reynolds shear stress at certain bend points. TKE analysis and turbulent intensity measurements reveal that the inner bank of the bend experiences greater effects than the outer bank, a contrast to velocity magnitudes, implying that higher mean speeds don't necessarily equate to more fluctuations. Higher-order correlations indicate both positive and negative signs in the flow and diffusion of streamwise and vertical normal stresses, suggesting sediment movement within the channel. These analyses enhance our comprehension of sinuous channels with flexible banks, a less-studied aspect of fluid dynamics.