The authors of this contribution have recently proposed new straightforward formulas for the serviceability analysis of non-prismatic timber beams, limiting the validation to pitched, tapered, and kinked beams. The comparison between the new formulas, the ones available in the literature, and highly refined 2D Finite Element analysis have revealed that literature formulas could lead to errors over 100% whereas the new formulas' errors are usually smaller than 10% for most of cases of practical interest. This contribution extends the validation of the new straightforward formulas to more realistic geometries, indicating that the proposed formulas can be applied successfully also to cambered beams. Conversely, the results herein discussed highlight also that the new formulas commit errors over 15% when the curved region is larger than 30% of the beam length and when the maximum boundary slope of curved beams is greater than 30%.